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 * SciJava library facilitating consistent parallel processing.
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package org.scijava.concurrent;

import org.junit.jupiter.api.Test;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertInstanceOf;

/**
 * Tests {@link TaskExecutors}.
 *
 * @author Matthias Arzt
 */
public class TaskExecutorsTest {

	@Test
	public void testSingleThreaded() {
		TaskExecutor executor = TaskExecutors.singleThreaded();
		assertInstanceOf(TaskExecutors.SequentialTaskExecutor.class, executor);
	}

	@Test
	public void testMultiThreaded() {
		TaskExecutor executor = TaskExecutors.multiThreaded();
		assertInstanceOf(TaskExecutors.ForkJoinExecutorService.class,
			executor.getExecutorService());
	}

	@Test
	public void testNumThreads() {
		TaskExecutor executor = TaskExecutors.numThreads(2);
		assertEquals(2, executor.getParallelism());
		executor.getExecutorService().shutdown();
	}

	@Test
	public void testForExecutorService() {
		ExecutorService executorService = Executors.newFixedThreadPool(2);
		TaskExecutor executor = TaskExecutors.forExecutorService(executorService);
		assertEquals(executorService, executor.getExecutorService());
		executorService.shutdown();
	}

	@Test
	public void testForExecutorServiceAndNumThreads() {
		ExecutorService executorService = Executors.newFixedThreadPool(2);
		TaskExecutor executor = TaskExecutors.forExecutorServiceAndNumThreads(
			executorService, 42);
		assertEquals(executorService, executor.getExecutorService());
		assertEquals(42, executor.getParallelism());
		executorService.shutdown();
	}

	@Test
	public void testForExecutorServiceAndNumTasks() {
		ExecutorService executorService = Executors.newFixedThreadPool(2);
		TaskExecutor executor = TaskExecutors.forExecutorServiceAndNumTasks(
			executorService, 42);
		assertEquals(executorService, executor.getExecutorService());
		assertEquals(2, executor.getParallelism());
		assertEquals(42, executor.suggestNumberOfTasks());
	}
}
