PHPUnit：测试函数是否只被调用一次

使用PHPUnit，我想测试一个函数在模拟类中只调用一次。我测试了几个案例，以确保理解

excepts（）

：

functionInMock

未执行（正常，预期结果：无错误）：

functionInMock

执行1次（Ok，预期结果：无错误）：

functionInMock

执行2次（Ok，预期结果：error）：

functionInMock

执行一次：

$myMock
    ->expects($this->exactly(2))
    ->method('functionInMock')
;

or

$myMock
    ->expects($this->exactly(999))
    ->method('functionInMock')
;

---

为什么在最后一个案例中我没有错误？测试通过，但没有报告错误。

我不确定您为什么会出现意外行为，但这个示例运行良好

<?php

// Lets name it 'SampleTest.php

declare(strict_types=1);

use PHPUnit\Framework\TestCase;

class SampleTest extends TestCase
{
    public function testSample(): void
    {
        $myMock = $this
            ->getMockBuilder(Sample::class)
            ->addMethods(['functionInMock'])
            ->getMock();
        $myMock
            ->expects($this->exactly(2))
            ->method('functionInMock');
        $myMock->functionInMock();
    }
}

class Sample
{
    public function function2InMock(): void
    {
    }
}

---

我不知道你为什么会有意想不到的行为，但这个例子效果很好

<?php

// Lets name it 'SampleTest.php

declare(strict_types=1);

use PHPUnit\Framework\TestCase;

class SampleTest extends TestCase
{
    public function testSample(): void
    {
        $myMock = $this
            ->getMockBuilder(Sample::class)
            ->addMethods(['functionInMock'])
            ->getMock();
        $myMock
            ->expects($this->exactly(2))
            ->method('functionInMock');
        $myMock->functionInMock();
    }
}

class Sample
{
    public function function2InMock(): void
    {
    }
}

$myMock
    ->expects($this->exactly(2))
    ->method('functionInMock')
;

or

$myMock
    ->expects($this->exactly(999))
    ->method('functionInMock')
;

<?php

// Lets name it 'SampleTest.php

declare(strict_types=1);

use PHPUnit\Framework\TestCase;

class SampleTest extends TestCase
{
    public function testSample(): void
    {
        $myMock = $this
            ->getMockBuilder(Sample::class)
            ->addMethods(['functionInMock'])
            ->getMock();
        $myMock
            ->expects($this->exactly(2))
            ->method('functionInMock');
        $myMock->functionInMock();
    }
}

class Sample
{
    public function function2InMock(): void
    {
    }
}

$ phpunit SampleTest.php 
PHPUnit 9.1.1 by Sebastian Bergmann and contributors.

F                                                                   1 / 1 (100%)

Time: 125 ms, Memory: 6.00 MB

There was 1 failure:

1) SampleTest::testSample
Expectation failed for method name is "functionInMock" when invoked 2 time(s).
Method was expected to be called 2 times, actually called 1 times.

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.