test(cli): add MySQL support to test utility helpers

Extends the testing infrastructure to support MySQL databases.

Adds MySQL configuration defaults and environment variable overrides.
Updates the prelude generation logic to handle MySQL connection strings and provider types, enabling broader database integration testing across the CLI.

Author: svetch

packages/cli/test/utils.ts

@@ -12,6 +12,13 @@ const TEST_PG_CONFIG = {
     password: process.env['TEST_PG_PASSWORD'] ?? 'postgres',
 };
 
+const TEST_MYSQL_CONFIG = {
+    host: process.env['TEST_MYSQL_HOST'] ?? 'localhost',
+    port: process.env['TEST_MYSQL_PORT'] ? parseInt(process.env['TEST_MYSQL_PORT']) : 3306,
+    user: process.env['TEST_MYSQL_USER'] ?? 'root',
+    password: process.env['TEST_MYSQL_PASSWORD'] ?? 'root',
+};
+
 function getTestDbName(provider: string) {
     if (provider === 'sqlite') {
         return './test.db';
@@ -34,13 +41,24 @@ function getTestDbName(provider: string) {
     );
 }
 
-export function getDefaultPrelude(options?: { provider?: 'sqlite' | 'postgresql' }) {
+export function getDefaultPrelude(options?: { provider?: 'sqlite' | 'postgresql' | 'mysql' }) {
     const provider = (options?.provider || getTestDbProvider()) ?? 'sqlite';
     const dbName = getTestDbName(provider);
-    const dbUrl =
-        provider === 'sqlite'
-            ? `file:${dbName}`
-            : `postgres://${TEST_PG_CONFIG.user}:${TEST_PG_CONFIG.password}@${TEST_PG_CONFIG.host}:${TEST_PG_CONFIG.port}/${dbName}`;
+    let dbUrl: string;
+
+    switch (provider) {
+        case 'sqlite':
+            dbUrl = `file:${dbName}`;
+            break;
+        case 'postgresql':
+            dbUrl = `postgres://${TEST_PG_CONFIG.user}:${TEST_PG_CONFIG.password}@${TEST_PG_CONFIG.host}:${TEST_PG_CONFIG.port}/${dbName}`;
+            break;
+        case 'mysql':
+            dbUrl = `mysql://${TEST_MYSQL_CONFIG.user}:${TEST_MYSQL_CONFIG.password}@${TEST_MYSQL_CONFIG.host}:${TEST_MYSQL_CONFIG.port}/${dbName}`;
+            break;
+        default:
+            throw new Error(`Unsupported provider: ${provider}`);
+    }
 
     const ZMODEL_PRELUDE = `datasource db {
   provider = "${provider}"
@@ -52,7 +70,7 @@ export function getDefaultPrelude(options?: { provider?: 'sqlite' | 'postgresql'
 
 export function createProject(
     zmodel: string,
-    options?: { customPrelude?: boolean; provider?: 'sqlite' | 'postgresql' },
+    options?: { customPrelude?: boolean; provider?: 'sqlite' | 'postgresql' | 'mysql' },
 ) {
     const workDir = createTestProject();
     fs.mkdirSync(path.join(workDir, 'zenstack'), { recursive: true });