How to assert variadic function has exactly n parameters with PHPUnit

Question

PHPUnit version : 11.5.6

Given a class Foo with bar method with variadic params:

class Foo
{
    public function bar(int ...$params): void {}
}

I mock a Foo instance in a test and want to assert bar has been called with exactly 2 parameters (not one more).

public function testIsCalledWithTwoParameters()
{
    $mock = $this->createMock(Foo::class);

    $mock->expects($this->once())
         ->method('bar')
         ->with(1, 2);

    $mock->bar(1, 2);
}

Problem is: changing call for $mock->bar(1, 2, 3); will not trigger an error.

NB 1: With previous versions of PHPUnit, variadic params were sent to callback as a unique array but it seems it is not longer the case in 11.5.6.

ERO · Accepted Answer · 2025-04-17 20:38:59Z

0

public function testIsCalledWithTwoParameters()
{
    $mock = $this->createMock(Foo::class);

    $mock->expects($this->once())
        ->method('bar')
        ->with($this->callback(function (int ...$args): true {
            $this->assertCount(2, $args);
            $this->assertEquals(1, $args[0]);
            $this->assertEquals(2, $args[1]);
            return true;
        });

    // will fail
    $mock->bar(1, 2, 3);
}

answered Apr 17 at 20:38

ERO

554 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Community Apr 19 at 9:09

Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.

Collectives™ on Stack Overflow

How to assert variadic function has exactly n parameters with PHPUnit

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related