Add uninstall test

See #6

composer.json

@@ -0,0 +1,5 @@
+{
+    "require-dev": {
+        "wordpoints/module-uninstall-tester": "^0.3.0"
+    }
+}

tests/phpunit/tests/uninstall.php

@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * Test case for the module's unisntallation routine.
+ *
+ * @package WordPoints_Beta_Tester
+ * @since 1.0.4
+ */
+
+/**
+ * Test that the module uninstalls itself properly.
+ *
+ * @since 1.0.4
+ *
+ * @group uninstall
+ */
+class WordPoints_Beta_Tester_Uninstall_Test extends WordPoints_Module_Uninstall_UnitTestCase {
+
+	/**
+	 * @since 1.0.4
+	 */
+	public function setUp() {
+
+		$this->module_file = 'beta-tester/beta-tester.php';
+
+		parent::setUp();
+	}
+
+	/**
+	 * Tests uninstallation.
+	 *
+	 * @since 1.0.4
+	 */
+	public function test() {
+
+		add_site_option( 'wordpoints_beta_version', 'test' );
+
+		$this->uninstall();
+
+		$this->assertEmpty( get_site_option( 'wordpoints_beta_version' ) );
+	}
+}
+
+// EOF