PHP Quality Control & Assurance 3

Question 1

Which PHPUnit annotation marks a test that is expected to throw a specific exception?

Accepted Answer

@expectedException

Answer

@expectedException (or the method expectException()) tells PHPUnit the test passes only if that exception is thrown.

Question 2

What is a test double in PHPUnit?

Accepted Answer

An object that replaces a real dependency for testing

Answer

A test double is a generic term for stubs, mocks, spies, and fakes used to isolate the unit under test.

Question 3

In PHPStan, what does 'level 8' (max) analysis enforce that lower levels do not?

Accepted Answer

Strict checking of mixed types and all implicit conversions

Answer

PHPStan level 8 adds strict checks on mixed types, requiring explicit handling rather than allowing implicit coercion.

Question 4

Which PHP testing concept verifies that a mock method is called exactly N times?

Accepted Answer

expects($this->exactly(N))

Answer

PHPUnit's expects($this->exactly(N)) sets an expectation that a mocked method is invoked a precise number of times.

Question 5

What is mutation testing in the context of PHP quality assurance?

Accepted Answer

Introducing small code changes to verify tests catch them

Answer

Mutation testing tools like Infection modify code slightly ('mutants') and confirm that existing tests fail for each change.

PHP - PHP Programming Language Practice Test