move mock classes out of sample code (#471)

src/SMAPI.ModBuildConfig.Analyzer.Tests/Framework/DiagnosticVerifier.Helper.cs

@@ -20,6 +20,7 @@ namespace SMAPI.ModBuildConfig.Analyzer.Tests.Framework
         private static readonly MetadataReference SystemCoreReference = MetadataReference.CreateFromFile(typeof(Enumerable).Assembly.Location);
         private static readonly MetadataReference CSharpSymbolsReference = MetadataReference.CreateFromFile(typeof(CSharpCompilation).Assembly.Location);
         private static readonly MetadataReference CodeAnalysisReference = MetadataReference.CreateFromFile(typeof(Compilation).Assembly.Location);
+        private static readonly MetadataReference SelfReference = MetadataReference.CreateFromFile(typeof(DiagnosticVerifier).Assembly.Location);
 
         internal static string DefaultFilePathPrefix = "Test";
         internal static string CSharpDefaultFileExt = "cs";
@@ -150,6 +151,7 @@ namespace SMAPI.ModBuildConfig.Analyzer.Tests.Framework
             var solution = new AdhocWorkspace()
                 .CurrentSolution
                 .AddProject(projectId, TestProjectName, TestProjectName, language)
+                .AddMetadataReference(projectId, DiagnosticVerifier.SelfReference)
                 .AddMetadataReference(projectId, CorlibReference)
                 .AddMetadataReference(projectId, SystemCoreReference)
                 .AddMetadataReference(projectId, CSharpSymbolsReference)

src/SMAPI.ModBuildConfig.Analyzer.Tests/Mock/Netcode/NetFieldBase.cs

@@ -0,0 +1,16 @@
+// ReSharper disable CheckNamespace -- matches Stardew Valley's code
+namespace Netcode
+{
+    /// <summary>A simplified version of Stardew Valley's <c>Netcode.NetFieldBase</c> for unit testing.</summary>
+    /// <typeparam name="T">The type of the synchronised value.</typeparam>
+    /// <typeparam name="TSelf">The type of the current instance.</typeparam>
+    public class NetFieldBase<T, TSelf> where TSelf : NetFieldBase<T, TSelf>
+    {
+        /// <summary>The synchronised value.</summary>
+        public T Value { get; set; }
+
+        /// <summary>Implicitly convert a net field to the its type.</summary>
+        /// <param name="field">The field to convert.</param>
+        public static implicit operator T(NetFieldBase<T, TSelf> field) => field.Value;
+    }
+}

src/SMAPI.ModBuildConfig.Analyzer.Tests/Mock/Netcode/NetInt.cs

@@ -0,0 +1,6 @@
+// ReSharper disable CheckNamespace -- matches Stardew Valley's code
+namespace Netcode
+{
+    /// <summary>A simplified version of Stardew Valley's <c>Netcode.NetInt</c> for unit testing.</summary>
+    public class NetInt : NetFieldBase<int, NetInt> { }
+}

src/SMAPI.ModBuildConfig.Analyzer.Tests/Mock/Netcode/NetRef.cs

@@ -0,0 +1,6 @@
+// ReSharper disable CheckNamespace -- matches Stardew Valley's code
+namespace Netcode
+{
+    /// <summary>A simplified version of Stardew Valley's <c>Netcode.NetRef</c> for unit testing.</summary>
+    public class NetRef : NetFieldBase<object, NetRef> { }
+}

src/SMAPI.ModBuildConfig.Analyzer.Tests/Mock/StardewValley/Item.cs

@@ -0,0 +1,18 @@
+// ReSharper disable CheckNamespace, InconsistentNaming -- matches Stardew Valley's code
+using Netcode;
+
+namespace StardewValley
+{
+    /// <summary>A simplified version of Stardew Valley's <c>StardewValley.Item</c> class for unit testing.</summary>
+    public class Item
+    {
+        /// <summary>A net int field with an equivalent non-net <c>Category</c> property.</summary>
+        public NetInt category { get; } = new NetInt { Value = 42 };
+
+        /// <summary>A net int field with no equivalent non-net property.</summary>
+        public NetInt type { get; } = new NetInt { Value = 42 };
+
+        /// <summary>A net reference field.</summary>
+        public NetRef refField { get; } = null;
+    }
+}

src/SMAPI.ModBuildConfig.Analyzer.Tests/Mock/StardewValley/Object.cs

@@ -0,0 +1,6 @@
+// ReSharper disable CheckNamespace -- matches Stardew Valley's code
+namespace StardewValley
+{
+    /// <summary>A simplified version of Stardew Valley's <c>StardewValley.Object</c> class for unit testing.</summary>
+    public class Object : Item { }
+}

src/SMAPI.ModBuildConfig.Analyzer.Tests/UnitTests.cs

@@ -18,28 +18,7 @@ namespace SMAPI.ModBuildConfig.Analyzer.Tests
             using System;
             using StardewValley;
             using Netcode;
-
-            namespace Netcode
-            {
-                public class NetInt : NetFieldBase<int, NetInt> { }
-                public class NetRef : NetFieldBase<object, NetRef> { }
-                public class NetFieldBase<T, TSelf> where TSelf : NetFieldBase<T, TSelf>
-                {
-                    public T Value { get; set; }
-                    public static implicit operator T(NetFieldBase<T, TSelf> field) => field.Value;
-                }
-            }
-
-            namespace StardewValley
-            {
-                class Item
-                {
-                    public NetInt category { get; } = new NetInt { Value = 42 }; // SMAPI002: use Category instead
-                    public NetInt type { get; } = new NetInt { Value = 42 };
-                    public NetRef refField { get; } = null;
-                }
-                class SObject : Item { }
-            }
+            using SObject = StardewValley.Object;
 
             namespace SampleMod
             {
@@ -51,7 +30,7 @@ namespace SMAPI.ModBuildConfig.Analyzer.Tests
                         SObject obj = null;
 
                         // this line should raise diagnostics
-                        {{test-code}} // line 38
+                        {{test-code}}
 
                         // these lines should not
                         if (item.type.Value != 42);
@@ -61,7 +40,7 @@ namespace SMAPI.ModBuildConfig.Analyzer.Tests
         ";
 
         /// <summary>The line number where the unit tested code is injected into <see cref="SampleProgram"/>.</summary>
-        private const int SampleCodeLine = 38;
+        private const int SampleCodeLine = 17;
 
         /// <summary>The column number where the unit tested code is injected into <see cref="SampleProgram"/>.</summary>
         private const int SampleCodeColumn = 25;