Add tests for Nodeinfo main class

Tests cover:
- Singleton pattern behavior
- REST routes registration
- Integration registration
- Rewrite rules
- Deprecated filter handling
- WebFinger and admin hooks registration

Author: pfefferle

tests/phpunit/tests/class-test-nodeinfo.php

@@ -0,0 +1,137 @@
+<?php
+/**
+ * Test Nodeinfo main class.
+ *
+ * @package Nodeinfo
+ */
+
+namespace Nodeinfo\Tests;
+
+/**
+ * Test class for the main Nodeinfo class.
+ *
+ * @coversDefaultClass \Nodeinfo\Nodeinfo
+ */
+class Test_Nodeinfo extends \WP_UnitTestCase {
+
+	/**
+	 * Test that get_instance returns same instance (singleton).
+	 *
+	 * @covers ::get_instance
+	 */
+	public function test_singleton_pattern() {
+		$instance1 = \Nodeinfo\Nodeinfo::get_instance();
+		$instance2 = \Nodeinfo\Nodeinfo::get_instance();
+
+		$this->assertSame( $instance1, $instance2 );
+	}
+
+	/**
+	 * Test that get_instance returns Nodeinfo instance.
+	 *
+	 * @covers ::get_instance
+	 */
+	public function test_get_instance_returns_nodeinfo() {
+		$instance = \Nodeinfo\Nodeinfo::get_instance();
+
+		$this->assertInstanceOf( \Nodeinfo\Nodeinfo::class, $instance );
+	}
+
+	/**
+	 * Test that REST routes are registered.
+	 *
+	 * @covers ::register_routes
+	 */
+	public function test_rest_routes_registered() {
+		global $wp_rest_server;
+
+		$wp_rest_server = new \WP_REST_Server();
+		do_action( 'rest_api_init' );
+
+		$routes = $wp_rest_server->get_routes();
+
+		$this->assertArrayHasKey( '/nodeinfo/discovery', $routes );
+		$this->assertArrayHasKey( '/nodeinfo2/1.0', $routes );
+
+		$wp_rest_server = null;
+	}
+
+	/**
+	 * Test that integrations register nodeinfo_versions filter.
+	 *
+	 * @covers ::register_integrations
+	 */
+	public function test_integrations_register_versions() {
+		$versions = apply_filters( 'nodeinfo_versions', array() );
+
+		$this->assertContains( '1.0', $versions );
+		$this->assertContains( '1.1', $versions );
+		$this->assertContains( '2.0', $versions );
+		$this->assertContains( '2.1', $versions );
+		$this->assertContains( '2.2', $versions );
+	}
+
+	/**
+	 * Test that rewrite rules are added.
+	 *
+	 * @covers ::add_rewrite_rules
+	 */
+	public function test_rewrite_rules_added() {
+		global $wp_rewrite;
+
+		// Flush rules to ensure they're registered.
+		\Nodeinfo\Nodeinfo::get_instance()->add_rewrite_rules();
+		$wp_rewrite->flush_rules();
+
+		$rules = $wp_rewrite->wp_rewrite_rules();
+
+		$this->assertArrayHasKey( '^.well-known/nodeinfo', $rules );
+		$this->assertArrayHasKey( '^.well-known/x-nodeinfo2', $rules );
+	}
+
+	/**
+	 * Test deprecated wellknown_nodeinfo_data filter triggers deprecation.
+	 *
+	 * @covers ::deprecated_wellknown_nodeinfo_data
+	 */
+	public function test_deprecated_filter_triggers_notice() {
+		// Add a callback to the deprecated filter.
+		add_filter(
+			'wellknown_nodeinfo_data',
+			function ( $data ) {
+				$data['test'] = 'value';
+				return $data;
+			}
+		);
+
+		// Expect a deprecation notice.
+		$this->setExpectedDeprecated( 'wellknown_nodeinfo_data' );
+
+		// Trigger the filter chain.
+		$discovery = apply_filters( 'nodeinfo_discovery', array( 'links' => array() ) );
+
+		// Verify the deprecated filter was applied.
+		$this->assertArrayHasKey( 'test', $discovery );
+		$this->assertEquals( 'value', $discovery['test'] );
+	}
+
+	/**
+	 * Test WebFinger filter is registered.
+	 *
+	 * @covers ::register_hooks
+	 */
+	public function test_webfinger_filter_registered() {
+		$this->assertTrue( has_filter( 'webfinger_user_data' ) !== false );
+		$this->assertTrue( has_filter( 'webfinger_post_data' ) !== false );
+		$this->assertTrue( has_filter( 'host_meta' ) !== false );
+	}
+
+	/**
+	 * Test admin hooks are registered.
+	 *
+	 * @covers ::register_admin_hooks
+	 */
+	public function test_admin_hooks_registered() {
+		$this->assertTrue( has_action( 'admin_init' ) !== false );
+	}
+}