Add Future assertions examples

assertions-examples/src/test/java/org/assertj/examples/FutureAssertionsExamples.java

@@ -0,0 +1,61 @@
+/**
+ * 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.
+ *
+ * Copyright 2012-2016 the original author or authors.
+ */
+package org.assertj.examples;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+import org.junit.Test;
+
+/**
+ * {@link Future} assertions example.
+ * 
+ * @author Joel Costigliola
+ */
+public class FutureAssertionsExamples extends AbstractAssertionsExamples {
+
+  @Test
+  public void future_assertions_examples() {
+
+    ExecutorService executorService = Executors.newSingleThreadExecutor();
+
+    Future<String> future = executorService.submit(new Callable<String>() {
+      @Override
+      public String call() throws Exception {
+        return "done";
+      }
+    });
+
+    assertThat(future).isDone()
+                      .isNotCancelled();
+
+    future = executorService.submit(new Callable<String>() {
+      @Override
+      public String call() throws Exception {
+        Thread.sleep(1000);
+        return "done";
+      }
+    });
+
+    assertThat(future).isNotDone()
+                      .isNotCancelled();
+    future.cancel(true);
+    assertThat(future).isCancelled();
+
+  }
+
+}