在单元测试时使用Laravel辅助函数

Question

I am testing a class I made that uses a helper function. The function I'm testing looks like:

public function upload(UploadedFile $file)
{
    $file = $file->move(base_path() . '/temp');
    $file = new FileSystemPicture($file);

    return $file;
}

When I run the tests and it hits the helper function it says:

PHP Fatal error:  Call to a member function make() on a non-object

I have tracked the helper function down to be the following code:

function base_path($path = '')
{
    return app()->make('path.base').($path ? '/'.$path : $path);
}

I know that I'm getting the error because the "app" hasn't been created because I'm only testing the my class, not the whole application. Are there other effective ways to get the root directory of my project or is there a way to force the "app" to load so it can be used in this function?

Answer 1

I had this problem, solved making sure that:

1. My test class extended TestCase.
2. If my test class had a setUp() method, it called parent::setUp()

app_path() and similar functions worked after that.

Answer 2

There is a way to mock helper functions that use app() function in a complete isolation from laravel environment. Considering that your package has illuminate/support dependency you could do something like this:

<?php

    class Test extends PHPUnit_Framework_TestCase
    {
        protected function mockApplication(array $methods = [])
        {
            return $this->getMock('Illuminate\Foundation\Application', $methods);
        }

        public function testHelperFunction()
        {
            $appMock = $this->mockApplication(['make']);

            \Illuminate\Support\Facades\Facade::setFacadeApplication($appMock);

            $testPath = "my/path";
            $myPath = "otherPath";

            $expectedValue = "{$testPath}/{$myPath}";

            $appMock->expects($this->once())
                    ->method('make')->with('path.base')
                    ->will($this->returnCallback(function () use ($testPath) {
                        return $testPath;
                    }));

            $this->assertSame($expectedValue, base_path($myPath));
        }

    }

Answer 3

I just ran into this issue, and my solution is to wrap the whole helpers.php contents with

if (!file_exists('newFunction')) {

This should prevent the attempt at re-declaring the functions after the first test case has executed.