Added some initial tests to verify configuration

.github/workflows/testing.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: ['8.2', '8.0', '7.4']
+        php-version: ["8.2", "8.0", "7.4"]
     services:
       database:
         image: mysql:latest
@@ -25,10 +25,13 @@ jobs:
       - name: Check out source code
         uses: actions/checkout@v4
 
+      - name: Install SVN
+        run: sudo apt-get update && sudo apt-get install -y subversion
+
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: $
+          php-version: ${{ matrix.php-version }}
           tools: phpunit-polyfills:1.1
 
       - name: Setup tests

package.json

@@ -21,7 +21,7 @@
     "test:php": "npm-run-all lint:php test:unit:php",
     "test:unit:php:setup": "wp-env --config .wp-env.test.json start",
     "test:unit:php:setup:debug": "wp-env --config .wp-env.test.json start --xdebug",
-    "test:unit:php:base": "wp-env --config .wp-env.test.json run --env-cwd='wp-content/plugins/rsscloud' wordpress vendor/bin/phpunit -c phpunit.xml.dist --verbose",
+    "test:unit:php:base": "wp-env --config .wp-env.test.json run --env-cwd='wp-content/plugins/rsscloud' wordpress vendor/bin/phpunit -c phpunit.xml.dist --verbose --testdox",
     "test:unit:php": "npm-run-all test:unit:php:setup test:unit:php:base",
     "test:unit:php:debug": "npm-run-all test:unit:php:setup:debug test:unit:php:base"
   }

tests/test-data-storage.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Tests for data storage functions.
+ *
+ * @package Rsscloud
+ */
+
+class DataStorageTest extends WP_UnitTestCase {
+
+	public function test_get_hub_notifications_returns_false_when_not_set() {
+		$this->assertFalse( rsscloud_get_hub_notifications() );
+	}
+
+	public function test_update_hub_notifications_stores_data() {
+		$data = array(
+			'http://example.com/feed' => array(
+				'http://example.com/rpc' => array(
+					'protocol'      => 'http-post',
+					'status'        => 'active',
+					'failure_count' => 0,
+				),
+			),
+		);
+
+		$this->assertTrue( rsscloud_update_hub_notifications( $data ) );
+		$this->assertSame( $data, rsscloud_get_hub_notifications() );
+	}
+
+	public function test_update_hub_notifications_casts_to_array() {
+		rsscloud_update_hub_notifications( 'not-an-array' );
+		$this->assertSame( array( 'not-an-array' ), rsscloud_get_hub_notifications() );
+	}
+
+	public function test_update_hub_notifications_overwrites_previous() {
+		$first  = array( 'first' => 'value' );
+		$second = array( 'second' => 'value' );
+
+		rsscloud_update_hub_notifications( $first );
+		rsscloud_update_hub_notifications( $second );
+
+		$this->assertSame( $second, rsscloud_get_hub_notifications() );
+	}
+
+	/**
+	 * This test must run after tests that write data.
+	 * It verifies that WP_UnitTestCase database isolation is working
+	 * (each test gets a clean slate via transaction rollback).
+	 */
+	public function test_database_isolation_between_tests() {
+		$this->assertFalse( rsscloud_get_hub_notifications() );
+	}
+}

tests/test-rsscloud.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * Tests for main plugin functions.
+ *
+ * @package Rsscloud
+ */
+
+class RsscloudTest extends WP_UnitTestCase {
+
+	public function test_generate_challenge_returns_string_of_expected_length() {
+		$challenge = rsscloud_generate_challenge();
+
+		$this->assertIsString( $challenge );
+		$this->assertSame( 30, strlen( $challenge ) );
+	}
+
+	public function test_generate_challenge_respects_custom_length() {
+		$this->assertSame( 50, strlen( rsscloud_generate_challenge( 50 ) ) );
+	}
+
+	public function test_generate_challenge_returns_unique_values() {
+		$first  = rsscloud_generate_challenge();
+		$second = rsscloud_generate_challenge();
+
+		$this->assertNotSame( $first, $second );
+	}
+
+	public function test_query_vars_adds_rsscloud() {
+		$vars   = array( 'existing_var' );
+		$result = rsscloud_query_vars( $vars );
+
+		$this->assertContains( 'existing_var', $result );
+		$this->assertContains( 'rsscloud', $result );
+	}
+}