Added tests for Issues #73. CompositeDisposable should reject constructor that provides collections with null values

Rx.NET/Source/Tests.System.Reactive/Tests/Disposables/DisposableTests.cs

@@ -224,6 +224,20 @@ namespace ReactiveTests.Tests
             Assert.IsTrue(g.Contains(d2));
         }
 
+        [TestMethod, ExpectedException(typeof(ArgumentException))]
+        public void CompositeDisposable_AddNull_via_params_ctor()
+        {
+            IDisposable d1 = null;
+            new CompositeDisposable(d1);
+        }
+        [TestMethod, ExpectedException(typeof(ArgumentException))]
+        public void CompositeDisposable_AddNull_via_IEnum_ctor()
+        {
+            IEnumerable<IDisposable> values = new IDisposable[] { null };
+            new CompositeDisposable(values);
+        }
+
+
         [TestMethod, ExpectedException(typeof(ArgumentNullException))]
         public void CompositeDisposable_AddNull()
         {