content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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
   *
   * http://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 io.activej.test.rules;
  
  import io.activej.test.TestUtils;
  import org.junit.rules.TestRule;
  import org.junit.runner.Description;
  import org.junit.runners.model.Statement;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import static org.junit.Assert.assertEquals;
  
  /**
   * {@link TestRule} that fails if not all active promises have been completed either successfully or exceptionally.
   * Promises to be monitored should have either a {@link TestUtils#assertCompleteFn()}
   * listener attached
   */
  public final class ActivePromisesRule implements TestRule {
  	private static final Logger logger = LoggerFactory.getLogger(ActivePromisesRule.class);
  
  	@Override
  	public Statement apply(Statement base, Description description) {
  		return new LambdaStatement(() -> {
  			TestUtils.clearActivePromises();
  			try {
  				base.evaluate();
  			} catch (Throwable t) {
  				int n = TestUtils.getActivePromises();
  				if (n != 0) {
  					logger.info("{} promise assertion{} not checked", n, (n == 1 ? " was" : "s were"));
  				}
  				throw t;
  			}
  			assertEquals("Some promises have not been completed", 0, TestUtils.getActivePromises());
  		});
  	}
  }
  