public void RelayCommandOfT_Ctor_EmptyPredicate_CanAlwaysExecute() { // Setup var command = new RelayCommand<object>(x => { }); // Act + Verify Assert.IsTrue(command.CanExecute(null)); }
public void RelayCommand_Ctor_EmptyPredicate_CanAlwaysExecute() { // Setup var command = new RelayCommand(() => { }); // Act + Verify Assert.IsTrue(command.CanExecute()); }
public void ContextualCommandViewModel_Ctor_NullArgChecks() { var command = new RelayCommand(() => { }); ContextualCommandViewModel suppressAnalysisWarning; Exceptions.Expect<ArgumentNullException>(() => { suppressAnalysisWarning = new ContextualCommandViewModel(null, command); }); }
/// <summary> /// Creates an instance of contextual command view model /// </summary> /// <param name="fixedContext">Required context</param> /// <param name="command">Optional real command to trigger and pass the fixed context to</param> public ContextualCommandViewModel(object fixedContext, ICommand command) { if (fixedContext == null) { throw new ArgumentNullException(nameof(fixedContext)); } this.fixedContext = fixedContext; this.proxyCommand = new RelayCommand(this.Execute, this.CanExecute); this.SetCommand(command); }
public void ContextualCommandViewModel_CommandInvocation() { // Setup bool canExecute = false; bool executed = false; var realCommand = new RelayCommand<object>( (state) => { Assert.AreEqual(this, state); executed = true; }, (state) => { Assert.AreEqual(this, state); return canExecute; }); var testSubject = new ContextualCommandViewModel(this, realCommand); // Sanity Assert.IsNotNull(testSubject.Command); Assert.AreSame(realCommand, testSubject.InternalRealCommand); // Case 1: Can't execute canExecute = false; // Act Assert.IsFalse(testSubject.Command.CanExecute(null), "CanExecute wasn't called as expected"); // Case 2: Can execute canExecute = true; // Act Assert.IsTrue(testSubject.Command.CanExecute(null), "CanExecute wasn't called as expected"); // Case 3: Execute // Act testSubject.Command.Execute(null); Assert.IsTrue(executed, "Execute wasn't called as expected"); }
public void ContextualCommandViewModel_DisplayText() { // Setup var context = new object(); var command = new RelayCommand(() => { }); var testSubject = new ContextualCommandViewModel(context, command); using (var tracker = new PropertyChangedTracker(testSubject)) { // Case 1: null // Act + Verify Assert.IsNull(testSubject.DisplayText, "Expected display text to return null when not set"); // Case 2: static testSubject.DisplayText = "foobar9000"; // Act + Verify Assert.AreEqual("foobar9000", testSubject.DisplayText, "Unexpected static display text"); tracker.AssertPropertyChangedRaised(nameof(testSubject.DisplayText), 1); // Case 3: dynamic var funcInvoked = false; Func<object, string> func = x => { funcInvoked = true; return "1234"; }; testSubject.SetDynamicDisplayText(func); // Act + Verify Assert.AreEqual("1234", testSubject.DisplayText, "Unexpected dynamic display text"); Assert.IsTrue(funcInvoked, "Dynamic display text function was not invoked"); tracker.AssertPropertyChangedRaised(nameof(testSubject.DisplayText), 2); } // Case 4: dynamic - null exception Exceptions.Expect<ArgumentNullException>(() => testSubject.SetDynamicDisplayText(null)); }
public void ContextualCommandViewModel_Icon() { // Setup var context = new object(); var command = new RelayCommand(() => { }); var testSubject = new ContextualCommandViewModel(context, command); using (var tracker = new PropertyChangedTracker(testSubject)) { // Case 1: null // Act + Verify Assert.IsNull(testSubject.Icon, "Expected icon to return null when not set"); // Case 2: static var staticIcon = new IconViewModel(null); testSubject.Icon = staticIcon; // Act + Verify Assert.AreSame(staticIcon, testSubject.Icon, "Unexpected static icon"); tracker.AssertPropertyChangedRaised(nameof(testSubject.Icon), 1); // Case 3: dynamic var dynamicIcon = new IconViewModel(null); var funcInvoked = false; Func<object, IconViewModel> func = x => { funcInvoked = true; return dynamicIcon; }; testSubject.SetDynamicIcon(func); // Act + Verify Assert.AreSame(dynamicIcon, testSubject.Icon, "Unexpected dynamic icon"); Assert.IsTrue(funcInvoked, "Dynamic icon function was not invoked"); tracker.AssertPropertyChangedRaised(nameof(testSubject.Icon), 2); } // Case 4: dynamic - null exception Exceptions.Expect<ArgumentNullException>(() => testSubject.SetDynamicIcon(null)); }