Added unit tests for controller source generator

Author: Bart Koelman

JsonApiDotNetCore.sln

@@ -46,7 +46,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TestBuildingBlocks", "test\
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "JsonApiDotNetCore.SourceGenerators", "src\JsonApiDotNetCore.SourceGenerators\JsonApiDotNetCore.SourceGenerators.csproj", "{952C0FDE-AFC8-455C-986F-6CC882ED8953}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SourceGeneratorDebugger", "test\SourceGeneratorDebugger\SourceGeneratorDebugger.csproj", "{87D066F9-3540-4AC7-A748-134900969EE5}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SourceGeneratorDebugger", "test\SourceGeneratorDebugger\SourceGeneratorDebugger.csproj", "{87D066F9-3540-4AC7-A748-134900969EE5}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SourceGeneratorTests", "test\SourceGeneratorTests\SourceGeneratorTests.csproj", "{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -238,6 +240,18 @@ Global
 		{87D066F9-3540-4AC7-A748-134900969EE5}.Release|x64.Build.0 = Release|Any CPU
 		{87D066F9-3540-4AC7-A748-134900969EE5}.Release|x86.ActiveCfg = Release|Any CPU
 		{87D066F9-3540-4AC7-A748-134900969EE5}.Release|x86.Build.0 = Release|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Debug|x64.Build.0 = Debug|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Debug|x86.Build.0 = Debug|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Release|x64.ActiveCfg = Release|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Release|x64.Build.0 = Release|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Release|x86.ActiveCfg = Release|Any CPU
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -258,6 +272,7 @@ Global
 		{210FD61E-FF5D-4CEE-8E0D-C739ECCCBA21} = {24B15015-62E5-42E1-9BA0-ECE6BE7AA15F}
 		{952C0FDE-AFC8-455C-986F-6CC882ED8953} = {7A2B7ADD-ECB5-4D00-AA6A-D45BD11C97CF}
 		{87D066F9-3540-4AC7-A748-134900969EE5} = {24B15015-62E5-42E1-9BA0-ECE6BE7AA15F}
+		{0E0B5C51-F7E2-4F40-A4E4-DED0E9731DC9} = {24B15015-62E5-42E1-9BA0-ECE6BE7AA15F}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {A2421882-8F0A-4905-928F-B550B192F9A4}

test/SourceGeneratorTests/CompilationBuilder.cs

@@ -0,0 +1,79 @@
+using System.Collections.Generic;
+using System.IO;
+using JsonApiDotNetCore.Resources.Annotations;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using Microsoft.Extensions.Logging;
+
+namespace SourceGeneratorTests
+{
+    internal sealed class CompilationBuilder
+    {
+        private static readonly CSharpCompilationOptions DefaultOptions = new(OutputKind.DynamicallyLinkedLibrary);
+
+        private readonly HashSet<SyntaxTree> _syntaxTrees = new();
+        private readonly HashSet<MetadataReference> _references = new();
+
+        public Compilation Build()
+        {
+            return CSharpCompilation.Create("compilation", _syntaxTrees, _references, DefaultOptions);
+        }
+
+        public CompilationBuilder WithDefaultReferences()
+        {
+            WithSystemReferences();
+            WithLoggerFactoryReference();
+            WithJsonApiDotNetCoreReferences();
+            return this;
+        }
+
+        public CompilationBuilder WithSystemReferences()
+        {
+            string objectLocation = typeof(object).Assembly.Location;
+
+            PortableExecutableReference systemRuntimeReference =
+                MetadataReference.CreateFromFile(Path.Combine(Path.GetDirectoryName(objectLocation)!, "System.Runtime.dll"));
+
+            foreach (var reference in new[]
+            {
+                MetadataReference.CreateFromFile(objectLocation),
+                systemRuntimeReference
+            })
+            {
+                _references.Add(reference);
+            }
+
+            return this;
+        }
+
+        public CompilationBuilder WithLoggerFactoryReference()
+        {
+            PortableExecutableReference loggerFactoryReference = MetadataReference.CreateFromFile(typeof(ILoggerFactory).Assembly.Location);
+            _references.Add(loggerFactoryReference);
+
+            return this;
+        }
+
+        public CompilationBuilder WithJsonApiDotNetCoreReferences()
+        {
+            foreach (var reference in new[]
+            {
+                MetadataReference.CreateFromFile(typeof(ControllerBase).Assembly.Location),
+                MetadataReference.CreateFromFile(typeof(AttrAttribute).Assembly.Location)
+            })
+            {
+                _references.Add(reference);
+            }
+
+            return this;
+        }
+
+        public CompilationBuilder WithSourceCode(string source)
+        {
+            SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(source);
+            _syntaxTrees.Add(syntaxTree);
+            return this;
+        }
+    }
+}