Unit testing of PHP function parameter types

By using PHPUnit and @dataProvider annotations, you can unit test the parameter types of PHP functions: Create a test class. Use @dataProvider to provide different types of data. In the test method, use assertType() to assert the parameter type.

Unit testing of PHP function parameter types

Unit testing is the process of verifying that a function or method works as expected. In PHP, you can use the PHPUnit library for unit testing.

Using PHPUnit unit testing function parameter types

1. Create a test class for the function or method to be tested:

class MyFunctionTest extends \PHPUnit\Framework\TestCase
{
    public function testTypeHint()
    {
        // ...
    }
}

2. Use the @dataProvider annotation to provide type-hinted test data:

/**
 * @dataProvider typeHintProvider
 */
public function testTypeHint()
{
    // ...
}

public function typeHintProvider()
{
    return [
        ['int', 1],
        ['string', 'foo'],
        ['array', []],
    ];
}

3. In the test method, use $this->assertType( ) Assert the type of parameter:

public function testTypeHint()
{
    $this->assertType($hint, $arg);
}

Practical case

Consider the following function:

function sum(int $a, int $b)
{
    return $a + $b;
}

Corresponding unit test:

class SumTest extends \PHPUnit\Framework\TestCase
{
    /**
     * @dataProvider typeHintProvider
     */
    public function testTypeHint($hint, $arg)
    {
        $this->assertType($hint, $arg);
    }

    public function typeHintProvider()
    {
        return [
            ['int', 1],
            ['int', '1'], // 失败，'1' 不是 int 类型
            ['string', 'foo'],
            ['array', []],
        ];
    }
}

By running this unit test, you can verify that the parameter types of function sum are checked as expected.

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