Remove unused MongoDbRule

spring-statemachine-data/mongodb/src/test/java/org/springframework/statemachine/data/mongodb/MongoDbRule.java

@@ -1,46 +0,0 @@
-/*
- * Copyright 2016-2020 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.statemachine.data.mongodb;
-
-import org.junit.rules.TestWatcher;
-import org.junit.runner.Description;
-import org.junit.runners.model.Statement;
-import org.springframework.util.SocketUtils;
-
-/**
- * Rule skipping tests if MongoDb is not available from localhost simply by
- * checking if port can be bind.
- *
- * @author Janne Valkealahti
- *
- */
-public class MongoDbRule extends TestWatcher {
-
-	@Override
-	public Statement apply(Statement base, Description description) {
-
-		try {
-			SocketUtils.findAvailableTcpPort(27017, 27017);
-			return super.apply(new Statement() {
-				@Override
-				public void evaluate() throws Throwable {
-				}
-			}, Description.EMPTY);
-		} catch (Exception e) {
-			return super.apply(base, description);
-		}
-	}
-}