Introduce rollbackBeforeClose property and AutoCloseable implementation

Closes gh-27249

spring-jdbc/src/test/java/org/springframework/jdbc/datasource/SingleConnectionDataSourceTests.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2002-2023 the original author or authors.
+ *
+ * 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
+ *
+ *      https://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 org.springframework.jdbc.datasource;
+
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.Properties;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+/**
+ * @author Juergen Hoeller
+ * @since 6.1.2
+ */
+public class SingleConnectionDataSourceTests {
+
+	private final Connection connection = mock();
+
+
+	@Test
+	public void plainConnection() throws Exception {
+		SingleConnectionDataSource ds = new SingleConnectionDataSource(connection, false);
+
+		ds.getConnection().close();
+		verify(connection, times(1)).close();
+	}
+
+	@Test
+	public void withAutoCloseable() throws Exception {
+		try (SingleConnectionDataSource ds = new SingleConnectionDataSource(connection, false)) {
+			ds.getConnection();
+		}
+
+		verify(connection, times(1)).close();
+	}
+
+	@Test
+	public void withSuppressClose() throws Exception {
+		SingleConnectionDataSource ds = new SingleConnectionDataSource(connection, true);
+
+		ds.getConnection().close();
+		verify(connection, never()).close();
+
+		ds.destroy();
+		verify(connection, times(1)).close();
+
+		given(connection.isClosed()).willReturn(true);
+		assertThatExceptionOfType(SQLException.class).isThrownBy(ds::getConnection);
+	}
+
+	@Test
+	public void withRollbackBeforeClose() throws Exception {
+		SingleConnectionDataSource ds = new SingleConnectionDataSource(connection, true);
+		ds.setRollbackBeforeClose(true);
+
+		ds.destroy();
+		verify(connection, times(1)).rollback();
+		verify(connection, times(1)).close();
+	}
+
+	@Test
+	public void withEnforcedAutoCommit() throws Exception {
+		SingleConnectionDataSource ds = new SingleConnectionDataSource() {
+			@Override
+			protected Connection getConnectionFromDriverManager(String url, Properties props) {
+				return connection;
+			}
+		};
+		ds.setUrl("url");
+		ds.setAutoCommit(true);
+
+		ds.getConnection();
+		verify(connection, times(1)).setAutoCommit(true);
+
+		ds.destroy();
+		verify(connection, times(1)).close();
+	}
+
+}