我想知道是否有一种相当简洁的方法来模拟支持方法链接的对象...例如,数据库查询对象可能有一个如下所示的方法调用:
$result = $database->select('my_table')->where(array('my_field'=>'a_value'))->limit(1)->execute();
如果我必须模拟两个不同的选择查询以便它们返回不同的结果,则会出现问题。有什么想法吗?
这是关于PHPUnit的,但其他单元测试框架的经验会有所帮助。
答案 0 :(得分:14)
我不确定这是你在找什么,所以请发表评论:
class StubTest extends PHPUnit_Framework_TestCase
{
public function testChainingStub()
{
// Creating the stub with the methods to be called
$stub = $this->getMock('Zend_Db_Select', array(
'select', 'where', 'limit', 'execute'
), array(), '', FALSE);
// telling the stub to return a certain result on execute
$stub->expects($this->any())
->method('execute')
->will($this->returnValue('expected result'));
// telling the stub to return itself on any other calls
$stub->expects($this->any())
->method($this->anything())
->will($this->returnValue($stub));
// testing that we can chain the stub
$this->assertSame(
'expected result',
$stub->select('my_table')
->where(array('my_field'=>'a_value'))
->limit(1)
->execute()
);
}
}
您可以将其与期望结合起来:
class StubTest extends PHPUnit_Framework_TestCase
{
public function testChainingStub()
{
// Creating the stub with the methods to be called
$stub = $this->getMock('Zend_Db_Select', array(
'select', 'where', 'limit', 'execute'
), array(), '', FALSE);
// overwriting stub to return something when execute is called
$stub->expects($this->exactly(1))
->method('execute')
->will($this->returnValue('expected result'));
$stub->expects($this->exactly(1))
->method('limit')
->with($this->equalTo(1))
->will($this->returnValue($stub));
$stub->expects($this->exactly(1))
->method('where')
->with($this->equalTo(array('my_field'=>'a_value')))
->will($this->returnValue($stub));
$stub->expects($this->exactly(1))
->method('select')
->with($this->equalTo('my_table'))
->will($this->returnValue($stub));
// testing that we can chain the stub
$this->assertSame(
'expected result',
$stub->select('my_table')
->where(array('my_field'=>'a_value'))
->limit(1)
->execute()
);
}
}
答案 1 :(得分:1)
我知道这是一个古老的问题,但它可能对未来的Google员工有所帮助。
我在找到一个框架时遇到了问题,该框架将为模拟提供简单易用的语法。存根方法链接。然后我决定编写一个简单易用的模拟库。
用法示例:
// Creating a new mock for SimpleClassForMocking
$mock = ShortifyPunit::mock('SimpleClassForMocking');
ShortifyPunit::when($mock)->first_method()
->second_method(2,3)->returns(1);
ShortifyPunit::when($mock)->first_method()
->second_method(2,3,4)->returns(2);
ShortifyPunit::when($mock)->first_method(1)
->second_method(2,3,4)->returns(3);
ShortifyPunit::when($mock)->first_method(1,2,3)
->second_method(1,2)->third_method()->returns(4);
$mock->first_method()->second_method(2,3); // returns 1
$mock->first_method()->second_method(2,3,4); // returns 2
$mock->first_method(1)->second_method(2,3,4); // returns 3
$mock->first_method(1,2,3)->second_method(1,2)->third_method(); // return 4
GitHub的:
https://github.com/danrevah/ShortifyPunit#stubbing-method-chanining
答案 2 :(得分:0)
这可能不是您正在寻找的答案,但我在几年前编写了一个模拟对象框架,它将处理这种“取决于输入”的断言:
http://code.google.com/p/yaymock/
http://code.google.com/p/yaymock/wiki/Expectations
我把它写在支持Swift Mailer的单元测试中,但它还没有被其他任何项目广泛采用(我知道)。目的是提供比PHPUnit和SimpleTest提供的模拟对象调用更好的控制和内省。