io.activej.test.rules.ClassBuilderConstantsRule Maven / Gradle / Ivy

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/*
 * 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.codegen.ClassGenerator;
import org.junit.rules.TestRule;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import static org.junit.Assert.assertEquals;

/**
 * {@link TestRule} that fails if not all static constants from the {@link ClassGenerator}'s STATIC_CONSTANTS map were removed properly.
 * 
 * Annotation {@link IgnoreLeaks} can be put on a test that wants this rule disabled.
 */
public final class ClassBuilderConstantsRule implements TestRule {
	@Override
	public Statement apply(Statement base, Description description) {
		if (description.getTestClass().getAnnotation(IgnoreLeaks.class) != null
			|| description.getAnnotation(IgnoreLeaks.class) != null) {
			return base;
		}
		return new LambdaStatement(() -> {
			ClassGenerator.clearStaticConstants();
			base.evaluate();
			assertEquals("Some static constants have not been cleaned up", 0, ClassGenerator.getStaticConstantsSize());
		});
	}

	@Retention(RetentionPolicy.RUNTIME)
	@Target({ElementType.METHOD, ElementType.TYPE})
	public @interface IgnoreLeaks {

		/**
		 * An optional description for why the test needs to ignore leaks
		 */
		String value() default "";
	}
}