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test: add comprehensive edge case tests for postcss-unit-processor
Add tests for quoted strings, selector blacklisting, property filtering patterns, file exclusion options, media queries, and error handling to improve coverage.
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‎index.test.js‎

Lines changed: 372 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -286,4 +286,376 @@ describe('postcss-unit-processor', () => {
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{ processor }
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);
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});
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// Test quoted string values that should not be processed
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it('should not process values in quoted strings', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { content: "100px"; background: url(100px); width: 100px; }',
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'div { content: "100px"; background: url(100px); width: 200px; }',
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{ processor }
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);
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});
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// Test blacklistedSelector with non-string selector
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it('should handle non-string selector in blacklist check', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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// Create CSS with a rule that has no selector
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const input = 'div { width: 100px; }';
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const result = await postcss([unitProcessor({ processor, selectorBlackList: ['test'] })])
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.process(input, { from: undefined });
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expect(result.css).toEqual('div { width: 200px; }');
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});
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// Test property list with notContain pattern
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it('should not process properties containing blacklisted string', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { max-width: 100px; min-test-width: 50px; width: 75px; height: 25px; }',
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'div { max-width: 200px; min-test-width: 50px; width: 150px; height: 50px; }',
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{ processor, propList: ['*', '!*test*'] }
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);
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});
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// Test property list with notStartWith pattern
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it('should not process properties starting with blacklisted string', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { max-width: 100px; test-width: 50px; width: 75px; height: 25px; }',
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'div { max-width: 200px; test-width: 50px; width: 150px; height: 50px; }',
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{ processor, propList: ['*', '!test*'] }
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);
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});
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// Test property list with notEndWith pattern
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it('should not process properties ending with blacklisted string', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { max-width: 100px; width-test: 50px; width: 75px; height: 25px; }',
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'div { max-width: 200px; width-test: 50px; width: 150px; height: 50px; }',
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{ processor, propList: ['*', '!*test'] }
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);
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});
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// Test exclude option with function that returns true
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it('should exclude files when exclude function returns true', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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const input = 'div { width: 100px; }';
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const result = await postcss([unitProcessor({ processor, exclude: () => true })])
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.process(input, { from: 'test.css' });
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expect(result.css).toEqual('div { width: 100px; }');
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});
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// Test exclude option with string that matches file path
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it('should exclude files when file path contains exclude string', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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const input = 'div { width: 100px; }';
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const result = await postcss([unitProcessor({ processor, exclude: 'test' })])
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.process(input, { from: 'test.css' });
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expect(result.css).toEqual('div { width: 100px; }');
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});
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// Test exclude option with regex that matches file path
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it('should exclude files when file path matches exclude regex', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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const input = 'div { width: 100px; }';
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const result = await postcss([unitProcessor({ processor, exclude: /test/ })])
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.process(input, { from: 'test.css' });
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expect(result.css).toEqual('div { width: 100px; }');
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});
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// Test media query processing when excluded
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it('should not process media queries when file is excluded', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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const input = '@media (max-width: 600px) { div { width: 100px; } }';
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const result = await postcss([unitProcessor({ processor, mediaQuery: true, exclude: /test/ })])
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.process(input, { from: 'test.css' });
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expect(result.css).toEqual('@media (max-width: 600px) { div { width: 100px; } }');
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});
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// Test blacklistedSelector function directly by manipulating parent selector
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it('should handle declaration with non-string parent selector', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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const testPlugin = () => {
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return {
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postcssPlugin: 'test-manipulation',
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Once(root) {
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// Apply unitProcessor first
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const unitProc = unitProcessor({ processor, selectorBlackList: ['test'] });
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if (unitProc.Once) unitProc.Once(root);
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root.walkDecls(decl => {
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if (decl.prop === 'width') {
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// Temporarily set selector to non-string to trigger the blacklist check
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const originalSelector = decl.parent.selector;
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decl.parent.selector = undefined;
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// Manually call the blacklist check portion
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if (unitProc.Declaration) {
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try {
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unitProc.Declaration(decl);
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} catch (e) {
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// Expected to fail due to unitReplace not being properly initialized in this context
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}
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}
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// Restore selector
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decl.parent.selector = originalSelector;
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}
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});
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}
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};
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};
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testPlugin.postcss = true;
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const input = 'div { width: 100px; }';
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await postcss([testPlugin()])
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.process(input, { from: undefined });
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});
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// Test customUnitList with non-array value
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it('should handle non-array customUnitList', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: value * 2, unit: 'px' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 200px; }',
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{ processor, customUnitList: 'not-an-array' }
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);
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});
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// Test customUnitList with invalid units
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it('should filter out invalid custom units', async () => {
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const processor = (value, unit) => {
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if (unit === 'valid') {
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return { value: value * 2, unit: 'valid' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { width: 100valid; margin: 50invalid123; padding: 25; }',
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'div { width: 200valid; margin: 50invalid123; padding: 25; }',
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{
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processor,
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customUnitList: [
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'valid', // valid
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'invalid123', // invalid - contains numbers
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123, // invalid - not a string
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'', // invalid - empty string
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' ', // invalid - only whitespace
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null, // invalid - null
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'spec@al' // invalid - contains special chars
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]
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}
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);
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});
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// Test processor returning object with null value
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it('should handle processor returning object with null value', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: null, unit: 'px' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 0; }',
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{ processor }
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);
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});
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// Test processor returning object with undefined value
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it('should handle processor returning object with undefined value', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: undefined, unit: 'px' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 0; }',
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{ processor }
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);
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});
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// Test processor returning object with falsy unit
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it('should handle processor returning object with falsy unit', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: 50, unit: '' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 50px; }',
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{ processor }
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);
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});
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// Test processor returning object with null unit
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it('should handle processor returning object with null unit', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: 50, unit: null };
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}
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return { value, unit };
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 50px; }',
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{ processor }
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);
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});
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// Test processor returning string number
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it('should handle processor returning string number', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return '75.5';
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}
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return value;
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 75.5px; }',
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{ processor }
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);
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});
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// Test processor returning NaN string
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it('should handle processor returning non-numeric string', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return 'not-a-number';
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}
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return value;
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 0; }',
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{ processor }
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);
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});
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// Test processor returning 0 value
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it('should handle processor returning 0 value', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return 0;
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}
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return value;
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 0; }',
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{ processor }
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);
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});
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// Test processor returning object with 0 value
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it('should handle processor returning object with 0 value', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return { value: 0, unit: 'px' };
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}
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return { value, unit };
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 0; }',
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{ processor }
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);
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});
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// Test processor returning exact number type
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it('should handle processor returning exact number type', async () => {
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const processor = (value, unit) => {
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if (unit === 'px') {
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return 42.75;
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}
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return value;
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};
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await testProcess(
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'div { width: 100px; }',
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'div { width: 42.75px; }',
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{ processor }
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);
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});
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// Test unitProcessor with no options (default parameter)
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it('should handle unitProcessor called without options', async () => {
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const input = 'div { width: 100px; }';
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const result = await postcss([unitProcessor()])
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.process(input, { from: undefined });
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expect(result.css).toEqual('div { width: 100px; }');
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expect(result.warnings()).toHaveLength(0);
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});
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// Test unitProcessor with undefined options (default parameter)
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it('should handle unitProcessor called with undefined options', async () => {
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const input = 'div { width: 100px; }';
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const result = await postcss([unitProcessor(undefined)])
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.process(input, { from: undefined });
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expect(result.css).toEqual('div { width: 100px; }');
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expect(result.warnings()).toHaveLength(0);
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});
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});

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