去上了鐵哥的 PHP 測試的課程，回來一股腦的想要把每個看的到的可怕東西都 refactor，但鐵哥有交代，refactor 之前最好還是先下測試，正所謂先套保命索，再去走鋼索，好詩好詩，於是這幾天我除了重複看鐵哥的 readme 想熟記心法以外，完全醉心於 Mockery 了，之前也寫過一陣子測試，但有些情況很難模擬，部分原因是自己 code 拆的不夠細不好測，不然就是某些情況必須有外部的結果才能測試，例如說 mail 啦、資料庫等等，鐵哥介紹 Mockery 這個好用的工具以後解決了我的問題，而且我發現寫 code 為了想要好 mock 來拆 code 變成一種 refactoring 的依據，筆記一下這幾天的心得，用最簡單的方式解說，中間跳過一些繁複的過程。
DI
Game.php
class Game
{
public function result(DB $db)
{
return $db->data();
}
}
DB.php
class DB
{
public function data()
{
return false;
}
}
上面執行 var_dump((new Game)->result(new DB)); 的結果會是 false，我們來撰寫測試。
GameTest.php
use Mockery as m;
class GameTest extends PHPUnit_Framework_TestCase
{
public function testResult()
{
$db = new DB;
$game = new Game();
$this->assertTrue($game->result($db));
}
public function tearDown()
{
m::close();
}
}
執行結果
PHPUnit 4.7.5 by Sebastian Bergmann and contributors. F Time: 519 ms, Memory: 9.75Mb There was 1 failure: 1) GameTest::testResult Failed asserting that false is true. D:\www\phpunit\tests\GameTest.php:12 FAILURES! Tests: 1, Assertions: 1, Failures: 1.
因為 DB 的 data() 回傳的是 false，讓我們來 mock 他。
use Mockery as m;
class GameTest extends PHPUnit_Framework_TestCase
{
public function testResult()
{
$db = m::mock('DB');
$db->shouldReceive('data')
->once()
->andReturn(true);
$game = new Game();
$this->assertTrue($game->result($db));
}
public function tearDown()
{
m::close();
}
}
執行結果
PHPUnit 4.7.5 by Sebastian Bergmann and contributors. . Time: 485 ms, Memory: 10.25Mb OK (1 test, 1 assertion)
Mock 內部呼叫 method
Game.php
class Game
{
public function result()
{
return $this->data();
}
public function data()
{
return false;
}
}
執行 var_dump((new Game)->result()); 的結果為 false。
GameTest.php
use Mockery as m;
class GameTest extends PHPUnit_Framework_TestCase
{
public function testResult()
{
$game = new Game();
$this->assertTrue($game->result());
}
public function tearDown()
{
m::close();
}
}
執行結果
PHPUnit 4.7.5 by Sebastian Bergmann and contributors. F Time: 415 ms, Memory: 9.75Mb There was 1 failure: 1) GameTest::testResult Failed asserting that false is true. D:\www\phpunit\tests\GameTest.php:11 FAILURES! Tests: 1, Assertions: 1, Failures: 1.
讓我們使用 partial 來 mock 他。
use Mockery as m;
class GameTest extends PHPUnit_Framework_TestCase
{
public function testResult()
{
$game = m::mock('Game[data]');
$game->shouldReceive('data')
->once()
->andReturn(true);
$this->assertTrue($game->result());
}
public function tearDown()
{
m::close();
}
}
執行結果
PHPUnit 4.7.5 by Sebastian Bergmann and contributors. . Time: 442 ms, Memory: 10.25Mb OK (1 test, 1 assertion)
Mock new class
Game.php
class Game
{
public function result()
{
$db = new DB;
return $db->data();
}
}
執行 var_dump((new Game)->result()); 結果為 false。
GameTest.php
use Mockery as m;
class GameTest extends PHPUnit_Framework_TestCase
{
public function testResult()
{
$game = new Game;
$this->assertTrue($game->result());
}
public function tearDown()
{
m::close();
}
}
執行結果
PHPUnit 4.7.5 by Sebastian Bergmann and contributors. F Time: 403 ms, Memory: 9.75Mb There was 1 failure: 1) GameTest::testResult Failed asserting that false is true. D:\www\phpunit\tests\GameTest.php:11 FAILURES! Tests: 1, Assertions: 1, Failures: 1.
讓我們用 overload 來 mock 他。
use Mockery as m;
class GameTest extends PHPUnit_Framework_TestCase
{
public function testResult()
{
$game = new Game;
$mock = m::mock('overload:DB');
$mock->shouldReceive('data')
->once()
->andReturn(true);
$this->assertTrue($game->result());
}
public function tearDown()
{
m::close();
}
}
執行結果
PHPUnit 4.7.5 by Sebastian Bergmann and contributors. . Time: 466 ms, Memory: 10.25Mb OK (1 test, 1 assertion)
overload 目前發現對 static method 也有效用，但他會無法偵測到其他事件，例如 once()、twice()，所以 static function 建議抽出來執行。
class Game
{
public function result()
{
$data = $this->data();
return $data;
}
public function data()
{
return DB::data();
}
}
這樣就可以使用剛介紹 partial 的方法驗證了。
