smart-parameters.test.ts•81.2 kB
/**
* Integration Tests: Smart Parameters with Real n8n API
*
* These tests verify that smart parameters (branch='true'/'false', case=N)
* correctly map to n8n's actual connection structure when tested against
* a real n8n instance.
*
* CRITICAL: These tests validate against REAL n8n connection structure:
* ✅ workflow.connections.IF.main[0] (correct)
* ❌ workflow.connections.IF.true (wrong - what unit tests did)
*
* These integration tests would have caught the bugs that unit tests missed:
* - Bug 1: branch='true' mapping to sourceOutput instead of sourceIndex
* - Bug 2: Zod schema stripping branch/case parameters
*/
import { describe, it, expect, beforeEach, afterEach, afterAll } from 'vitest';
import { createTestContext, TestContext, createTestWorkflowName } from '../utils/test-context';
import { getTestN8nClient } from '../utils/n8n-client';
import { N8nApiClient } from '../../../../src/services/n8n-api-client';
import { cleanupOrphanedWorkflows } from '../utils/cleanup-helpers';
import { createMcpContext, getMcpRepository } from '../utils/mcp-context';
import { InstanceContext } from '../../../../src/types/instance-context';
import { NodeRepository } from '../../../../src/database/node-repository';
import { handleUpdatePartialWorkflow } from '../../../../src/mcp/handlers-workflow-diff';
import { Workflow } from '../../../../src/types/n8n-api';
describe('Integration: Smart Parameters with Real n8n API', () => {
let context: TestContext;
let client: N8nApiClient;
let mcpContext: InstanceContext;
let repository: NodeRepository;
beforeEach(async () => {
context = createTestContext();
client = getTestN8nClient();
mcpContext = createMcpContext();
repository = await getMcpRepository();
// Skip workflow validation for these tests - they test n8n API behavior with edge cases
process.env.SKIP_WORKFLOW_VALIDATION = 'true';
});
afterEach(async () => {
await context.cleanup();
// Clean up environment variable
delete process.env.SKIP_WORKFLOW_VALIDATION;
});
afterAll(async () => {
if (!process.env.CI) {
await cleanupOrphanedWorkflows();
}
});
// ======================================================================
// TEST 1: IF node with branch='true'
// ======================================================================
describe('IF Node Smart Parameters', () => {
it('should handle branch="true" with real n8n API', async () => {
// Create minimal workflow with IF node
const workflowName = createTestWorkflowName('Smart Params - IF True Branch');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'if-1',
name: 'IF',
type: 'n8n-nodes-base.if',
typeVersion: 2,
position: [450, 300],
parameters: {
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.value }}',
rightValue: 'test',
operation: 'equal'
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'IF', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Add TrueHandler node and connection using branch='true' smart parameter
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'addNode',
node: {
name: 'TrueHandler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 200],
parameters: {
assignments: {
assignments: [
{
id: 'assign-1',
name: 'handled',
value: 'true',
type: 'string'
}
]
}
}
}
},
{
type: 'addConnection',
source: 'IF',
target: 'TrueHandler',
branch: 'true' // Smart parameter
}
]
},
repository,
mcpContext
);
if (!result.success) console.log("VALIDATION ERROR:", JSON.stringify(result, null, 2));
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL: Assert REAL n8n connection structure
// The connection should be at index 0 of main output array (true branch)
expect(fetchedWorkflow.connections.IF).toBeDefined();
expect(fetchedWorkflow.connections.IF.main).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.IF.main[0][0].node).toBe('TrueHandler');
expect(fetchedWorkflow.connections.IF.main[0][0].type).toBe('main');
// Verify false branch (index 1) is empty or undefined
expect(fetchedWorkflow.connections.IF.main[1] || []).toHaveLength(0);
});
// ======================================================================
// TEST 2: IF node with branch='false'
// ======================================================================
it('should handle branch="false" with real n8n API', async () => {
// Create minimal workflow with IF node
const workflowName = createTestWorkflowName('Smart Params - IF False Branch');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'if-1',
name: 'IF',
type: 'n8n-nodes-base.if',
typeVersion: 2,
position: [450, 300],
parameters: {
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.value }}',
rightValue: 'test',
operation: 'equal'
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'IF', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Add FalseHandler node and connection using branch='false' smart parameter
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'addNode',
node: {
name: 'FalseHandler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 400],
parameters: {
assignments: {
assignments: [
{
id: 'assign-1',
name: 'handled',
value: 'false',
type: 'string'
}
]
}
}
}
},
{
type: 'addConnection',
source: 'IF',
target: 'FalseHandler',
branch: 'false' // Smart parameter
}
]
},
repository,
mcpContext
);
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL: Assert REAL n8n connection structure
// The connection should be at index 1 of main output array (false branch)
expect(fetchedWorkflow.connections.IF).toBeDefined();
expect(fetchedWorkflow.connections.IF.main).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.IF.main[1][0].node).toBe('FalseHandler');
expect(fetchedWorkflow.connections.IF.main[1][0].type).toBe('main');
// Verify true branch (index 0) is empty or undefined
expect(fetchedWorkflow.connections.IF.main[0] || []).toHaveLength(0);
});
// ======================================================================
// TEST 3: IF node with both branches
// ======================================================================
it('should handle both branch="true" and branch="false" simultaneously', async () => {
// Create minimal workflow with IF node
const workflowName = createTestWorkflowName('Smart Params - IF Both Branches');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'if-1',
name: 'IF',
type: 'n8n-nodes-base.if',
typeVersion: 2,
position: [450, 300],
parameters: {
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.value }}',
rightValue: 'test',
operation: 'equal'
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'IF', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Add both handlers and connections in single operation batch
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'addNode',
node: {
name: 'TrueHandler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 200],
parameters: {
assignments: {
assignments: [
{
id: 'assign-1',
name: 'branch',
value: 'true',
type: 'string'
}
]
}
}
}
},
{
type: 'addNode',
node: {
name: 'FalseHandler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 400],
parameters: {
assignments: {
assignments: [
{
id: 'assign-2',
name: 'branch',
value: 'false',
type: 'string'
}
]
}
}
}
},
{
type: 'addConnection',
source: 'IF',
target: 'TrueHandler',
branch: 'true'
},
{
type: 'addConnection',
source: 'IF',
target: 'FalseHandler',
branch: 'false'
}
]
},
repository,
mcpContext
);
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL: Assert both branches exist at separate indices
expect(fetchedWorkflow.connections.IF).toBeDefined();
expect(fetchedWorkflow.connections.IF.main).toBeDefined();
// True branch at index 0
expect(fetchedWorkflow.connections.IF.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.IF.main[0][0].node).toBe('TrueHandler');
// False branch at index 1
expect(fetchedWorkflow.connections.IF.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.IF.main[1][0].node).toBe('FalseHandler');
});
});
// ======================================================================
// TEST 4-6: Switch node with case parameter
// ======================================================================
describe('Switch Node Smart Parameters', () => {
it('should handle case=0, case=1, case=2 with real n8n API', async () => {
// Create minimal workflow with Switch node
const workflowName = createTestWorkflowName('Smart Params - Switch Cases');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'switch-1',
name: 'Switch',
type: 'n8n-nodes-base.switch',
typeVersion: 3,
position: [450, 300],
parameters: {
mode: 'rules',
rules: {
rules: [
{
id: 'rule-1',
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.case }}',
rightValue: 'a',
operation: 'equal'
}
]
},
output: 0
},
{
id: 'rule-2',
conditions: {
conditions: [
{
id: 'cond-2',
leftValue: '={{ $json.case }}',
rightValue: 'b',
operation: 'equal'
}
]
},
output: 1
},
{
id: 'rule-3',
conditions: {
conditions: [
{
id: 'cond-3',
leftValue: '={{ $json.case }}',
rightValue: 'c',
operation: 'equal'
}
]
},
output: 2
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'Switch', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Add 3 handler nodes and connections using case smart parameter
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
// Add handlers
{
type: 'addNode',
node: {
name: 'Handler0',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 100],
parameters: {
assignments: {
assignments: [
{
id: 'assign-1',
name: 'case',
value: '0',
type: 'string'
}
]
}
}
}
},
{
type: 'addNode',
node: {
name: 'Handler1',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 300],
parameters: {
assignments: {
assignments: [
{
id: 'assign-2',
name: 'case',
value: '1',
type: 'string'
}
]
}
}
}
},
{
type: 'addNode',
node: {
name: 'Handler2',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 500],
parameters: {
assignments: {
assignments: [
{
id: 'assign-3',
name: 'case',
value: '2',
type: 'string'
}
]
}
}
}
},
// Add connections with case parameter
{
type: 'addConnection',
source: 'Switch',
target: 'Handler0',
case: 0 // Smart parameter
},
{
type: 'addConnection',
source: 'Switch',
target: 'Handler1',
case: 1 // Smart parameter
},
{
type: 'addConnection',
source: 'Switch',
target: 'Handler2',
case: 2 // Smart parameter
}
]
},
repository,
mcpContext
);
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL: Assert connections at correct indices
expect(fetchedWorkflow.connections.Switch).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main).toBeDefined();
// Case 0 at index 0
expect(fetchedWorkflow.connections.Switch.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[0][0].node).toBe('Handler0');
// Case 1 at index 1
expect(fetchedWorkflow.connections.Switch.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[1][0].node).toBe('Handler1');
// Case 2 at index 2
expect(fetchedWorkflow.connections.Switch.main[2]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[2].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[2][0].node).toBe('Handler2');
});
});
// ======================================================================
// TEST 5: rewireConnection with branch parameter
// ======================================================================
describe('RewireConnection with Smart Parameters', () => {
it('should rewire connection using branch="true" parameter', async () => {
// Create workflow with IF node and initial connection
const workflowName = createTestWorkflowName('Smart Params - Rewire IF True');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'if-1',
name: 'IF',
type: 'n8n-nodes-base.if',
typeVersion: 2,
position: [450, 300],
parameters: {
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.value }}',
rightValue: 'test',
operation: 'equal'
}
]
}
}
},
{
id: 'handler1',
name: 'Handler1',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 200],
parameters: {
assignments: {
assignments: [
{
id: 'assign-1',
name: 'handler',
value: '1',
type: 'string'
}
]
}
}
},
{
id: 'handler2',
name: 'Handler2',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 400],
parameters: {
assignments: {
assignments: [
{
id: 'assign-2',
name: 'handler',
value: '2',
type: 'string'
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'IF', type: 'main', index: 0 }]]
},
IF: {
// Initial connection: true branch to Handler1
main: [[{ node: 'Handler1', type: 'main', index: 0 }], []]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Rewire true branch from Handler1 to Handler2
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'rewireConnection',
source: 'IF',
from: 'Handler1',
to: 'Handler2',
branch: 'true' // Smart parameter
}
]
},
repository,
mcpContext
);
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL: Assert connection rewired at index 0 (true branch)
expect(fetchedWorkflow.connections.IF).toBeDefined();
expect(fetchedWorkflow.connections.IF.main).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.IF.main[0][0].node).toBe('Handler2');
});
// ======================================================================
// TEST 6: rewireConnection with case parameter
// ======================================================================
it('should rewire connection using case=1 parameter', async () => {
// Create workflow with Switch node and initial connections
const workflowName = createTestWorkflowName('Smart Params - Rewire Switch Case');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'switch-1',
name: 'Switch',
type: 'n8n-nodes-base.switch',
typeVersion: 3,
position: [450, 300],
parameters: {
mode: 'rules',
rules: {
rules: [
{
id: 'rule-1',
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.case }}',
rightValue: 'a',
operation: 'equal'
}
]
},
output: 0
},
{
id: 'rule-2',
conditions: {
conditions: [
{
id: 'cond-2',
leftValue: '={{ $json.case }}',
rightValue: 'b',
operation: 'equal'
}
]
},
output: 1
}
]
}
}
},
{
id: 'handler1',
name: 'OldHandler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 300],
parameters: {
assignments: {
assignments: [
{
id: 'assign-1',
name: 'handler',
value: 'old',
type: 'string'
}
]
}
}
},
{
id: 'handler2',
name: 'NewHandler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 500],
parameters: {
assignments: {
assignments: [
{
id: 'assign-2',
name: 'handler',
value: 'new',
type: 'string'
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'Switch', type: 'main', index: 0 }]]
},
Switch: {
// Initial connection: case 1 to OldHandler
main: [[], [{ node: 'OldHandler', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Rewire case 1 from OldHandler to NewHandler
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'rewireConnection',
source: 'Switch',
from: 'OldHandler',
to: 'NewHandler',
case: 1 // Smart parameter
}
]
},
repository,
mcpContext
);
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL: Assert connection rewired at index 1 (case 1)
expect(fetchedWorkflow.connections.Switch).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[1][0].node).toBe('NewHandler');
});
});
// ======================================================================
// TEST 7: Explicit sourceIndex overrides branch
// ======================================================================
describe('Parameter Priority', () => {
it('should prioritize explicit sourceIndex over branch parameter', async () => {
// Create minimal workflow with IF node
const workflowName = createTestWorkflowName('Smart Params - Explicit Override Branch');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'if-1',
name: 'IF',
type: 'n8n-nodes-base.if',
typeVersion: 2,
position: [450, 300],
parameters: {
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.value }}',
rightValue: 'test',
operation: 'equal'
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'IF', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Add connection with BOTH branch='true' (would be index 0) and explicit sourceIndex=1
// Explicit sourceIndex should win
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'addNode',
node: {
name: 'Handler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 400],
parameters: {
assignments: {
assignments: [
{
id: 'assign-1',
name: 'test',
value: 'value',
type: 'string'
}
]
}
}
}
},
{
type: 'addConnection',
source: 'IF',
target: 'Handler',
branch: 'true', // Would map to index 0
sourceIndex: 1 // Explicit index should override
}
]
},
repository,
mcpContext
);
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL: Assert connection is at index 1 (explicit wins)
expect(fetchedWorkflow.connections.IF).toBeDefined();
expect(fetchedWorkflow.connections.IF.main).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.IF.main[1][0].node).toBe('Handler');
// Index 0 should be empty
expect(fetchedWorkflow.connections.IF.main[0] || []).toHaveLength(0);
});
// ======================================================================
// TEST 8: Explicit sourceIndex overrides case
// ======================================================================
it('should prioritize explicit sourceIndex over case parameter', async () => {
// Create minimal workflow with Switch node
const workflowName = createTestWorkflowName('Smart Params - Explicit Override Case');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'switch-1',
name: 'Switch',
type: 'n8n-nodes-base.switch',
typeVersion: 3,
position: [450, 300],
parameters: {
mode: 'rules',
rules: {
rules: [
{
id: 'rule-1',
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.case }}',
rightValue: 'a',
operation: 'equal'
}
]
},
output: 0
},
{
id: 'rule-2',
conditions: {
conditions: [
{
id: 'cond-2',
leftValue: '={{ $json.case }}',
rightValue: 'b',
operation: 'equal'
}
]
},
output: 1
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'Switch', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Add connection with BOTH case=1 (would be index 1) and explicit sourceIndex=2
// Explicit sourceIndex should win
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'addNode',
node: {
name: 'Handler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 500],
parameters: {
assignments: {
assignments: [
{
id: 'assign-1',
name: 'test',
value: 'value',
type: 'string'
}
]
}
}
}
},
{
type: 'addConnection',
source: 'Switch',
target: 'Handler',
case: 1, // Would map to index 1
sourceIndex: 2 // Explicit index should override
}
]
},
repository,
mcpContext
);
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL: Assert connection is at index 2 (explicit wins)
expect(fetchedWorkflow.connections.Switch).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[2]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[2].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[2][0].node).toBe('Handler');
// Index 1 should be empty
expect(fetchedWorkflow.connections.Switch.main[1] || []).toHaveLength(0);
});
});
// ======================================================================
// ERROR CASES: Invalid smart parameter values
// ======================================================================
describe('Error Cases', () => {
it('should reject invalid branch value', async () => {
// Create minimal workflow with IF node
const workflowName = createTestWorkflowName('Smart Params - Invalid Branch');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'if-1',
name: 'IF',
type: 'n8n-nodes-base.if',
typeVersion: 2,
position: [450, 300],
parameters: {
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.value }}',
rightValue: 'test',
operation: 'equal'
}
]
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'IF', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Try to add connection with invalid branch value
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'addNode',
node: {
name: 'Handler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 300],
parameters: {
assignments: {
assignments: []
}
}
}
},
{
type: 'addConnection',
source: 'IF',
target: 'Handler',
branch: 'invalid' as any // Invalid value
}
]
},
repository,
mcpContext
);
// Should fail validation
expect(result.success).toBe(false);
expect(result.error).toBeDefined();
});
it('should handle negative case value gracefully', async () => {
// NOTE: Currently negative case values are accepted and mapped to sourceIndex=-1
// which n8n API accepts (though it may not behave correctly at runtime).
// TODO: Add validation to reject negative case values in future enhancement.
// Create minimal workflow with Switch node
const workflowName = createTestWorkflowName('Smart Params - Negative Case');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'switch-1',
name: 'Switch',
type: 'n8n-nodes-base.switch',
typeVersion: 3,
position: [450, 300],
parameters: {
mode: 'rules',
rules: {
rules: []
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'Switch', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Add connection with negative case value
// Currently accepted but should be validated in future
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'addNode',
node: {
name: 'Handler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 300],
parameters: {
assignments: {
assignments: []
}
}
}
},
{
type: 'addConnection',
source: 'Switch',
target: 'Handler',
case: -1 // Negative value - should be validated but currently accepted
}
]
},
repository,
mcpContext
);
// Currently succeeds (validation gap)
// TODO: Should fail validation when enhanced validation is added
expect(result.success).toBe(true);
});
});
// ======================================================================
// EDGE CASES: Branch parameter on non-IF node
// ======================================================================
describe('Edge Cases', () => {
it('should ignore branch parameter on non-IF node (fallback to default)', async () => {
// Create workflow with Set node (not an IF node)
const workflowName = createTestWorkflowName('Smart Params - Branch on Non-IF');
const workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: 'manual-1',
name: 'Manual',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [250, 300],
parameters: {}
},
{
id: 'set-1',
name: 'Set',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [450, 300],
parameters: {
assignments: {
assignments: []
}
}
}
],
connections: {
Manual: {
main: [[{ node: 'Set', type: 'main', index: 0 }]]
}
},
tags: ['mcp-integration-test']
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Add connection with branch parameter on non-IF node
// Should be ignored and use default index 0
const result = await handleUpdatePartialWorkflow(
{
id: workflow.id,
operations: [
{
type: 'addNode',
node: {
name: 'Handler',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [650, 300],
parameters: {
assignments: {
assignments: []
}
}
}
},
{
type: 'addConnection',
source: 'Set',
target: 'Handler',
branch: 'true' // Should be ignored on non-IF node
}
]
},
repository,
mcpContext
);
expect(result.success).toBe(true);
// Fetch actual workflow from n8n API
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// Connection should be at default index 0 (branch parameter ignored)
expect(fetchedWorkflow.connections.Set).toBeDefined();
expect(fetchedWorkflow.connections.Set.main).toBeDefined();
expect(fetchedWorkflow.connections.Set.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.Set.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.Set.main[0][0].node).toBe('Handler');
});
});
// ======================================================================
// TEST 11: Array Index Preservation (Issue #272 - Critical Bug Fix)
// ======================================================================
describe('Array Index Preservation for Multi-Output Nodes', () => {
it('should preserve array indices when rewiring Switch node connections', async () => {
// This test verifies the fix for the critical bug where filtering empty arrays
// caused index shifting in multi-output nodes (Switch, IF with multiple handlers)
//
// Bug: workflow.connections[node][output].filter(conns => conns.length > 0)
// Fix: Only remove trailing empty arrays, preserve intermediate ones
const workflowName = createTestWorkflowName('Array Index Preservation - Switch');
// Create workflow with Switch node connected to 4 handlers
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Start',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [0, 0],
parameters: {}
},
{
id: '2',
name: 'Switch',
type: 'n8n-nodes-base.switch',
typeVersion: 3,
position: [200, 0],
parameters: {
options: {},
rules: {
rules: [
{ conditions: { conditions: [{ leftValue: '={{$json.value}}', rightValue: '1', operator: { type: 'string', operation: 'equals' } }] } },
{ conditions: { conditions: [{ leftValue: '={{$json.value}}', rightValue: '2', operator: { type: 'string', operation: 'equals' } }] } },
{ conditions: { conditions: [{ leftValue: '={{$json.value}}', rightValue: '3', operator: { type: 'string', operation: 'equals' } }] } }
]
}
}
},
{
id: '3',
name: 'Handler0',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, -100],
parameters: {}
},
{
id: '4',
name: 'Handler1',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 0],
parameters: {}
},
{
id: '5',
name: 'Handler2',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 100],
parameters: {}
},
{
id: '6',
name: 'Handler3',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 200],
parameters: {}
},
{
id: '7',
name: 'NewHandler1',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 50],
parameters: {}
}
],
connections: {
Start: {
main: [[{ node: 'Switch', type: 'main', index: 0 }]]
},
Switch: {
main: [
[{ node: 'Handler0', type: 'main', index: 0 }], // case 0
[{ node: 'Handler1', type: 'main', index: 0 }], // case 1
[{ node: 'Handler2', type: 'main', index: 0 }], // case 2
[{ node: 'Handler3', type: 'main', index: 0 }] // case 3 (fallback)
]
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Rewire case 1 from Handler1 to NewHandler1
// CRITICAL: This should NOT shift indices of case 2 and case 3
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'rewireConnection',
source: 'Switch',
from: 'Handler1',
to: 'NewHandler1',
case: 1
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// Verify all indices are preserved correctly
expect(fetchedWorkflow.connections.Switch).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main).toBeDefined();
// case 0: Should still be Handler0
expect(fetchedWorkflow.connections.Switch.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[0][0].node).toBe('Handler0');
// case 1: Should now be NewHandler1 (rewired)
expect(fetchedWorkflow.connections.Switch.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[1][0].node).toBe('NewHandler1');
// case 2: Should STILL be Handler2 (index NOT shifted!)
expect(fetchedWorkflow.connections.Switch.main[2]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[2].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[2][0].node).toBe('Handler2');
// case 3: Should STILL be Handler3 (index NOT shifted!)
expect(fetchedWorkflow.connections.Switch.main[3]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[3].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[3][0].node).toBe('Handler3');
});
it('should preserve empty arrays when removing IF node connections', async () => {
// This test verifies that removing a connection creates an empty array
// rather than shifting indices (which would break the true/false semantics)
const workflowName = createTestWorkflowName('Array Preservation - IF Remove');
// Create workflow with IF node connected to both branches
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Start',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [0, 0],
parameters: {}
},
{
id: '2',
name: 'IF',
type: 'n8n-nodes-base.if',
typeVersion: 2,
position: [200, 0],
parameters: {
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.value }}',
rightValue: 'test',
operation: 'equal'
}
]
}
}
},
{
id: '3',
name: 'TrueHandler',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, -50],
parameters: {}
},
{
id: '4',
name: 'FalseHandler',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 50],
parameters: {}
}
],
connections: {
Start: {
main: [[{ node: 'IF', type: 'main', index: 0 }]]
},
IF: {
main: [
[{ node: 'TrueHandler', type: 'main', index: 0 }], // true branch (index 0)
[{ node: 'FalseHandler', type: 'main', index: 0 }] // false branch (index 1)
]
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Remove connection from true branch (index 0)
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'removeConnection',
source: 'IF',
target: 'TrueHandler',
branch: 'true'
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// Verify structure: empty array at index 0, FalseHandler still at index 1
expect(fetchedWorkflow.connections.IF).toBeDefined();
expect(fetchedWorkflow.connections.IF.main).toBeDefined();
expect(fetchedWorkflow.connections.IF.main.length).toBe(2);
// Index 0 (true branch): Should be empty array (NOT removed!)
expect(fetchedWorkflow.connections.IF.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[0].length).toBe(0);
// Index 1 (false branch): Should STILL be FalseHandler (NOT shifted to index 0!)
expect(fetchedWorkflow.connections.IF.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.IF.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.IF.main[1][0].node).toBe('FalseHandler');
});
it('should preserve indices when removing first case from Switch node', async () => {
// MOST CRITICAL TEST: Verifies removing first output doesn't shift all others
// This is the exact bug scenario that was production-breaking
const workflowName = createTestWorkflowName('Array Preservation - Switch Remove First');
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Start',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [0, 0],
parameters: {}
},
{
id: '2',
name: 'Switch',
type: 'n8n-nodes-base.switch',
typeVersion: 3,
position: [200, 0],
parameters: {
options: {},
rules: {
rules: [
{ conditions: { conditions: [{ leftValue: '={{$json.case}}', rightValue: '0', operator: { type: 'string', operation: 'equals' } }] } },
{ conditions: { conditions: [{ leftValue: '={{$json.case}}', rightValue: '1', operator: { type: 'string', operation: 'equals' } }] } },
{ conditions: { conditions: [{ leftValue: '={{$json.case}}', rightValue: '2', operator: { type: 'string', operation: 'equals' } }] } }
]
}
}
},
{
id: '3',
name: 'Handler0',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, -100],
parameters: {}
},
{
id: '4',
name: 'Handler1',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 0],
parameters: {}
},
{
id: '5',
name: 'Handler2',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 100],
parameters: {}
},
{
id: '6',
name: 'FallbackHandler',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 200],
parameters: {}
}
],
connections: {
Start: {
main: [[{ node: 'Switch', type: 'main', index: 0 }]]
},
Switch: {
main: [
[{ node: 'Handler0', type: 'main', index: 0 }], // case 0
[{ node: 'Handler1', type: 'main', index: 0 }], // case 1
[{ node: 'Handler2', type: 'main', index: 0 }], // case 2
[{ node: 'FallbackHandler', type: 'main', index: 0 }] // fallback (case 3)
]
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Remove connection from case 0 (first output)
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'removeConnection',
source: 'Switch',
target: 'Handler0',
case: 0
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
expect(fetchedWorkflow.connections.Switch).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main.length).toBe(4);
// case 0: Should be empty array (NOT removed!)
expect(fetchedWorkflow.connections.Switch.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[0].length).toBe(0);
// case 1: Should STILL be Handler1 at index 1 (NOT shifted to 0!)
expect(fetchedWorkflow.connections.Switch.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[1][0].node).toBe('Handler1');
// case 2: Should STILL be Handler2 at index 2 (NOT shifted to 1!)
expect(fetchedWorkflow.connections.Switch.main[2]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[2].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[2][0].node).toBe('Handler2');
// case 3: Should STILL be FallbackHandler at index 3 (NOT shifted to 2!)
expect(fetchedWorkflow.connections.Switch.main[3]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[3].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[3][0].node).toBe('FallbackHandler');
});
it('should preserve indices through sequential operations on Switch node', async () => {
// Complex scenario: Multiple operations in sequence on the same Switch node
// This tests that our fix works correctly across multiple operations
const workflowName = createTestWorkflowName('Array Preservation - Sequential Ops');
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Start',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [0, 0],
parameters: {}
},
{
id: '2',
name: 'Switch',
type: 'n8n-nodes-base.switch',
typeVersion: 3,
position: [200, 0],
parameters: {
options: {},
rules: {
rules: [
{ conditions: { conditions: [{ leftValue: '={{$json.value}}', rightValue: '1', operator: { type: 'string', operation: 'equals' } }] } },
{ conditions: { conditions: [{ leftValue: '={{$json.value}}', rightValue: '2', operator: { type: 'string', operation: 'equals' } }] } }
]
}
}
},
{
id: '3',
name: 'Handler0',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, -50],
parameters: {}
},
{
id: '4',
name: 'Handler1',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 50],
parameters: {}
},
{
id: '5',
name: 'NewHandler0',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, -100],
parameters: {}
},
{
id: '6',
name: 'NewHandler2',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 150],
parameters: {}
}
],
connections: {
Start: {
main: [[{ node: 'Switch', type: 'main', index: 0 }]]
},
Switch: {
main: [
[{ node: 'Handler0', type: 'main', index: 0 }], // case 0
[{ node: 'Handler1', type: 'main', index: 0 }] // case 1
]
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Sequential operations:
// 1. Rewire case 0: Handler0 → NewHandler0
// 2. Add connection to case 2 (new handler)
// 3. Remove connection from case 1 (Handler1)
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'rewireConnection',
source: 'Switch',
from: 'Handler0',
to: 'NewHandler0',
case: 0
},
{
type: 'addConnection',
source: 'Switch',
target: 'NewHandler2',
case: 2
},
{
type: 'removeConnection',
source: 'Switch',
target: 'Handler1',
case: 1
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
expect(fetchedWorkflow.connections.Switch).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main.length).toBe(3);
// case 0: Should be NewHandler0 (rewired)
expect(fetchedWorkflow.connections.Switch.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[0][0].node).toBe('NewHandler0');
// case 1: Should be empty array (removed)
expect(fetchedWorkflow.connections.Switch.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[1].length).toBe(0);
// case 2: Should be NewHandler2 (added)
expect(fetchedWorkflow.connections.Switch.main[2]).toBeDefined();
expect(fetchedWorkflow.connections.Switch.main[2].length).toBe(1);
expect(fetchedWorkflow.connections.Switch.main[2][0].node).toBe('NewHandler2');
});
it('should preserve indices when rewiring Filter node connections', async () => {
// Filter node has 2 outputs: kept items (index 0) and discarded items (index 1)
// Test that rewiring one doesn't affect the other
const workflowName = createTestWorkflowName('Array Preservation - Filter');
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Start',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [0, 0],
parameters: {}
},
{
id: '2',
name: 'Filter',
type: 'n8n-nodes-base.filter',
typeVersion: 2,
position: [200, 0],
parameters: {
conditions: {
conditions: [
{
id: 'cond-1',
leftValue: '={{ $json.value }}',
rightValue: 10,
operator: { type: 'number', operation: 'gt' }
}
]
}
}
},
{
id: '3',
name: 'KeptHandler',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, -50],
parameters: {}
},
{
id: '4',
name: 'DiscardedHandler',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, 50],
parameters: {}
},
{
id: '5',
name: 'NewKeptHandler',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [400, -100],
parameters: {}
}
],
connections: {
Start: {
main: [[{ node: 'Filter', type: 'main', index: 0 }]]
},
Filter: {
main: [
[{ node: 'KeptHandler', type: 'main', index: 0 }], // kept items (index 0)
[{ node: 'DiscardedHandler', type: 'main', index: 0 }] // discarded items (index 1)
]
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Rewire kept items output (index 0) from KeptHandler to NewKeptHandler
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'rewireConnection',
source: 'Filter',
from: 'KeptHandler',
to: 'NewKeptHandler',
sourceIndex: 0
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
expect(fetchedWorkflow.connections.Filter).toBeDefined();
expect(fetchedWorkflow.connections.Filter.main).toBeDefined();
expect(fetchedWorkflow.connections.Filter.main.length).toBe(2);
// Index 0 (kept items): Should now be NewKeptHandler
expect(fetchedWorkflow.connections.Filter.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.Filter.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.Filter.main[0][0].node).toBe('NewKeptHandler');
// Index 1 (discarded items): Should STILL be DiscardedHandler (unchanged)
expect(fetchedWorkflow.connections.Filter.main[1]).toBeDefined();
expect(fetchedWorkflow.connections.Filter.main[1].length).toBe(1);
expect(fetchedWorkflow.connections.Filter.main[1][0].node).toBe('DiscardedHandler');
});
});
// ======================================================================
// TEST 16-19: Merge Node - Multiple Inputs (targetIndex preservation)
// ======================================================================
describe('Merge Node - Multiple Inputs (targetIndex Preservation)', () => {
it('should preserve targetIndex when removing connection to Merge input 0', async () => {
// CRITICAL: Merge has multiple INPUTS (unlike Switch which has multiple outputs)
// This tests that targetIndex preservation works for incoming connections
// Bug would cause: Remove input 0 → input 1 shifts to input 0
const workflowName = createTestWorkflowName('Merge - Remove Input 0');
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Start',
type: 'n8n-nodes-base.manualTrigger',
typeVersion: 1,
position: [0, 0],
parameters: {}
},
{
id: '2',
name: 'Source1',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [200, -50],
parameters: {
assignments: {
assignments: [
{ id: 'a1', name: 'source', value: '1', type: 'string' }
]
}
}
},
{
id: '3',
name: 'Source2',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [200, 50],
parameters: {
assignments: {
assignments: [
{ id: 'a2', name: 'source', value: '2', type: 'string' }
]
}
}
},
{
id: '4',
name: 'Merge',
type: 'n8n-nodes-base.merge',
typeVersion: 3,
position: [400, 0],
parameters: {
mode: 'append'
}
},
{
id: '5',
name: 'Output',
type: 'n8n-nodes-base.noOp',
typeVersion: 1,
position: [600, 0],
parameters: {}
}
],
connections: {
Start: {
main: [[{ node: 'Source1', type: 'main', index: 0 }]]
},
Source1: {
main: [[{ node: 'Merge', type: 'main', index: 0 }]] // to Merge input 0
},
Source2: {
main: [[{ node: 'Merge', type: 'main', index: 1 }]] // to Merge input 1
},
Merge: {
main: [[{ node: 'Output', type: 'main', index: 0 }]]
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Remove connection from Source1 to Merge (input 0)
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'removeConnection',
source: 'Source1',
target: 'Merge'
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// CRITICAL VERIFICATION: Source2 should STILL connect to Merge at targetIndex 1
// Bug would cause it to shift to targetIndex 0
expect(fetchedWorkflow.connections.Source2).toBeDefined();
expect(fetchedWorkflow.connections.Source2.main).toBeDefined();
expect(fetchedWorkflow.connections.Source2.main[0]).toBeDefined();
expect(fetchedWorkflow.connections.Source2.main[0].length).toBe(1);
expect(fetchedWorkflow.connections.Source2.main[0][0].node).toBe('Merge');
expect(fetchedWorkflow.connections.Source2.main[0][0].index).toBe(1); // STILL index 1!
// Source1 should no longer connect to Merge
expect(fetchedWorkflow.connections.Source1).toBeUndefined();
});
it('should preserve targetIndex when removing middle connection to Merge', async () => {
// MOST CRITICAL: Remove middle input, verify inputs 0 and 2 stay at their indices
// This is the multi-input equivalent of the Switch node bug
const workflowName = createTestWorkflowName('Merge - Remove Middle Input');
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Source0',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, -100],
parameters: {
assignments: {
assignments: [
{ id: 'a0', name: 'source', value: '0', type: 'string' }
]
}
}
},
{
id: '2',
name: 'Source1',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, 0],
parameters: {
assignments: {
assignments: [
{ id: 'a1', name: 'source', value: '1', type: 'string' }
]
}
}
},
{
id: '3',
name: 'Source2',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, 100],
parameters: {
assignments: {
assignments: [
{ id: 'a2', name: 'source', value: '2', type: 'string' }
]
}
}
},
{
id: '4',
name: 'Merge',
type: 'n8n-nodes-base.merge',
typeVersion: 3,
position: [200, 0],
parameters: {
mode: 'append'
}
}
],
connections: {
Source0: {
main: [[{ node: 'Merge', type: 'main', index: 0 }]] // input 0
},
Source1: {
main: [[{ node: 'Merge', type: 'main', index: 1 }]] // input 1
},
Source2: {
main: [[{ node: 'Merge', type: 'main', index: 2 }]] // input 2
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Remove connection from Source1 to Merge (middle input)
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'removeConnection',
source: 'Source1',
target: 'Merge'
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// Source0 should STILL connect to Merge at targetIndex 0
expect(fetchedWorkflow.connections.Source0).toBeDefined();
expect(fetchedWorkflow.connections.Source0.main[0][0].node).toBe('Merge');
expect(fetchedWorkflow.connections.Source0.main[0][0].index).toBe(0); // STILL 0!
// Source2 should STILL connect to Merge at targetIndex 2 (NOT shifted to 1!)
expect(fetchedWorkflow.connections.Source2).toBeDefined();
expect(fetchedWorkflow.connections.Source2.main[0][0].node).toBe('Merge');
expect(fetchedWorkflow.connections.Source2.main[0][0].index).toBe(2); // STILL 2!
// Source1 should no longer connect to Merge
expect(fetchedWorkflow.connections.Source1).toBeUndefined();
});
it('should handle replacing source connection to Merge input', async () => {
// Test replacing which node connects to a Merge input
// Use remove + add pattern (not rewireConnection which changes target, not source)
const workflowName = createTestWorkflowName('Merge - Replace Source');
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Source1',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, -50],
parameters: {
assignments: {
assignments: [
{ id: 'a1', name: 'source', value: '1', type: 'string' }
]
}
}
},
{
id: '2',
name: 'Source2',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, 50],
parameters: {
assignments: {
assignments: [
{ id: 'a2', name: 'source', value: '2', type: 'string' }
]
}
}
},
{
id: '3',
name: 'NewSource1',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, -100],
parameters: {
assignments: {
assignments: [
{ id: 'a3', name: 'source', value: 'new1', type: 'string' }
]
}
}
},
{
id: '4',
name: 'Merge',
type: 'n8n-nodes-base.merge',
typeVersion: 3,
position: [200, 0],
parameters: {
mode: 'append'
}
}
],
connections: {
Source1: {
main: [[{ node: 'Merge', type: 'main', index: 0 }]]
},
Source2: {
main: [[{ node: 'Merge', type: 'main', index: 1 }]]
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Replace Source1 with NewSource1 (both to Merge input 0)
// Use remove + add pattern
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'removeConnection',
source: 'Source1',
target: 'Merge'
},
{
type: 'addConnection',
source: 'NewSource1',
target: 'Merge',
targetInput: 'main',
targetIndex: 0
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// NewSource1 should now connect to Merge at input 0
expect(fetchedWorkflow.connections.NewSource1).toBeDefined();
expect(fetchedWorkflow.connections.NewSource1.main[0][0].node).toBe('Merge');
expect(fetchedWorkflow.connections.NewSource1.main[0][0].index).toBe(0);
// Source2 should STILL connect to Merge at input 1 (unchanged)
expect(fetchedWorkflow.connections.Source2).toBeDefined();
expect(fetchedWorkflow.connections.Source2.main[0][0].node).toBe('Merge');
expect(fetchedWorkflow.connections.Source2.main[0][0].index).toBe(1);
// Source1 should no longer connect to Merge
expect(fetchedWorkflow.connections.Source1).toBeUndefined();
});
it('should preserve indices through sequential operations on Merge inputs', async () => {
// Complex scenario: Multiple operations on Merge inputs in sequence
const workflowName = createTestWorkflowName('Merge - Sequential Ops');
const workflow: Workflow = await client.createWorkflow({
name: workflowName,
nodes: [
{
id: '1',
name: 'Source1',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, -50],
parameters: {
assignments: {
assignments: [
{ id: 'a1', name: 'source', value: '1', type: 'string' }
]
}
}
},
{
id: '2',
name: 'Source2',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, 50],
parameters: {
assignments: {
assignments: [
{ id: 'a2', name: 'source', value: '2', type: 'string' }
]
}
}
},
{
id: '3',
name: 'NewSource1',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, -100],
parameters: {
assignments: {
assignments: [
{ id: 'a3', name: 'source', value: 'new1', type: 'string' }
]
}
}
},
{
id: '4',
name: 'Source3',
type: 'n8n-nodes-base.set',
typeVersion: 3.4,
position: [0, 150],
parameters: {
assignments: {
assignments: [
{ id: 'a4', name: 'source', value: '3', type: 'string' }
]
}
}
},
{
id: '5',
name: 'Merge',
type: 'n8n-nodes-base.merge',
typeVersion: 3,
position: [200, 0],
parameters: {
mode: 'append'
}
}
],
connections: {
Source1: {
main: [[{ node: 'Merge', type: 'main', index: 0 }]]
},
Source2: {
main: [[{ node: 'Merge', type: 'main', index: 1 }]]
}
}
});
expect(workflow.id).toBeTruthy();
if (!workflow.id) throw new Error('Workflow ID is missing');
context.trackWorkflow(workflow.id);
// Sequential operations:
// 1. Replace input 0: Source1 → NewSource1 (remove + add)
// 2. Add Source3 → Merge input 2
// 3. Remove connection from Source2 (input 1)
await handleUpdatePartialWorkflow({
id: workflow.id,
operations: [
{
type: 'removeConnection',
source: 'Source1',
target: 'Merge'
},
{
type: 'addConnection',
source: 'NewSource1',
target: 'Merge',
targetInput: 'main',
targetIndex: 0
},
{
type: 'addConnection',
source: 'Source3',
target: 'Merge',
targetInput: 'main',
targetIndex: 2
},
{
type: 'removeConnection',
source: 'Source2',
target: 'Merge'
}
]
}, repository);
const fetchedWorkflow = await client.getWorkflow(workflow.id);
// NewSource1 should connect to Merge at input 0 (rewired)
expect(fetchedWorkflow.connections.NewSource1).toBeDefined();
expect(fetchedWorkflow.connections.NewSource1.main[0][0].node).toBe('Merge');
expect(fetchedWorkflow.connections.NewSource1.main[0][0].index).toBe(0);
// Source2 removed, should not exist
expect(fetchedWorkflow.connections.Source2).toBeUndefined();
// Source3 should connect to Merge at input 2 (NOT shifted to 1!)
expect(fetchedWorkflow.connections.Source3).toBeDefined();
expect(fetchedWorkflow.connections.Source3.main[0][0].node).toBe('Merge');
expect(fetchedWorkflow.connections.Source3.main[0][0].index).toBe(2);
});
});
});