Test MySQL JDBC URL verification

plugin/trino-mysql/src/test/java/io/trino/plugin/mysql/TestMySqlJdbcConfig.java

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+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.trino.plugin.mysql;
+
+import org.testng.annotations.Test;
+
+import static org.testng.Assert.assertFalse;
+import static org.testng.Assert.assertTrue;
+
+public class TestMySqlJdbcConfig
+{
+    @Test
+    public void testIsUrlWithoutDatabase()
+    {
+        assertTrue(isUrlWithoutDatabase("jdbc:mysql://example.net:3306"));
+        assertTrue(isUrlWithoutDatabase("jdbc:mysql://example.net:3306/"));
+        assertFalse(isUrlWithoutDatabase("jdbc:mysql://example.net:3306/somedatabase"));
+    }
+
+    private static boolean isUrlWithoutDatabase(String url)
+    {
+        MySqlJdbcConfig config = new MySqlJdbcConfig();
+        config.setConnectionUrl(url);
+        return config.isUrlWithoutDatabase();
+    }
+}