使用 PHPUnit 模拟对象测试模板方法设计模式实现

Question

假设我有模板方法设计模式实现的代码。我想在我的模板方法中测试方法调用的顺序和计数。我尝试使用 PHPUnit 模拟。我的源代码如下所示：

class Foo {

    public function __construct() {}

    public function foobar() {
        $this->foo();
        $this->bar();
    }

    protected function foo() {}

    protected function bar() {}
}


class FooTest extends PHPUnit_Framework_TestCase {

    public function testFoo() {
        $fooMock = $this->getMock('Foo', array('foo', 'bar'));

        $fooMock->foobar();

        $fooMock->expects($this->once())->method('foo');
        $fooMock->expects($this->once())->method('bar');
    }
} 

结果我有这样的错误：

PHPUnit_Framework_ExpectationFailedException : 
Expectation failed for method name is equal to <string:foo> when invoked 1 time(s).
Method was expected to be called 1 times, actually called 0 times.

是否可以使用模拟对象在这种情况下计算方法调用？

Answer 1

这只是我的愚蠢错误。错误的模拟对象创建顺序：

// ...

public function testFoo() {
    $fooMock = $this->getMock('Foo', array('foo', 'bar'));
    $fooMock->expects($this->once())->method('foo');  // (!) immediately after          
    $fooMock->expects($this->once())->method('bar');  // mock object instantiation

    $fooMock->foobar();
}