// @ts-nocheck
/**
* Tests for APCA support in check-contrast tool
*/
import {
checkContrast,
CheckContrastParams,
} from '../../src/tools/check-contrast';
import { ToolResponse, ErrorResponse } from '../../src/types/index';
describe('checkContrast with APCA support', () => {
describe('APCA Standard', () => {
test('should calculate APCA score for light text on dark background', async () => {
const params: CheckContrastParams = {
foreground: '#FFFFFF',
background: '#000000',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.standard).toBe('APCA');
expect(result.data.apca_score).toBeDefined();
expect(typeof result.data.apca_score).toBe('number');
expect(result.data.compliance.apca_passes).toBeDefined();
// White on black should have high APCA score
expect(Math.abs(result.data.apca_score!)).toBeGreaterThan(75);
expect(result.data.compliance.apca_passes).toBe(true);
}
});
test('should calculate APCA score for dark text on light background', async () => {
const params: CheckContrastParams = {
foreground: '#000000',
background: '#FFFFFF',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.apca_score).toBeDefined();
expect(typeof result.data.apca_score).toBe('number');
// Black on white should have high APCA score (negative value)
expect(Math.abs(result.data.apca_score!)).toBeGreaterThan(75);
expect(result.data.compliance.apca_passes).toBe(true);
}
});
test('should handle low contrast combinations with APCA', async () => {
const params: CheckContrastParams = {
foreground: '#888888',
background: '#999999',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.apca_score).toBeDefined();
// Low contrast should have low APCA score
expect(Math.abs(result.data.apca_score!)).toBeLessThan(30);
expect(result.data.compliance.apca_passes).toBe(false);
}
});
test('should respect text size for APCA thresholds', async () => {
const params: CheckContrastParams = {
foreground: '#666666',
background: '#FFFFFF',
text_size: 'large',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.text_size).toBe('large');
expect(result.data.apca_score).toBeDefined();
// Large text has lower APCA threshold (60 vs 75)
// This combination might pass for large text but not normal text
}
});
test('should include APCA scores in alternative combinations', async () => {
const params: CheckContrastParams = {
foreground: '#CCCCCC',
background: '#DDDDDD',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success && result.data.alternative_combinations) {
// Check that alternatives include APCA scores
result.data.alternative_combinations.foreground_adjustments.forEach(
adjustment => {
expect(adjustment.apca_score).toBeDefined();
expect(typeof adjustment.apca_score).toBe('number');
}
);
result.data.alternative_combinations.background_adjustments.forEach(
adjustment => {
expect(adjustment.apca_score).toBeDefined();
expect(typeof adjustment.apca_score).toBe('number');
}
);
}
});
});
describe('WCAG vs APCA Comparison', () => {
test('should show different results between WCAG and APCA for same colors', async () => {
const colors = {
foreground: '#767676',
background: '#FFFFFF',
};
// Test with WCAG_AA
const wcagResult = await checkContrast({
...colors,
standard: 'WCAG_AA',
});
// Test with APCA
const apcaResult = await checkContrast({
...colors,
standard: 'APCA',
});
expect(wcagResult.success).toBe(true);
expect(apcaResult.success).toBe(true);
if (wcagResult.success && apcaResult.success) {
// Both should have contrast ratio
expect(wcagResult.data.contrast_ratio).toBeDefined();
expect(apcaResult.data.contrast_ratio).toBeDefined();
// Only APCA should have APCA score
expect(wcagResult.data.apca_score).toBeUndefined();
expect(apcaResult.data.apca_score).toBeDefined();
// Compliance might differ between standards
expect(wcagResult.data.compliance.passes).toBeDefined();
expect(apcaResult.data.compliance.passes).toBeDefined();
}
});
test('should maintain WCAG calculations when using APCA', async () => {
const params: CheckContrastParams = {
foreground: '#000000',
background: '#FFFFFF',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
// WCAG values should still be calculated
expect(result.data.contrast_ratio).toBeDefined();
expect(result.data.compliance.wcag_aa).toBeDefined();
expect(result.data.compliance.wcag_aaa).toBeDefined();
// APCA values should also be present
expect(result.data.apca_score).toBeDefined();
expect(result.data.compliance.apca_passes).toBeDefined();
}
});
});
describe('APCA Edge Cases', () => {
test('should handle identical colors with APCA', async () => {
const params: CheckContrastParams = {
foreground: '#808080',
background: '#808080',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
// Identical colors should have zero or near-zero APCA score
expect(Math.abs(result.data.apca_score!)).toBeLessThan(5);
expect(result.data.compliance.apca_passes).toBe(false);
}
});
test('should handle extreme color combinations with APCA', async () => {
const extremeCombinations = [
{ foreground: '#000000', background: '#000000' },
{ foreground: '#FFFFFF', background: '#FFFFFF' },
{ foreground: '#FF0000', background: '#00FF00' },
{ foreground: '#0000FF', background: '#FFFF00' },
];
for (const combination of extremeCombinations) {
const params: CheckContrastParams = {
...combination,
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.apca_score).toBeDefined();
expect(typeof result.data.apca_score).toBe('number');
expect(isFinite(result.data.apca_score!)).toBe(true);
}
}
});
test('should handle very similar colors with APCA', async () => {
const params: CheckContrastParams = {
foreground: '#808080',
background: '#818181',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
// Very similar colors should have very low APCA score
expect(Math.abs(result.data.apca_score!)).toBeLessThan(10);
expect(result.data.compliance.apca_passes).toBe(false);
}
});
});
describe('APCA Recommendations', () => {
test('should provide APCA-specific recommendations', async () => {
const params: CheckContrastParams = {
foreground: '#999999',
background: '#AAAAAA',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
expect(result.data.recommendations).toBeInstanceOf(Array);
expect(result.data.recommendations.length).toBeGreaterThan(0);
// Should include accessibility-related recommendations
const recommendationText = result.data.recommendations
.join(' ')
.toLowerCase();
expect(recommendationText).toMatch(/contrast|accessibility|color/);
}
});
test('should generate accessibility notes for APCA', async () => {
const params: CheckContrastParams = {
foreground: '#CCCCCC',
background: '#FFFFFF',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
expect(result.metadata.accessibilityNotes).toBeInstanceOf(Array);
if (result.metadata.accessibilityNotes.length > 0) {
const notesText = result.metadata.accessibilityNotes
.join(' ')
.toLowerCase();
expect(notesText).toMatch(/contrast|apca|accessibility/);
}
}
});
});
describe('APCA Performance', () => {
test('should calculate APCA within reasonable time', async () => {
const params: CheckContrastParams = {
foreground: '#FF0000',
background: '#FFFFFF',
standard: 'APCA',
};
const startTime = Date.now();
const result = await checkContrast(params);
const endTime = Date.now();
expect(result.success).toBe(true);
expect(endTime - startTime).toBeLessThan(100); // Should be very fast
if (result.success) {
expect(result.data.apca_score).toBeDefined();
}
});
});
describe('APCA Response Format', () => {
test('should include APCA fields in response structure', async () => {
const params: CheckContrastParams = {
foreground: '#000000',
background: '#FFFFFF',
standard: 'APCA',
};
const result = await checkContrast(params);
expect(result.success).toBe(true);
if (result.success) {
// Check APCA-specific fields
expect(result.data).toHaveProperty('apca_score');
expect(result.data.compliance).toHaveProperty('apca_passes');
// Ensure WCAG fields are still present
expect(result.data).toHaveProperty('contrast_ratio');
expect(result.data.compliance).toHaveProperty('wcag_aa');
expect(result.data.compliance).toHaveProperty('wcag_aaa');
// Check metadata
expect(result.metadata).toHaveProperty('execution_time');
expect(result.metadata).toHaveProperty('colorSpaceUsed');
}
});
});
});