Add tests for TC_DAEMON parameter

modules/jdbc-test/src/test/java/org/testcontainers/jdbc/DatabaseDriverTest.java

@@ -0,0 +1,48 @@
+package org.testcontainers.jdbc;
+
+import org.junit.AfterClass;
+import org.junit.Test;
+import org.testcontainers.containers.JdbcDatabaseContainer;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+import static org.rnorth.visibleassertions.VisibleAssertions.*;
+
+/**
+ * Created by inikolaev on 08/06/2017.
+ */
+public class DatabaseDriverTest {
+    @AfterClass
+    public static void testCleanup() {
+        ContainerDatabaseDriver.killContainers();
+    }
+
+    @Test
+    public void shouldStopContainerWhenAllConnectionsClosed() throws SQLException {
+        final String jdbcUrl = "jdbc:tc:postgresql://hostname/databasename";
+
+        getConnectionAndClose(jdbcUrl);
+
+        JdbcDatabaseContainer<?> container = ContainerDatabaseDriver.getContainer(jdbcUrl);
+        assertNull("Database container instance is null as expected", container);
+    }
+
+    @Test
+    public void shouldNotStopDaemonContainerWhenAllConnectionsClosed() throws SQLException {
+        final String jdbcUrl = "jdbc:tc:postgresql://hostname/databasename?TC_DAEMON=true";
+
+        getConnectionAndClose(jdbcUrl);
+
+        JdbcDatabaseContainer<?> container = ContainerDatabaseDriver.getContainer(jdbcUrl);
+        assertNotNull("Database container instance is not null as expected", container);
+        assertTrue("Database container is running as expected", container.isRunning());
+    }
+
+    private void getConnectionAndClose(String jdbcUrl) throws SQLException {
+        try (Connection connection = DriverManager.getConnection(jdbcUrl)) {
+            assertNotNull("Obtained connection as expected", connection);
+        }
+    }
+}

modules/jdbc/src/main/java/org/testcontainers/jdbc/ContainerDatabaseDriver.java

@@ -1,5 +1,6 @@
 package org.testcontainers.jdbc;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Charsets;
 import com.google.common.io.Resources;
 import org.slf4j.LoggerFactory;
@@ -317,4 +318,16 @@ public static void killContainer(String jdbcUrl) {
             }
         }
     }
+
+    /**
+     * Utility method to get an instance of a database container given its JDBC URL.
+     * @param jdbcUrl the JDBC URL of the container instance to get
+     * @return an instance of database container or <code>null</code> if no container associated with JDBC URL
+     */
+    @VisibleForTesting
+    public static JdbcDatabaseContainer getContainer(String jdbcUrl) {
+        synchronized (jdbcUrlContainerCache) {
+            return jdbcUrlContainerCache.get(jdbcUrl);
+        }
+    }
 }