Php 嘲弄MongoCollection时的奇怪行为

假设我有这个测试：

public function testStorage()
{
    $collection = $this->getMockBuilder('MongoCollection')->disableOriginalConstructor()->getMock();

    $collection->method('findOne')->will($this->returnValueMap([
        [['_id' => 'aaa'], ['content'], 'ccc'],
    ]));

    $this->assertEquals('ccc', $collection->findOne(['_id' => 'aaa'], ['content']));
}

当运行单元测试时，它说：断言null与预期的“ccc”匹配失败。 我不明白为什么。但如果我切换到mock另一个函数，比如：find它应该工作

public function testStorage()
{
    $collection = $this->getMockBuilder('MongoCollection')->disableOriginalConstructor()->getMock();

    $collection->method('find')->will($this->returnValueMap([
        [['_id' => 'aaa'], ['content'], 'ccc'],
    ]));

    $this->assertEquals('ccc', $collection->find(['_id' => 'aaa'], ['content']));
}

OK（1个测试，1个断言）

---

我真的很感谢你的帮助！多谢各位

我使用getMock，它对我很有用：

$collection = $this->getMock('MongoCollection', ['find', 'findOne'], [], '', false);
        $collection->method('find')->will($this->returnValue([
                [['_id' => 'aaa'], ['content'], 'ccc']
            ]));
        $collection->method('findOne')->will($this->returnValue([
            [['_id' => 'aaa'], ['content'], 'ccc']
        ]));