public void AsyncIsExecuting()
{
asyncTestCommand = new AsyncCommand <int>(a => AsyncExecuteMethod(a));
Assert.IsFalse(asyncTestCommand.IsExecuting);
Assert.IsTrue(asyncTestCommand.CanExecute(100));
executingAsyncMethod = true;
EnqueueCallback(() => {
asyncTestCommand.Execute(100);
Assert.IsTrue(asyncTestCommand.IsExecuting);
Assert.IsFalse(asyncTestCommand.CanExecute(100));
});
EnqueWaitForAsync(asyncTestCommand.executeTask);
EnqueueWait(() => !asyncTestCommand.IsExecuting);
EnqueueWindowUpdateLayout();
Assert.IsFalse(asyncTestCommand.IsExecuting);
Assert.IsTrue(asyncTestCommand.CanExecute(100));
EnqueueConditional(() => !executingAsyncMethod);
EnqueueTestComplete();
}
public void AsyncCommand_Parameter_CanExecuteTrue_Test()
{
//Arrange
AsyncCommand <int> command = new AsyncCommand <int>(IntParameterTask, canExecute: CanExecuteTrue);
//Act
//Assert
Assert.IsTrue(command.CanExecute(null));
}
public void IAsyncCommand_Parameter_CanExecuteFalse_Test()
{
//Arrange
IAsyncCommand <int> command = new AsyncCommand <int>(IntParameterTask, CanExecuteFalse);
//Act
//Assert
Assert.False(command.CanExecute(null));
}
public void AsyncCommand_NoParameter_CanExecuteTrue_Test()
{
// Arrange
var command = new AsyncCommand(NoParameterTask, parameter => CanExecuteTrue(parameter));
// Act
// Assert
Assert.IsTrue(command.CanExecute(null));
}
public void AsyncCommand_NoParameter_CanExecuteFalse_NoParameter_Test()
{
// Arrange
var command = new AsyncCommand(NoParameterTask, () => CanExecuteFalse());
// Act
// Assert
Assert.False(command.CanExecute(null));
}
public void AsyncCommand_Parameter_CanExecuteFalse_Test()
{
// Arrange
var command = new AsyncCommand <int>(IntParameterTask, parameter => CanExecuteFalse(parameter));
// Act
// Assert
Assert.False(command.CanExecute(null));
}
public void ICommand_Parameter_CanExecuteTrue_NoParameter_Test()
{
// Arrange
ICommand command = new AsyncCommand <int>(IntParameterTask, () => CanExecuteTrue());
// Act
// Assert
Assert.IsTrue(command.CanExecute(null));
}
public async Task ICommand_NoParameter_CanExecuteChanged_DoesNotAllowMultipleExecutions_Test()
{
// Arrange
var semaphoreSlim = new SemaphoreSlim(1, 1);
var canExecuteChangedCount = 0;
var handleCanExecuteChangedTCS = new TaskCompletionSource <int>();
ICommand command = new AsyncCommand(() => IntParameterTask(Delay), allowsMultipleExecutions: false);
command.CanExecuteChanged += handleCanExecuteChanged;
async void handleCanExecuteChanged(object?sender, EventArgs e)
{
await semaphoreSlim.WaitAsync().ConfigureAwait(false);
try
{
if (++canExecuteChangedCount is 2)
{
command.CanExecuteChanged -= handleCanExecuteChanged;
handleCanExecuteChangedTCS.SetResult(canExecuteChangedCount);
}
}
finally
{
semaphoreSlim.Release();
}
}
// Act
command.Execute(null);
// Assert
Assert.False(command.CanExecute(null));
// Act
var handleCanExecuteChangedREsult = await handleCanExecuteChangedTCS.Task.ConfigureAwait(false);
// Assert
Assert.IsTrue(command.CanExecute(null));
Assert.AreEqual(2, canExecuteChangedCount);
Assert.AreEqual(canExecuteChangedCount, handleCanExecuteChangedREsult);
}
public void IAsyncCommand_NoParameter_CanExecuteTrue_Test()
{
// Arrange
IAsyncCommand command = new AsyncCommand(NoParameterTask, CanExecuteTrue);
// Act
// Assert
Assert.True(command.CanExecute(null));
}
public void AsyncCommand_NoParameter_CanExecuteFalse_Test()
{
//Arrange
AsyncCommand command = new AsyncCommand(NoParameterTask, canExecute: CanExecuteFalse);
//Act
//Assert
Assert.False(command.CanExecute(null));
}
public void IAsyncCommand_CanExecute_InvalidValueTypeParameter()
{
// Arrange
IAsyncCommand <int, string> command = new AsyncCommand <int, string>(IntParameterTask, CanExecuteTrue);
// Act
// Assert
Assert.Throws <InvalidCommandParameterException>(() => command.CanExecute(true));
}
public void IAsyncCommand_CanExecute_InvalidReferenceParameter()
{
// Arrange
IAsyncCommand <int, bool> command = new AsyncCommand <int, bool>(IntParameterTask, CanExecuteTrue);
// Act
// Assert
Assert.Throws <InvalidCommandParameterException>(() => command.CanExecute("Hello World"));
}
public void IAsyncCommand_NoParameter_CanExecuteFalse_Test()
{
// Arrange
IAsyncCommand command = new AsyncCommand(NoParameterTask, parameter => CanExecuteFalse(parameter));
// Act
// Assert
Assert.False(command.CanExecute(null));
}
public void CanExecuteCondition(bool expected)
{
using (var condition = Mock.Of <ICondition>(x => x.IsSatisfied == expected))
{
using (var command = new AsyncCommand(() => Task.FromResult(1), condition))
{
Assert.AreEqual(2, ((AndCondition)command.Condition).Prerequisites.Count);
Assert.AreEqual(expected, command.CanExecute());
}
}
}
public void WithTwoConditions()
{
var mock1 = new Mock <ICondition>(MockBehavior.Strict);
mock1.SetupGet(x => x.IsSatisfied).Returns(true);
var mock2 = new Mock <ICondition>(MockBehavior.Strict);
mock2.SetupGet(x => x.IsSatisfied).Returns(true);
using (var command = new AsyncCommand(() => Task.Run(() => { }), mock1.Object, mock2.Object))
{
Assert.IsTrue(command.CanExecute());
mock2.SetupGet(x => x.IsSatisfied).Returns(false);
Assert.IsFalse(command.CanExecute());
}
mock1.Verify(x => x.Dispose(), Times.Never);
mock2.Verify(x => x.Dispose(), Times.Never);
}
public void AsyncCommand_NoParameter_NoCanExecute_Test()
{
// Arrange
Func <bool> canExecute = null;
var command = new AsyncCommand(NoParameterTask, canExecute);
// Act
// Assert
Assert.True(command.CanExecute(null));
}
public void CanCancel()
{
using var command = new AsyncCommand <int>((i, x) => x.AsObservable().FirstAsync().ToTask());
Assert.IsTrue(command.CanExecute(0));
Assert.IsFalse(command.CancelCommand.CanExecute());
command.Execute(0);
Assert.IsTrue(command.CancelCommand.CanExecute());
command.CancelCommand.Execute();
Assert.IsFalse(command.CancelCommand.CanExecute());
Assert.IsInstanceOf <Condition>(command.Condition);
}
void AsyncCanExecuteTestCore(Func <int, Task> a)
{
asyncTestCommand = new AsyncCommand <int>(a, o => true);
asyncTestCommand.Execute(100);
Assert.IsTrue(asyncTestCommand.IsExecuting);
Assert.IsFalse(asyncTestCommand.CanExecute(100));
asyncTestCommand.Cancel();
Assert.IsTrue(asyncTestCommand.IsExecuting);
Assert.IsTrue(asyncTestCommand.ShouldCancel);
Assert.IsTrue(asyncTestCommand.IsCancellationRequested);
asyncTestCommand.Wait(latencyTime);
Assert.IsTrue(asyncTestCommand.executeTask.IsCompleted);
Assert.IsFalse(asyncTestCommand.IsExecuting);
Assert.IsTrue(asyncTestCommand.CanExecute(100));
asyncTestCommand = new AsyncCommand <int>(a, o => false);
asyncTestCommand.Execute(100);
Assert.IsFalse(asyncTestCommand.IsExecuting);
Assert.IsFalse(asyncTestCommand.CanExecute(100));
}
public void IAsyncCommand_Parameter_CanExecuteTrue_Test()
{
// Arrange
IAsyncCommand <int> command = new AsyncCommand <int>(IntParameterTask, parameter => CanExecuteTrue(parameter));
IAsyncCommand <int, bool> command2 = new AsyncCommand <int, bool>(IntParameterTask, CanExecuteTrue);
// Act
// Assert
Assert.True(command.CanExecute(null));
Assert.True(command2.CanExecute(true));
}
public void IAsyncCommand_Parameter_CanExecuteFalse_Test()
{
// Arrange
IAsyncCommand <int> command = new AsyncCommand <int>(IntParameterTask, parameter => CanExecuteFalse(parameter));
IAsyncCommand <int, string> command2 = new AsyncCommand <int, string>(IntParameterTask, CanExecuteFalse);
// Act
// Assert
Assert.False(command.CanExecute(null));
Assert.False(command2.CanExecute("Hello World"));
}
public void CanExecuteWithoutParameterTest()
{
bool canExecuteFired = false;
bool canExecute = false;
var command = new AsyncCommand(() => Task.CompletedTask, () =>
{
canExecuteFired = true;
return(canExecute);
});
Assert.False(canExecuteFired);
Assert.False(command.CanExecute(new object()));
Assert.True(canExecuteFired);
canExecuteFired = false;
canExecute = true;
Assert.True(command.CanExecute(new object()));
Assert.True(canExecuteFired);
}
public void CanCancel()
{
var tcs = new TaskCompletionSource <int>();
using var command = new AsyncCommand(x => tcs.Task);
Assert.IsTrue(command.CanExecute());
Assert.IsFalse(command.CancelCommand.CanExecute());
command.Execute();
Assert.IsTrue(command.CancelCommand.CanExecute());
command.CancelCommand.Execute();
Assert.IsFalse(command.CancelCommand.CanExecute());
Assert.IsInstanceOf <Condition>(command.Condition);
}
public async Task ExecuteAsync_CorrectExecutionWithCanExecuteChanged_Async()
{
// Arrange
var executed = false;
Task Execute()
{
executed = true;
return(Task.CompletedTask);
}
bool CanExecute() => true;
var errorHandler = new ErrorHandlerTestImplementation((cmd,
exception) =>
{
});
IAsyncCommand command = new AsyncCommand(Execute, CanExecute, errorHandler);
var invokedSenderList = new List <object>();
var invokedArgsList = new List <EventArgs>();
var invokedCanExecuteStateList = new List <bool>();
command.CanExecuteChanged += (sender,
args) =>
{
if (sender != null)
{
invokedSenderList.Add(sender);
}
if (args != null)
{
invokedArgsList.Add(args);
}
invokedCanExecuteStateList.Add(command.CanExecute());
};
// Act
await command.ExecuteAsync();
// Assert
Assert.IsTrue(executed);
Assert.AreEqual(2, invokedSenderList.Count);
Assert.AreSame(command, invokedSenderList[0]);
Assert.AreSame(command, invokedSenderList[1]);
Assert.AreEqual(2, invokedArgsList.Count);
Assert.AreSame(EventArgs.Empty, invokedArgsList[0]);
Assert.AreSame(EventArgs.Empty, invokedArgsList[1]);
Assert.AreEqual(2, invokedCanExecuteStateList.Count);
Assert.IsFalse(invokedCanExecuteStateList[0]); // Cannot execute during first execution, even when the CanExecute delegate returns true.
Assert.IsTrue(invokedCanExecuteStateList[1]); // Can execute after the execution has finished.
}
public void AsyncCommand_NoParameter_NoCanExecute_Test()
{
// Arrange
Func <bool>?canExecute = null;
#pragma warning disable CS8604 // Possible null reference argument.
var command = new AsyncCommand(NoParameterTask, canExecute);
#pragma warning restore CS8604 // Possible null reference argument.
// Act
// Assert
Assert.IsTrue(command.CanExecute(null));
}
public void ExecuteThrows()
{
var exception = new Exception();
using (var command = new AsyncCommand <int>(x => Task.Run(() => { throw exception; })))
{
command.Execute(0);
Assert.ThrowsAsync <Exception>(() => command.Execution.Task);
Assert.AreEqual(exception, command.Execution.InnerException);
Assert.AreEqual(TaskStatus.Faulted, command.Execution.Status);
Assert.AreEqual(true, command.CanExecute(0));
}
}
public void CanExecuteIsFalseIfCommandIsExecuting()
{
bool CanExecute = true;
AsyncCommand command = null;
Task action()
{
CanExecute = command.CanExecute(null); return(Task.CompletedTask);
};
command = new AsyncCommand(action);
command.Execute(null);
Assert.IsFalse(CanExecute);
}
public void CanExecuteShouldInvokeCallback()
{
// arrange
var canExecute = new Mock<Func<object, bool>>();
canExecute.Setup( f => f( It.IsAny<object>() ) ).Returns( true );
var command = new AsyncCommand<object>( p => Task.FromResult( 0 ), canExecute.Object );
// act
command.CanExecute();
// assert
canExecute.Verify( f => f( null ), Times.Once() );
}
public void CannotExecuteWhileCommandIsRunningWithoutParameterTest()
{
using (var runningSemaphore = new SemaphoreSlim(0))
using (var completionSemaphore = new SemaphoreSlim(0))
{
var command = new AsyncCommand(async() =>
{
runningSemaphore.Release();
await completionSemaphore.WaitAsync().ConfigureAwait(false);
});
Assert.True(command.CanExecute(new object()));
command.Execute(new object());
runningSemaphore.Wait();
Assert.False(command.CanExecute(new object()));
completionSemaphore.Release();
command.Execution.TaskCompleted.Wait();
Assert.True(command.CanExecute(new object()));
}
}
public async Task TestCommand_With_Condition()
{
bool isCalled = false;
bool canExecute = false;
var command = new AsyncCommand(async() =>
{
await Task.Delay(500);
isCalled = true;
}, () => canExecute);
await command.ExecuteAsync();
Assert.AreEqual(false, command.CanExecute(null));
Assert.AreEqual(false, isCalled);
canExecute = true;
await command.ExecuteAsync();
Assert.AreEqual(true, command.CanExecute(null));
Assert.AreEqual(true, isCalled);
}
public void AsyncCanExecuteTestCore(Func <int, Task> a)
{
asyncTestCommand = new AsyncCommand <int>(a, o => true);
EnqueueCallback(() => {
asyncTestCommand.Execute(100);
Assert.IsTrue(asyncTestCommand.IsExecuting);
Assert.IsFalse(asyncTestCommand.CanExecute(100));
asyncTestCommand.Cancel();
Assert.IsTrue(asyncTestCommand.IsExecuting);
Assert.IsTrue(asyncTestCommand.ShouldCancel);
Assert.IsTrue(asyncTestCommand.IsCancellationRequested);
});
EnqueueWait(() => asyncTestCommand.executeTask.IsCompleted);
EnqueueWait(() => !asyncTestCommand.IsExecuting);
EnqueueCallback(() => {
Assert.IsFalse(asyncTestCommand.IsExecuting);
Assert.IsTrue(asyncTestCommand.CanExecute(100));
asyncTestCommand = new AsyncCommand <int>(a, o => false);
asyncTestCommand.Execute(100);
Assert.IsFalse(asyncTestCommand.IsExecuting);
Assert.IsFalse(asyncTestCommand.CanExecute(100));
});
EnqueueTestComplete();
}
public void CanExecuteWithoutParameterWithoutDelegateIsTrueByDefaultTest()
{
bool executeFired = false;
var command = new AsyncCommand(() =>
{
executeFired = true;
return(Task.CompletedTask);
});
Assert.True(command.CanExecute(new object()));
Assert.False(executeFired);
command.Execute(new object());
Assert.True(executeFired);
}