Guard SkipLinkFix against empty targets#1411
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Summary of ChangesHello @SteveJonesDev, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request resolves an issue where an invalid frontend fix payload could be registered if the configured skip-link target IDs were empty or consisted solely of delimiters and whitespace. The changes ensure that the target array is properly initialized and that the fix payload is only registered when valid targets are present, enhancing the robustness of the skip-link functionality and preventing potential frontend errors. Highlights
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WalkthroughThe changes add input validation to the SkipLinkFix class by introducing an early return when target values are empty, preventing unnecessary filter registration. A complementary unit test verifies this edge case behavior. Changes
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Code Review
This pull request effectively addresses a bug where an empty or whitespace-only skip link target string could cause issues by leaving the $targets array undefined. The changes correctly initialize the array and add a guard to prevent registering a filter with no valid targets. The addition of a regression test is also a great practice. I have one suggestion to make the new test even more robust by using a data provider to cover multiple edge cases for empty targets.
| public function test_frontend_data_skips_empty_targets() { | ||
| update_option( 'edac_fix_add_skip_link', true ); | ||
| update_option( 'edac_fix_add_skip_link_target_id', ' , , # , ' ); | ||
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| $this->fix->run(); | ||
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| $data = apply_filters( 'edac_filter_frontend_fixes_data', [] ); | ||
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| $this->assertArrayNotHasKey( 'skip_link', $data ); | ||
| } |
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This is a great regression test! To make it even more robust, you could consider using a PHPUnit data provider to test various forms of empty or invalid input strings. This would ensure that different edge cases are handled correctly.
Here's an example of how you could implement this:
/**
* Test frontend data is not added when targets are empty.
*
* @dataProvider provide_empty_targets
* @return void
*/
public function test_frontend_data_skips_empty_targets( string $target_string ) {
update_option( 'edac_fix_add_skip_link', true );
update_option( 'edac_fix_add_skip_link_target_id', $target_string );
$this->fix->run();
$data = apply_filters( 'edac_filter_frontend_fixes_data', [] );
$this->assertArrayNotHasKey( 'skip_link', $data );
}
/**
* Data provider for empty targets test.
*
* @return array
*/
public function provide_empty_targets(): array {
return [
'empty string' => [ '' ],
'whitespace only' => [ ' ' ],
'commas only' => [ ',,' ],
'commas and whitespace' => [ ' , , ' ],
'hash only' => [ '#' ],
'hash with whitespace and commas' => [ ' , , # , ' ],
];
}1 participant
Summary
Root Cause
SkipLinkFix::run()appended into$targetswithout initialization and then always captured it in a filter closure. Whenedac_fix_add_skip_link_target_idcontained only delimiters/whitespace,$targetsstayed undefined.Evidence Type
test_frontend_data_skips_empty_targets)lint:js,lint:php,test:php)Risk Assessment
Low. Change is isolated to skip-link target normalization and only affects the empty-target edge case.
Environment Limitations
None for this run.
Summary by CodeRabbit
Release Notes
Bug Fixes
Tests