81 lines
2.0 KiB
C#
81 lines
2.0 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 Microsoft.VisualStudio.TestTools.UnitTesting;
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namespace CommunityToolkit.Mvvm.UnitTests;
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[TestClass]
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public class Test_RelayCommand
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{
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[TestMethod]
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public void Test_RelayCommand_AlwaysEnabled()
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{
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int ticks = 0;
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RelayCommand? command = new(() => ticks++);
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Assert.IsTrue(command.CanExecute(null));
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Assert.IsTrue(command.CanExecute(new object()));
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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(null);
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Assert.AreEqual(ticks, 1);
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command.Execute(new object());
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Assert.AreEqual(ticks, 2);
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}
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[TestMethod]
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public void Test_RelayCommand_WithCanExecuteFunctionTrue()
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{
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int ticks = 0;
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RelayCommand? command = new(() => ticks++, () => true);
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Assert.IsTrue(command.CanExecute(null));
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Assert.IsTrue(command.CanExecute(new object()));
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command.Execute(null);
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Assert.AreEqual(ticks, 1);
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command.Execute(new object());
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Assert.AreEqual(ticks, 2);
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}
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[TestMethod]
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public void Test_RelayCommand_WithCanExecuteFunctionFalse()
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{
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int ticks = 0;
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RelayCommand? command = new(() => ticks++, () => false);
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Assert.IsFalse(command.CanExecute(null));
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Assert.IsFalse(command.CanExecute(new object()));
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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.AreEqual(ticks, 1);
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command.Execute(new object());
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Assert.AreEqual(ticks, 2);
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}
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}
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