Php 如何为json响应编写测试？

我有返回JSON的函数

return response()->json([
            'status' => 'OK',
            'data' => [
                'id' => $routeForecast->id,
            ],
        ])

我怎样才能对此进行测试。。我的laravel版本是5.1，我使用了assertJson[]它给了我这个错误

***** PHPUnit_Framework_Exception: Argument #1 (No Value) of PHPUnit_Framework_Assert::assertJson() must be a string

试着告诉我这个错误

***** Invalid JSON was returned from the route. Perhaps an exception was thrown?

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我怎样才能解决它？？？

试试这样的方法

    // When
    $response = $this->getJson( 'v1/helloWorld' );

    //dd( $response ); // perhaps die and dump here to check response?

    // Then
    $response
        ->assertStatus( 200 )
        ->assertJson( [
            'status' => 'OK',
        ] );

---

我认为assertJson不适用于laravel 5.1这是我对response$response=$this->json'POST'，'/path/en'所做的；啊，对不起，这是5.1中的JSON，对吗$response=$this->json'POST'，'/path/en'；不，看起来你应该做$this->post'/path/en'或$this->call'post'，'/path/en'-