use a random available port for tests

commafeed-server/src/test/java/com/commafeed/CommaFeedDropwizardAppExtension.java

@@ -5,15 +5,19 @@ import java.sql.SQLException;
 
 import javax.sql.DataSource;
 
+import org.mockserver.socket.PortFactory;
+
 import com.codahale.metrics.MetricRegistry;
 
+import io.dropwizard.testing.ConfigOverride;
 import io.dropwizard.testing.ResourceHelpers;
 import io.dropwizard.testing.junit5.DropwizardAppExtension;
 
 public class CommaFeedDropwizardAppExtension extends DropwizardAppExtension<CommaFeedConfiguration> {
 
 	public CommaFeedDropwizardAppExtension() {
-		super(CommaFeedApplication.class, ResourceHelpers.resourceFilePath("config.test.yml"));
+		super(CommaFeedApplication.class, ResourceHelpers.resourceFilePath("config.test.yml"),
+				ConfigOverride.config("server.applicationConnectors[0].port", String.valueOf(PortFactory.findFreePort())));
 	}
 
 	@Override

commafeed-server/src/test/resources/config.test.yml

@@ -119,6 +119,9 @@ database:
   validationQuery: "/* CommaFeed Health Check */ SELECT 1"
 
 server:
+  applicationConnectors:
+    - type: http
+      port: 8083
   adminConnectors: [ ]
 
 logging: