Enforce "en" lang in tests.

Some tests compare the result to english strings.

Do not test UnixCommandExecutor on Windows.

PharTest: explain why PHAR writing test are skipped.

InstallCommandTest: mock checkRequirements to allow the tests to run.

Run php_parallel_lint before all other tests.

Close #846

Tests/PHPCI/Helper/BuildInterpolatorTest.php

@@ -1,11 +1,18 @@
 <?php
 
-namespace PHPCI\Plugin\Tests\Helper;
+/**
+ * PHPCI - Continuous Integration for PHP
+ *
+ * @copyright    Copyright 2015, Block 8 Limited.
+ * @license      https://github.com/Block8/PHPCI/blob/master/LICENSE.md
+ * @link         https://www.phptesting.org/
+ */
+
+namespace Tests\PHPCI\Plugin\Helper;
 
 use PHPCI\Helper\BuildInterpolator;
-use Prophecy\PhpUnit\ProphecyTestCase;
 
-class BuildInterpolatorTest extends ProphecyTestCase
+class BuildInterpolatorTest extends \PHPUnit_Framework_TestCase
 {
     /**
      * @var BuildInterpolator
@@ -46,4 +53,4 @@ class BuildInterpolatorTest extends ProphecyTestCase
         $this->assertEquals($expectedOutput, $actualOutput);
     }
 }
- 
+