public void TryGetTestExtensionShouldThrowExceptionWithNullUri() { testExtensionManager = new DummyTestExtensionManager(unfilteredTestExtensions, filteredTestExtensions, messageLogger); TestPluginCacheTests.SetupMockAdditionalPathExtensions(); Assert.ThrowsException <ArgumentNullException>(() => { var result = testExtensionManager.TryGetTestExtension(default(Uri)); } ); }