Issue 329: Fix non-deterministic unit tests

rxjava-core/src/main/java/rx/operators/OperationGroupBy.java

@@ -548,8 +548,8 @@ public void onNext(String outputMessage) {
             // sentEvents will go until 'eventCounter' hits 20 and then unsubscribes
             // which means it will also send (but ignore) the 19/20 events for the other group
             // It will not however send all 100 events.
-            assertEquals(39, sentEventCounter.get(), 2);
-            // gave it a delta of 2 so the threading/unsubscription race has wiggle 
+            assertEquals(39, sentEventCounter.get(), 10);
+            // gave it a delta of 10 to account for the threading/unsubscription race condition which can vary depending on a machines performance, thread-scheduler, etc
         }
 
         private static class Event {

rxjava-core/src/main/java/rx/operators/OperationMaterialize.java

@@ -19,6 +19,7 @@
 
 import java.util.List;
 import java.util.Vector;
+import java.util.concurrent.ExecutionException;
 
 import org.junit.Test;
 
@@ -139,25 +140,13 @@ public void testMaterialize2() {
         }
 
         @Test
-        public void testMultipleSubscribes() {
-            final TestAsyncErrorObservable o1 = new TestAsyncErrorObservable("one", "two", null, "three");
-
-            Observable<Notification<String>> m = Observable.create(materialize(o1));
-
-            TestObserver Observer1 = new TestObserver();
-            m.subscribe(Observer1);
-
-            TestObserver Observer2 = new TestObserver();
-            m.subscribe(Observer2);
+        public void testMultipleSubscribes() throws InterruptedException, ExecutionException {
+            final TestAsyncErrorObservable o = new TestAsyncErrorObservable("one", "two", null, "three");
 
-            try {
-                o1.t.join();
-            } catch (InterruptedException e) {
-                throw new RuntimeException(e);
-            }
+            Observable<Notification<String>> m = Observable.create(materialize(o));
 
-            assertEquals(3, Observer1.notifications.size());
-            assertEquals(3, Observer2.notifications.size());
+            assertEquals(3, m.toList().toBlockingObservable().toFuture().get().size());
+            assertEquals(3, m.toList().toBlockingObservable().toFuture().get().size());
         }
 
     }
@@ -193,7 +182,7 @@ private static class TestAsyncErrorObservable extends Observable<String> {
             valuesToReturn = values;
         }
 
-        Thread t;
+        volatile Thread t;
 
         @Override
         public Subscription subscribe(final Observer<String> observer) {

rxjava-core/src/main/java/rx/operators/OperationNext.java

@@ -27,6 +27,7 @@
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -313,6 +314,8 @@ private static class TestException extends RuntimeException {
         @Test
         public void testNoBufferingOrBlockingOfSequence() throws Throwable {
             final CountDownLatch finished = new CountDownLatch(1);
+            final int COUNT = 30;
+            final CountDownLatch timeHasPassed = new CountDownLatch(COUNT);
             final AtomicBoolean running = new AtomicBoolean(true);
             final AtomicInteger count = new AtomicInteger(0);
             final Observable<Integer> obs = Observable.create(new Func1<Observer<Integer>, Subscription>() {
@@ -326,7 +329,7 @@ public void run() {
                             try {
                                 while (running.get()) {
                                     o.onNext(count.incrementAndGet());
-                                    Thread.sleep(0, 100);
+                                    timeHasPassed.countDown();
                                 }
                                 o.onCompleted();
                             } catch (Throwable e) {
@@ -350,19 +353,14 @@ public void run() {
             // we should have a different value
             assertTrue("a and b should be different", a != b);
 
-            // wait for some time
-            Thread.sleep(100);
-            // make sure the counter in the observable has increased beyond b
-            while (count.get() <= (b + 10)) {
-                Thread.sleep(100);
-            }
+            // wait for some time (if times out we are blocked somewhere so fail ... set very high for very slow, constrained machines)
+            timeHasPassed.await(8000, TimeUnit.MILLISECONDS);
 
             assertTrue(it.hasNext());
-            int expectedHigherThan = count.get();
             int c = it.next();
 
             assertTrue("c should not just be the next in sequence", c != (b + 1));
-            assertTrue("expected that c [" + c + "] is higher than " + expectedHigherThan, c > expectedHigherThan);
+            assertTrue("expected that c [" + c + "] is higher than or equal to " + COUNT, c >= COUNT);
 
             assertTrue(it.hasNext());
 

rxjava-core/src/main/java/rx/plugins/RxJavaPlugins.java

@@ -153,33 +153,27 @@ private static Object getPluginImplementationViaProperty(Class<?> pluginClass) {
 
     public static class UnitTest {
 
-        @After
-        @Before
-        public void reset() {
-            // use private access to reset so we can test different initializations via the public static flow
-            RxJavaPlugins.getInstance().errorHandler.set(null);
-            RxJavaPlugins.getInstance().observableExecutionHook.set(null);
-        }
-
         @Test
         public void testErrorHandlerDefaultImpl() {
-            RxJavaErrorHandler impl = RxJavaPlugins.getInstance().getErrorHandler();
+            RxJavaErrorHandler impl = new RxJavaPlugins().getErrorHandler();
             assertTrue(impl instanceof RxJavaErrorHandlerDefault);
         }
 
         @Test
         public void testErrorHandlerViaRegisterMethod() {
-            RxJavaPlugins.getInstance().registerErrorHandler(new RxJavaErrorHandlerTestImpl());
-            RxJavaErrorHandler impl = RxJavaPlugins.getInstance().getErrorHandler();
+            RxJavaPlugins p = new RxJavaPlugins();
+            p.registerErrorHandler(new RxJavaErrorHandlerTestImpl());
+            RxJavaErrorHandler impl = p.getErrorHandler();
             assertTrue(impl instanceof RxJavaErrorHandlerTestImpl);
         }
 
         @Test
         public void testErrorHandlerViaProperty() {
             try {
+                RxJavaPlugins p = new RxJavaPlugins();
                 String fullClass = getFullClassNameForTestClass(RxJavaErrorHandlerTestImpl.class);
                 System.setProperty("rxjava.plugin.RxJavaErrorHandler.implementation", fullClass);
-                RxJavaErrorHandler impl = RxJavaPlugins.getInstance().getErrorHandler();
+                RxJavaErrorHandler impl = p.getErrorHandler();
                 assertTrue(impl instanceof RxJavaErrorHandlerTestImpl);
             } finally {
                 System.clearProperty("rxjava.plugin.RxJavaErrorHandler.implementation");
@@ -193,23 +187,26 @@ public static class RxJavaErrorHandlerTestImpl extends RxJavaErrorHandler {
 
         @Test
         public void testObservableExecutionHookDefaultImpl() {
-            RxJavaObservableExecutionHook impl = RxJavaPlugins.getInstance().getObservableExecutionHook();
+            RxJavaPlugins p = new RxJavaPlugins();
+            RxJavaObservableExecutionHook impl = p.getObservableExecutionHook();
             assertTrue(impl instanceof RxJavaObservableExecutionHookDefault);
         }
 
         @Test
         public void testObservableExecutionHookViaRegisterMethod() {
-            RxJavaPlugins.getInstance().registerObservableExecutionHook(new RxJavaObservableExecutionHookTestImpl());
-            RxJavaObservableExecutionHook impl = RxJavaPlugins.getInstance().getObservableExecutionHook();
+            RxJavaPlugins p = new RxJavaPlugins();
+            p.registerObservableExecutionHook(new RxJavaObservableExecutionHookTestImpl());
+            RxJavaObservableExecutionHook impl = p.getObservableExecutionHook();
             assertTrue(impl instanceof RxJavaObservableExecutionHookTestImpl);
         }
 
         @Test
         public void testObservableExecutionHookViaProperty() {
             try {
+                RxJavaPlugins p = new RxJavaPlugins();
                 String fullClass = getFullClassNameForTestClass(RxJavaObservableExecutionHookTestImpl.class);
                 System.setProperty("rxjava.plugin.RxJavaObservableExecutionHook.implementation", fullClass);
-                RxJavaObservableExecutionHook impl = RxJavaPlugins.getInstance().getObservableExecutionHook();
+                RxJavaObservableExecutionHook impl = p.getObservableExecutionHook();
                 assertTrue(impl instanceof RxJavaObservableExecutionHookTestImpl);
             } finally {
                 System.clearProperty("rxjava.plugin.RxJavaErrorHandler.implementation");

rxjava-core/src/test/java/rx/concurrency/TestSchedulers.java

@@ -306,12 +306,7 @@ public Subscription call(Scheduler scheduler, BooleanSubscription cancel) {
                         observer.onNext(42);
                         latch.countDown();
 
-                        try {
-                            Thread.sleep(1);
-                        } catch (InterruptedException e) {
-                            e.printStackTrace();
-                        }
-
+                        // this will recursively schedule this task for execution again
                         scheduler.schedule(cancel, this);
 
                         return cancel;
@@ -353,7 +348,8 @@ public void onNext(Integer args) {
             fail("Timed out waiting on completion latch");
         }
 
-        assertEquals(10, count.get()); // wondering if this could be 11 in a race condition (which would be okay due to how unsubscribe works ... just it would make this test non-deterministic)
+        // the count can be 10 or higher due to thread scheduling of the unsubscribe vs the scheduler looping to emit the count
+        assertTrue(count.get() >= 10);
         assertTrue(completed.get());
     }