[TEST] Add UnitTest for Singleton trait

Author: smichaelsen

tests/Unit/SingletonTest.php

@@ -0,0 +1,30 @@
+<?php
+namespace AppZap\PHPFramework\Tests\Unit;
+
+use AppZap\PHPFramework\Domain\Repository\AbstractDomainRepository;
+
+class TestRepository1 extends AbstractDomainRepository{}
+class TestRepository2 extends AbstractDomainRepository{}
+
+class SingletonTest extends \PHPUnit_Framework_TestCase {
+
+  /**
+   * @test
+   */
+  public function getTheSameInstanceEveryTime() {
+    $repo1Instance1 = TestRepository1::getInstance();
+    $repo1Instance2 = TestRepository1::getInstance();
+    $this->assertSame($repo1Instance1, $repo1Instance2);
+  }
+
+  /**
+   * @test
+   */
+  public function getRightClass() {
+    $repo1Instance1 = TestRepository1::getInstance();
+    $repo2Instance1 = TestRepository2::getInstance();
+    $this->assertTrue($repo1Instance1 instanceof TestRepository1);
+    $this->assertTrue($repo2Instance1 instanceof TestRepository2);
+  }
+
+}