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import { describe, it, expect } from 'vitest'; import { calculatePercentageChange, formatChange, formatDate, getDateRange, getExpectedCTR } from './gscHelper'; describe('gscHelper utility functions', () => { describe('calculatePercentageChange', () => { it('should calculate positive percentage change correctly', () => { expect(calculatePercentageChange(100, 150)).toBe(50); expect(calculatePercentageChange(200, 300)).toBe(50); }); it('should calculate negative percentage change correctly', () => { expect(calculatePercentageChange(100, 50)).toBe(-50); expect(calculatePercentageChange(100, 75)).toBe(-25); }); it('should return 100 when before is 0 and after is positive', () => { expect(calculatePercentageChange(0, 100)).toBe(100); expect(calculatePercentageChange(0, 50)).toBe(100); }); it('should return 0 when both before and after are 0', () => { expect(calculatePercentageChange(0, 0)).toBe(0); }); it('should handle decimal values', () => { expect(calculatePercentageChange(10, 15)).toBe(50); expect(calculatePercentageChange(0.5, 1)).toBe(100); }); }); describe('formatChange', () => { it('should add plus sign for positive values', () => { expect(formatChange(25)).toBe('+25.0'); expect(formatChange(100.5)).toBe('+100.5'); }); it('should not add plus sign for negative values', () => { expect(formatChange(-25)).toBe('-25.0'); expect(formatChange(-100.5)).toBe('-100.5'); }); it('should add plus sign for zero', () => { expect(formatChange(0)).toBe('+0.0'); }); it('should respect decimals parameter', () => { expect(formatChange(25.123, 2)).toBe('+25.12'); expect(formatChange(-25.123, 0)).toBe('-25'); expect(formatChange(25.5, 3)).toBe('+25.500'); }); }); describe('formatDate', () => { it('should format date as YYYY-MM-DD', () => { const date = new Date('2025-12-30T12:00:00Z'); expect(formatDate(date)).toBe('2025-12-30'); }); it('should handle single digit months and days with padding', () => { const date = new Date('2025-01-05T12:00:00Z'); expect(formatDate(date)).toBe('2025-01-05'); }); it('should handle end of year dates', () => { const date = new Date('2025-12-31T23:59:59Z'); expect(formatDate(date)).toBe('2025-12-31'); }); }); describe('getDateRange', () => { it('should return correct date range for given days', () => { const result = getDateRange(7); expect(result.startDate).toBeDefined(); expect(result.endDate).toBeDefined(); const start = new Date(result.startDate); const end = new Date(result.endDate); const diffDays = Math.round((end.getTime() - start.getTime()) / (1000 * 60 * 60 * 24)); expect(diffDays).toBe(7); }); it('should return dates in YYYY-MM-DD format', () => { const result = getDateRange(28); expect(result.startDate).toMatch(/^\d{4}-\d{2}-\d{2}$/); expect(result.endDate).toMatch(/^\d{4}-\d{2}-\d{2}$/); }); it('should handle 1 day range', () => { const result = getDateRange(1); const start = new Date(result.startDate); const end = new Date(result.endDate); const diffDays = Math.round((end.getTime() - start.getTime()) / (1000 * 60 * 60 * 24)); expect(diffDays).toBe(1); }); it('should handle maximum 540 days range', () => { const result = getDateRange(540); const start = new Date(result.startDate); const end = new Date(result.endDate); const diffDays = Math.round((end.getTime() - start.getTime()) / (1000 * 60 * 60 * 24)); expect(diffDays).toBe(540); }); }); describe('getExpectedCTR', () => { it('should return 30% for position 1', () => { expect(getExpectedCTR(1)).toBe(0.30); }); it('should return 15% for position 2', () => { expect(getExpectedCTR(2)).toBe(0.15); }); it('should return 10% for position 3', () => { expect(getExpectedCTR(3)).toBe(0.10); }); it('should return decreasing CTR for positions 4-10', () => { const ctr4 = getExpectedCTR(4); const ctr5 = getExpectedCTR(5); const ctr10 = getExpectedCTR(10); expect(ctr4).toBeLessThan(getExpectedCTR(3)); expect(ctr5).toBeLessThanOrEqual(ctr4); expect(ctr10).toBeLessThan(ctr5); }); it('should return 1% for positions 11-20', () => { expect(getExpectedCTR(11)).toBe(0.01); expect(getExpectedCTR(15)).toBe(0.01); expect(getExpectedCTR(20)).toBe(0.01); }); it('should return 0.5% for positions beyond 20', () => { expect(getExpectedCTR(21)).toBe(0.005); expect(getExpectedCTR(50)).toBe(0.005); expect(getExpectedCTR(100)).toBe(0.005); }); it('should handle edge cases', () => { expect(getExpectedCTR(0.5)).toBe(0.30); // Should treat as position 1 expect(getExpectedCTR(1.5)).toBe(0.15); // Should treat as position 2 }); }); });