A developer removes the HTML class attribute from the checkout button, so now it is simply: Checkout There is a test to verify the existence of the…

The test result is a "false positive." The test fails (a "positive" result in defect detection), but it's a "false" alarm because the application's core functionality is not broken. The checkout button still exists and is functional. The test failure is caused by the test itself being brittle; it relies on a specific implementation detail (the class="blue") that has changed, rather than testing the button's actual behavior or existence in a more resilient way. This indicates a flaw in the test, not the code under test.

A. True negative: This would mean the test passed correctly, indicating no defect was found. The test failed.

B. True positive: This would mean the test correctly failed because the button was genuinely broken or missing, which is not the case here.

C. False negative: This would mean the test passed even though there was a real defect. The test did not pass.

1. University of Toronto, CSC301: Introduction to Software Engineering, Fall 2019. Lecture on "Software Testing 1", slide 23, defines False Positive as "Test fails, but no bug."

2. Jest Documentation, "Testing Web Frameworks" section often advises against testing implementation details to avoid brittle tests, which are a common cause of false positives. For example, using selectors that are less likely to change.