import { describe, it, expect } from 'vitest';
import { jsonToCsv } from '../src/common/utils/csv.js';
describe('jsonToCsv', () => {
it('returns empty string for empty input', () => {
expect(jsonToCsv([])).toBe('');
});
it('handles simple flat objects', () => {
const data = [
{ id: 1, name: 'Alice' },
{ id: 2, name: 'Bob' }
];
const expected = "id,name\n1,Alice\n2,Bob";
expect(jsonToCsv(data)).toBe(expected);
});
it('handles missing values', () => {
const data = [
{ id: 1, name: 'Alice' },
{ id: 2, name: null }
];
// Note: Object keys order is not guaranteed in JS, but usually consistent for insertion order.
// Assuming 'id', 'name' order.
// If keys order is different, we can adjust the test.
// However, usually V8 preserves insertion order for string keys.
// Let's ensure consistent order by defining keys explicitly if needed, but jsonToCsv uses Object.keys(data[0]).
// If data[0] has id then name, it uses that order.
const result = jsonToCsv(data);
const expected = "id,name\n1,Alice\n2,";
expect(result).toBe(expected);
});
it('handles special characters (commas, quotes, newlines)', () => {
const data = [
{ id: 1, text: 'Hello, world' },
{ id: 2, text: 'She said "Hi"' },
{ id: 3, text: 'Line 1\nLine 2' }
];
const result = jsonToCsv(data);
const expected = `id,text
1,"Hello, world"
2,"She said ""Hi"""
3,"Line 1\nLine 2"`;
expect(result).toBe(expected);
});
it('handles undefined values', () => {
const data = [
{ a: 1, b: undefined },
{ a: 2, b: 3 }
];
// If first row has undefined value, it still has the key if explicitly set to undefined.
// But if key is missing, Object.keys won't pick it up.
// If data[0] has keys 'a' and 'b', then headers are 'a','b'.
const result = jsonToCsv(data);
const expected = "a,b\n1,\n2,3";
expect(result).toBe(expected);
});
});
