Adds tests for the main plugin class

phpunit.xml.dist

@@ -10,7 +10,7 @@
   </php>
   <testsuites>
     <testsuite name="default">
-      <directory prefix="test_" suffix=".php">tests/</directory>
+      <directory prefix="test-" suffix=".php">tests/</directory>
     </testsuite>
   </testsuites>
 </phpunit>

tests/test-starter-plugin.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * Class Test_Starter_Plugin
+ *
+ * @package Starter_Plugin
+ */
+
+/**
+ * Sample test case.
+ */
+class Test_Starter_Plugin extends WP_UnitTestCase {
+	public function set_up() {
+        parent::set_up();
+
+        // Mock that we're in WP Admin context.
+		// See https://wordpress.stackexchange.com/questions/207358/unit-testing-in-the-wordpress-backend-is-admin-is-true
+        set_current_screen( 'edit-post' );
+
+        $this->starter_plugin = new Starter_Plugin();
+    }
+
+    public function tear_down() {
+        parent::tear_down();
+    }
+
+	public function test_has_correct_token() {
+		$has_correct_token = ( 'starter-plugin' === $this->starter_plugin->token );
+
+		$this->assertTrue( $has_correct_token );
+	}
+
+	public function test_has_admin_interface() {
+		$has_admin_interface = ( is_a( $this->starter_plugin->admin, 'Starter_Plugin_Admin' ) );
+
+		$this->assertTrue( $has_admin_interface );
+	}
+
+	public function test_has_settings_interface() {
+		$has_settings_interface = ( is_a( $this->starter_plugin->settings, 'Starter_Plugin_Settings' ) );
+
+		$this->assertTrue( $has_settings_interface );
+	}
+
+	public function test_has_post_types() {
+		$has_post_types = ( 0 < count( $this->starter_plugin->post_types ) );
+
+		$this->assertTrue( $has_post_types );
+	}
+
+	public function test_has_load_plugin_textdomain() {
+		$has_load_plugin_textdomain = ( is_int( has_action( 'init', [ $this->starter_plugin, 'load_plugin_textdomain' ] ) ) );
+
+		$this->assertTrue( $has_load_plugin_textdomain );
+	}
+}