111 lines
4.1 KiB
C#
111 lines
4.1 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT license.
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// See the LICENSE file in the project root for more information.
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using System;
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using CommunityToolkit.Mvvm.Input;
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using CommunityToolkit.Mvvm.UnitTests.Helpers;
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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namespace CommunityToolkit.Mvvm.UnitTests;
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[TestClass]
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public class Test_RelayCommandOfT
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{
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[TestMethod]
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public void Test_RelayCommandOfT_AlwaysEnabled()
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{
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string? text = string.Empty;
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RelayCommand<string>? command = new(s => text = s);
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Assert.IsTrue(command.CanExecute("Text"));
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Assert.IsTrue(command.CanExecute(null));
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.CanExecute(new object()), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.CanExecute(42), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute(new object()), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute(42), "parameter");
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(object?, EventArgs?) args = default;
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command.CanExecuteChanged += (s, e) => args = (s, e);
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command.NotifyCanExecuteChanged();
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Assert.AreSame(args.Item1, command);
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Assert.AreSame(args.Item2, EventArgs.Empty);
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command.Execute((object)"Hello");
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Assert.AreEqual(text, "Hello");
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command.Execute(null);
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Assert.AreEqual(text, null);
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}
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[TestMethod]
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public void Test_RelayCommand_WithCanExecuteFunction()
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{
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string? text = string.Empty;
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RelayCommand<string>? command = new(s => text = s, s => s != null);
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Assert.IsTrue(command.CanExecute("Text"));
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Assert.IsFalse(command.CanExecute(null));
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.CanExecute(new object()), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.CanExecute(42), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute(new object()), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute(42), "parameter");
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command.Execute((object)"Hello");
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Assert.AreEqual(text, "Hello");
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command.Execute(null);
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// Logic is unconditionally invoked, the caller should check CanExecute first
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Assert.IsNull(text);
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}
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[TestMethod]
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public void Test_RelayCommand_InvalidArgumentWithValueType()
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{
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int n = 0;
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RelayCommand<int>? command = new(i => n = i);
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// Special case
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Assert.IsFalse(command.CanExecute(null));
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.CanExecute("Hello"), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.CanExecute(3.14f), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute(null), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute("Hello"), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute(3.14f), "parameter");
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}
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[TestMethod]
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public void Test_RelayCommand_InvalidArgumentWithValueType_WithCanExecute()
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{
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int n = 0;
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RelayCommand<int>? command = new(i => n = i, i => i > 0);
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// Special case
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Assert.IsFalse(command.CanExecute(null));
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.CanExecute("Hello"), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.CanExecute(3.14f), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute(null), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute("Hello"), "parameter");
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ExceptionHelper.ThrowsArgumentExceptionWithParameterName(() => command.Execute(3.14f), "parameter");
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}
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}
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