HUMMBL MCP Server

/** * Unit tests for Result utility pattern */ import { describe, it, expect } from "vitest"; import { ok, err, isOk, isErr, type DomainError, Result } from "../types/domain.js"; describe("Result Pattern", () => { describe("ok", () => { it("should create success result", () => { const result = ok(42); expect(result.ok).toBe(true); if (result.ok) { expect(result.value).toBe(42); } }); it("should work with objects", () => { const data = { name: "test" }; const result = ok(data); expect(result.ok).toBe(true); if (result.ok) { expect(result.value).toEqual(data); } }); it("should work with null", () => { const result = ok(null); expect(result.ok).toBe(true); if (result.ok) { expect(result.value).toBeNull(); } }); }); describe("err", () => { it("should create error result", () => { const error: DomainError = { type: "Internal", message: "test error" }; const result = err<DomainError>(error); expect(result.ok).toBe(false); if (!result.ok) { expect(result.error).toEqual(error); } }); it("should work with string errors", () => { const error: DomainError = { type: "Unknown", message: "error message" }; const result = err<DomainError>(error); expect(result.ok).toBe(false); if (!result.ok) { expect(result.error).toEqual(error); } }); }); describe("isOk", () => { it("should return true for success result", () => { const result: Result<number> = ok(42); expect(isOk(result)).toBe(true); }); it("should return false for error result", () => { const result: Result<number> = err<DomainError>({ type: "Internal", message: "test" }); expect(isOk(result)).toBe(false); }); it("should narrow type correctly", () => { const result: Result<number> = ok(42); if (isOk(result)) { const value: number = result.value; expect(value).toBe(42); } }); }); describe("isErr", () => { it("should return true for error result", () => { const result: Result<number> = err<DomainError>({ type: "Internal", message: "test" }); expect(isErr(result)).toBe(true); }); it("should return false for success result", () => { const result: Result<number> = ok(42); expect(isErr(result)).toBe(false); }); it("should narrow type correctly", () => { const result: Result<number> = err<DomainError>({ type: "Internal", message: "test" }); if (isErr(result)) { const error: DomainError = result.error; if (error.type === "Internal") { expect(error.message).toBe("test"); } else { throw new Error("Expected Internal error type for this test"); } } }); }); });