Awaitility quick demo code

awaitility-demo.java

* Java source, ASCII text
import org.apache.commons.io.FileUtils;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import javax.annotation.Nonnull;
import java.io.File;
import java.io.IOException;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static org.awaitility.Awaitility.await;

public class AwaitilityDummyExampleTest {

   @Test
    public void demo() throws Exception {

       await().atMost(1, TimeUnit.SECONDS)
               .pollInterval(50, TimeUnit.MILLISECONDS)
               .until(() -> asyncResource.length() > 0);

    }

    @Rule
    public TemporaryFolder folder = new TemporaryFolder();

    @Nonnull
    File asyncResource;
    private int MAX_WAIT_BEFORE_WRITE_MILLISECONDS = 10 * 1000;

    /**
     * Will wait a random amount of time, max MAX_WAIT + 1 second, before writing into {@link #asyncResource}
     */
    @Before
    public void fakeAsyncDemo() throws IOException {
        asyncResource = folder.newFile();
        new Thread() {
            @Override
            public void run() {
                try {
                    Thread.sleep(1000);

                    // Sleep up to 10 seconds before writing into the file
                    final int millis = new Random(System.currentTimeMillis()).nextInt(
                            MAX_WAIT_BEFORE_WRITE_MILLISECONDS);
                    System.err.println("Sleeping for "+millis+" ms");
                    Thread.sleep(millis);
                    FileUtils.writeStringToFile(asyncResource, "blah");
                } catch (Exception e) {
                    throw new IllegalStateException(e);
                }
            }
        }.start();
    }

}