split unit test into separate test classes

test/StatifyBlacklist_System_Test.php

@@ -0,0 +1,67 @@
+<?php
+/**
+ * Statify Filter: Unit Test
+ *
+ * This is a PHPunit test class for the plugin's functionality
+ *
+ * @package Statify_Blacklist
+ */
+
+/**
+ * Class StatifyBlacklist_System_Test.
+ *
+ * PHPUnit test class for StatifyBlacklist_System.
+ */
+class StatifyBlacklist_System_Test extends PHPUnit\Framework\TestCase {
+
+	/**
+	 * Test the upgrade methodology for configuration options.
+	 *
+	 * @return void
+	 */
+	public function test_upgrade() {
+		// Create configuration of version 1.3.
+		$options13 = array(
+			'active_referer' => 1,
+			'cron_referer'   => 0,
+			'referer'        => array(
+				'example.net' => 0,
+				'example.com' => 1,
+			),
+			'referer_regexp' => 0,
+			'version'        => 1.3,
+		);
+
+		// Set options in mock.
+		update_option( 'statify-blacklist', $options13 );
+
+		// Execute upgrade.
+		StatifyBlacklist_System::upgrade();
+
+		// Retrieve updated options.
+		$options_updated = get_option( 'statify-blacklist' );
+
+		// Verify size against default options (no junk left).
+		$this->assertEquals( 4, count( $options_updated ) );
+		$this->assertEquals( 4, count( $options_updated['referer'] ) );
+		$this->assertEquals( 4, count( $options_updated['target'] ) );
+		$this->assertEquals( 2, count( $options_updated['ip'] ) );
+
+		// Verify that original attributes are unchanged.
+		$this->assertEquals( $options13['active_referer'], $options_updated['referer']['active'] );
+		$this->assertEquals( $options13['cron_referer'], $options_updated['referer']['cron'] );
+		$this->assertEquals( $options13['referer'], $options_updated['referer']['blacklist'] );
+		$this->assertEquals( $options13['referer_regexp'], $options_updated['referer']['regexp'] );
+
+		// Verify that new attributes are present in config and filled with default values (disabled, empty).
+		$this->assertEquals( 0, $options_updated['target']['active'] );
+		$this->assertEquals( 0, $options_updated['target']['cron'] );
+		$this->assertEquals( 0, $options_updated['target']['regexp'] );
+		$this->assertEquals( array(), $options_updated['target']['blacklist'] );
+		$this->assertEquals( 0, $options_updated['ip']['active'] );
+		$this->assertEquals( array(), $options_updated['ip']['blacklist'] );
+
+		// Verify that version number has changed to current release.
+		$this->assertEquals( StatifyBlacklist::VERSION_MAIN, $options_updated['version'] );
+	}
+}