test: add and use a mocked DatabaseConfig

Signed-off-by: David Mehren <git@herrmehren.de>

src/config/mock/database.config.mock.ts

@@ -0,0 +1,22 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { registerAs } from '@nestjs/config';
+
+import { DatabaseDialect } from '../database-dialect.enum';
+import { DatabaseConfig } from '../database.config';
+
+export default registerAs(
+  'databaseConfig',
+  (): DatabaseConfig => ({
+    dialect: (process.env.HEDGEDOC_TEST_DB_TYPE || 'sqlite') as DatabaseDialect,
+    database: 'hedgedoc',
+    password: 'hedgedoc',
+    host: 'localhost',
+    port: 0,
+    storage: '',
+    username: 'hedgedoc',
+  }),
+);