MySQL root access is difficult to obtain

modules/mysql/src/test/java/org/testcontainers/containers/MySQLRootAccessTest.java

@@ -0,0 +1,74 @@
+package org.testcontainers.containers;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.testcontainers.containers.output.Slf4jLogConsumer;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+@Slf4j
+@RunWith(Parameterized.class)
+public class MySQLRootAccessTest {
+
+    @Parameterized.Parameters(name = "{0}")
+    public static String[] params() {
+        return new String[]{
+            "mysql:8",
+            "mysql:5.7.22"
+        };
+    }
+
+    @Parameterized.Parameter()
+    public String image;
+
+    @Test
+    // Fails with 8 - cannot create duplicate root account
+    public void testEasyRootAccountCreation() throws SQLException {
+        try (MySQLContainer<?> db = new MySQLContainer<>(image)
+            .withUsername("root")
+            .withPassword("test")
+            .withLogConsumer(new Slf4jLogConsumer(log))) {
+            db.start();
+
+            Connection connection = DriverManager.getConnection(db.getJdbcUrl(), db.getUsername(), db.getPassword());
+            connection.createStatement().execute("SELECT 1");
+            connection.createStatement().execute("set sql_log_bin=0");
+        }
+    }
+
+    @Test
+    // Fails with both, because db.getUsername() == "test" and we're trying to execute a root-only action
+    public void testEnvVarOnlyRootAccountCreation() throws SQLException {
+        try (MySQLContainer<?> db = new MySQLContainer<>(image)
+            .withUsername("test")
+            .withPassword("test")
+            .withEnv("MYSQL_ROOT_PASSWORD", "test")
+            .withLogConsumer(new Slf4jLogConsumer(log))) {
+            db.start();
+
+            Connection connection = DriverManager.getConnection(db.getJdbcUrl(), db.getUsername(), db.getPassword());
+            connection.createStatement().execute("SELECT 1");
+            connection.createStatement().execute("set sql_log_bin=0");
+        }
+    }
+
+    @Test
+    // Works with both
+    public void testEnvVarOnlyRootAccountCreationAndHardcodedUser() throws SQLException {
+        try (MySQLContainer<?> db = new MySQLContainer<>(image)
+            .withUsername("test")
+            .withPassword("test")
+            .withEnv("MYSQL_ROOT_PASSWORD", "test")
+            .withLogConsumer(new Slf4jLogConsumer(log))) {
+            db.start();
+
+            Connection connection = DriverManager.getConnection(db.getJdbcUrl(), "root", "test");
+            connection.createStatement().execute("SELECT 1");
+            connection.createStatement().execute("set sql_log_bin=0");
+        }
+    }
+}