Set compiler by setter for better testability

Mage/Command/BuiltIn/CompileCommand.php

@@ -21,6 +21,21 @@ use Mage\Compiler;
  */
 class CompileCommand extends AbstractCommand
 {
+    /**
+     * @var Compiler
+     */
+    private $compiler;
+
+    public function __construct()
+    {
+        $this->compiler = new Compiler();
+    }
+
+    public function setCompiler(Compiler $compiler)
+    {
+        $this->compiler = $compiler;
+    }
+
     /**
      * @see \Mage\Compile::compile()
      */

tests/MageTest/Command/BuiltIn/CompileCommandTest.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace MageTest\Command\BuiltIn;
+
+use Mage\Command\BuiltIn\CompileCommand;
+use MageTest\TestHelper\BaseTest;
+
+/**
+ * Class CompileCommandTest
+ * @package MageTest\Command\BuiltIn
+ * @coversDefaultClass Mage\Command\BuiltIn\CompileCommand
+ * @uses Mage\Compiler
+ */
+class CompileCommandTest extends BaseTest
+{
+    /**
+     * @var CompileCommand
+     */
+    private $compileCommand;
+
+    /**
+     * @before
+     */
+    public function before()
+    {
+        $this->compileCommand = new CompileCommand();
+    }
+
+    /**
+     * @covers ::__construct
+     */
+    public function testConstruct()
+    {
+        $compileCommand = new CompileCommand();
+
+        $compilerProperty = $this->getPropertyValue($compileCommand, 'compiler');
+        $this->assertInstanceOf('Mage\Compiler', $compilerProperty);
+    }
+
+    /**
+     * @covers ::setCompiler
+     */
+    public function testSetCompiler()
+    {
+        $compilerMock = $this->getMock('Mage\Compiler');
+        $this->compileCommand->setCompiler($compilerMock);
+
+        $compilerProperty = $this->getPropertyValue($this->compileCommand, 'compiler');
+        $this->assertEquals($compilerMock, $compilerProperty);
+    }
+}