PHP Quality Control & Assurance 2 — Questions and Answers
Question 1: Which PHPUnit method asserts that two arrays have identical key-value pairs regardless of order?
- assertArrayEquals()
- assertSameArray()
- assertEqualsCanonicalizing() (Correct answer)
- assertArrayIdentical()
Correct answer: assertEqualsCanonicalizing()
assertEqualsCanonicalizing() sorts arrays before comparing so order does not matter.
Question 2: What is the purpose of a code coverage threshold in a CI pipeline?
- To measure execution speed
- To fail the build when coverage drops below a set percentage (Correct answer)
- To count the number of unit tests
- To enforce PSR coding standards
Correct answer: To fail the build when coverage drops below a set percentage
A coverage threshold causes the CI build to fail if the percentage of covered code falls below the configured minimum.
Question 3: Which Composer script command is commonly used to run PHPStan static analysis?
- composer test
- composer analyse (Correct answer)
- composer lint
- composer check
Correct answer: composer analyse
By convention, projects add a 'analyse' script in composer.json that runs PHPStan, though the name is configurable.
Question 4: In PHP, which function verifies that a value is exactly equal to another value AND of the same type?
- assertEqual()
- assertSame() uses === (Correct answer)
- assertIdentical()
- assertStrictEquals()
Correct answer: assertSame() uses ===
PHPUnit's assertSame() uses strict comparison (===), checking both value and type.
Question 5: What does PHP_CodeSniffer's 'phpcbf' tool do?
- Analyzes code for bugs
- Automatically fixes coding standard violations (Correct answer)
- Runs unit tests
- Generates API documentation
Correct answer: Automatically fixes coding standard violations
phpcbf (PHP Code Beautifier and Fixer) automatically corrects many coding standard violations detected by phpcs.
Question 6: Which PHPUnit feature allows you to run the same test with multiple sets of input data?
- Test suites
- Data providers (Correct answer)
- Mock factories
- Fixtures
Correct answer: Data providers
Data providers are methods annotated with @dataProvider that supply arrays of argument sets to a test method.
Question 7: What is Rector used for in PHP projects?
- Generating test coverage reports
- Automated code refactoring and upgrades (Correct answer)
- Managing Composer dependencies
- Running integration tests
Correct answer: Automated code refactoring and upgrades
Rector is an automated refactoring tool that applies configurable rules to upgrade or modernize PHP code.
PHP Quality Control & Assurance 2
Which PHPUnit method asserts that two arrays have identical key-value pairs regardless of order?