Add DoubleWritesAnalyzer_Tests

src/BuildCheck.UnitTests/DoubleWritesAnalyzer_Tests.cs

@@ -0,0 +1,109 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using Microsoft.Build.BackEnd.Logging;
+using Microsoft.Build.Experimental.BuildCheck;
+using Microsoft.Build.Experimental.BuildCheck.Analyzers;
+using Microsoft.Build.Experimental.BuildCheck.Infrastructure;
+using Shouldly;
+using Xunit;
+
+namespace Microsoft.Build.BuildCheck.UnitTests
+{
+    public sealed class DoubleWritesAnalyzer_Tests
+    {
+        private sealed class MockBuildCheckRegistrationContext : IBuildCheckRegistrationContext
+        {
+            private event Action<BuildCheckDataContext<TaskInvocationAnalysisData>>? _taskInvocationAction;
+
+            public List<BuildCheckResult> Results { get; } = new();
+
+            public void RegisterEvaluatedPropertiesAction(Action<BuildCheckDataContext<EvaluatedPropertiesAnalysisData>> evaluatedPropertiesAction) => throw new NotImplementedException();
+            public void RegisterParsedItemsAction(Action<BuildCheckDataContext<ParsedItemsAnalysisData>> parsedItemsAction) => throw new NotImplementedException();
+
+            public void RegisterTaskInvocationAction(Action<BuildCheckDataContext<TaskInvocationAnalysisData>> taskInvocationAction)
+                => _taskInvocationAction += taskInvocationAction;
+
+            public void TriggerTaskInvocationAction(TaskInvocationAnalysisData data)
+            {
+                if (_taskInvocationAction is not null)
+                {
+                    BuildCheckDataContext<TaskInvocationAnalysisData> context = new BuildCheckDataContext<TaskInvocationAnalysisData>(
+                        null!,
+                        null!,
+                        null!,
+                        ResultHandler,
+                        data);
+                    _taskInvocationAction(context);
+                }
+            }
+
+            private void ResultHandler(BuildAnalyzerWrapper wrapper, LoggingContext context, BuildAnalyzerConfigurationInternal[] configs, BuildCheckResult result)
+                => Results.Add(result);
+        }
+
+        private readonly DoubleWritesAnalyzer _analyzer;
+
+        private readonly MockBuildCheckRegistrationContext _registrationContext;
+
+        public DoubleWritesAnalyzer_Tests()
+        {
+            _analyzer = new DoubleWritesAnalyzer();
+            _registrationContext = new MockBuildCheckRegistrationContext();
+            _analyzer.RegisterActions(_registrationContext);
+        }
+
+        private TaskInvocationAnalysisData MakeTaskInvocationData(string taskName, Dictionary<string, TaskInvocationAnalysisData.TaskParameter> parameters)
+        {
+            string projectFile = NativeMethodsShared.IsWindows ? @"C:\fake\project.proj" : "/fake/project.proj";
+            return new TaskInvocationAnalysisData(
+                projectFile,
+                Construction.ElementLocation.EmptyLocation,
+                taskName,
+                projectFile,
+                parameters);
+        }
+
+        [Fact]
+        public void TestCopyTask()
+        {
+            _registrationContext.TriggerTaskInvocationAction(MakeTaskInvocationData("Copy", new Dictionary<string, TaskInvocationAnalysisData.TaskParameter>
+                {
+                    { "SourceFiles", new TaskInvocationAnalysisData.TaskParameter("source1", IsOutput: false) },
+                    { "DestinationFolder", new TaskInvocationAnalysisData.TaskParameter("outdir", IsOutput: false) },
+                }));
+            _registrationContext.TriggerTaskInvocationAction(MakeTaskInvocationData("Copy", new Dictionary<string, TaskInvocationAnalysisData.TaskParameter>
+                {
+                    { "SourceFiles", new TaskInvocationAnalysisData.TaskParameter("source1", IsOutput: false) },
+                    { "DestinationFiles", new TaskInvocationAnalysisData.TaskParameter(Path.Combine("outdir", "source1"), IsOutput: false) },
+                }));
+
+            _registrationContext.Results.Count.ShouldBe(1);
+            _registrationContext.Results[0].BuildAnalyzerRule.Id.ShouldBe("BC0102");
+        }
+
+        [Theory]
+        [InlineData("Csc")]
+        [InlineData("Vbc")]
+        [InlineData("Fsc")]
+        public void TestCompilerTask(string taskName)
+        {
+            for (int i = 0; i < 2; i++)
+            {
+                _registrationContext.TriggerTaskInvocationAction(MakeTaskInvocationData(taskName, new Dictionary<string, TaskInvocationAnalysisData.TaskParameter>
+                    {
+                        { "OutputAssembly", new TaskInvocationAnalysisData.TaskParameter("out.dll", IsOutput: false) },
+                        { "OutputRefAssembly", new TaskInvocationAnalysisData.TaskParameter("out_ref.dll", IsOutput: false) },
+                        { "DocumentationFile", new TaskInvocationAnalysisData.TaskParameter("out.xml", IsOutput: false) },
+                        { "PdbFile", new TaskInvocationAnalysisData.TaskParameter("out.pdb", IsOutput: false) },
+                    }));
+            }
+
+            _registrationContext.Results.Count.ShouldBe(4);
+            _registrationContext.Results.ForEach(result => result.BuildAnalyzerRule.Id.ShouldBe("BC0102"));
+        }
+    }
+}