PhpUnit and string

Question

I started learning PhpUnit and testing. I have a method which returns string, how I can write a test to check if this method returns string. Here is the code I have at this moment:

Method:

 /**
 * @return string
 */
public function living()
{
    return 'Happy!';
}

Test:

 public $real;
public $expected;

public function testLiving()
{
    $this->expected = 'Happy';
    $this->real = 'Speechless';
    $this->assertTrue($this->expected == $this->real);
}

Ashish Awasthi · Accepted Answer · 2014-11-04 07:45:36Z

2

You can use $this->assertInternalType to check for type of the data, and if you want to test such functions use Test Doubles or Mocking Object.

Here is the code giving full demo on how you can test:

//Your Class
class StringReturn {
    public function returnString()
    {
        return 'Happy';
    }
}


//Your Test Class
class StringReturnTest extends PHPUnit_Framework_TestCase
{
    public function testReturnString()
    {
        // Create a stub for the SomeClass class.
        $stub = $this->getMockBuilder('StringReturn')
        ->disableOriginalConstructor()
        ->getMock();

        // Configure the stub.
        $stub->method('returnString')
        ->willReturn('Happy');


        $this->assertEquals('Happy', $stub->returnString());
        $this->assertInternalType('string', $stub->returnString());
    }  
}

edited Nov 4, 2014 at 7:45

answered Nov 4, 2014 at 7:25

Ashish Awasthi

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Comments

po_taka · Accepted Answer · 2014-11-04 07:15:12Z

1

$this->assertTrue($this->expected == $this->real);

is the same as

$this->assertEquals($this->expected, $this->real);

See https://phpunit.de/manual/current/en/appendixes.assertions.html#appendixes.assertions.assertEquals

Both check if given variables are equal.

You could check if variable is string

$this->assertTrue(is_string($this->real));

answered Nov 4, 2014 at 7:15

po_taka

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1 Comment

gontrollez Over a year ago

They're the same when they pass, but when assertEquals fails, it will tell you where the difference is, whereas assertTrue will just tell you that false is not true.

Ilya Isaev · Accepted Answer · 2014-11-04 07:29:38Z

1

Test check only positive. You need check negative too.

public function testLiving()
{
    $classWithLivingMethod = new ClassWithLivingMethod;
    $this->assertTrue(is_string($classWithLivingMethod->living()));
    $this->assertEquals('Happy', $classWithLivingMethod->living());
}

answered Nov 4, 2014 at 7:29

Ilya Isaev

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