1 files changed, 88 insertions, 0 deletions
diff --git a/src/SMAPI.ModBuildConfig.Analyzer.Tests/ObsoleteFieldAnalyzerTests.cs b/src/SMAPI.ModBuildConfig.Analyzer.Tests/ObsoleteFieldAnalyzerTests.cs
new file mode 100644
index 00000000..dc7476ef
--- /dev/null
+++ b/src/SMAPI.ModBuildConfig.Analyzer.Tests/ObsoleteFieldAnalyzerTests.cs
@@ -0,0 +1,88 @@
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Diagnostics;
+using NUnit.Framework;
+using SMAPI.ModBuildConfig.Analyzer.Tests.Framework;
+using StardewModdingAPI.ModBuildConfig.Analyzer;
+
+namespace SMAPI.ModBuildConfig.Analyzer.Tests
+{
+    /// <summary>Unit tests for <see cref="ObsoleteFieldAnalyzer"/>.</summary>
+    [TestFixture]
+    public class ObsoleteFieldAnalyzerTests : DiagnosticVerifier
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>Sample C# mod code, with a {{test-code}} placeholder for the code in the Entry method to test.</summary>
+        const string SampleProgram = @"
+            using System;
+            using StardewValley;
+            using Netcode;
+            using SObject = StardewValley.Object;
+
+            namespace SampleMod
+            {
+                class ModEntry
+                {
+                    public void Entry()
+                    {
+                        {{test-code}}
+                    }
+                }
+            }
+        ";
+
+        /// <summary>The line number where the unit tested code is injected into <see cref="SampleProgram"/>.</summary>
+        private const int SampleCodeLine = 13;
+
+        /// <summary>The column number where the unit tested code is injected into <see cref="SampleProgram"/>.</summary>
+        private const int SampleCodeColumn = 25;
+
+
+        /*********
+        ** Unit tests
+        *********/
+        /// <summary>Test that no diagnostics are raised for an empty code block.</summary>
+        [TestCase]
+        public void EmptyCode_HasNoDiagnostics()
+        {
+            // arrange
+            string test = @"";
+
+            // assert
+            this.VerifyCSharpDiagnostic(test);
+        }
+
+        /// <summary>Test that the expected diagnostic message is raised for an obsolete field reference.</summary>
+        /// <param name="codeText">The code line to test.</param>
+        /// <param name="column">The column within the code line where the diagnostic message should be reported.</param>
+        /// <param name="oldName">The old field name which should be reported.</param>
+        /// <param name="newName">The new field name which should be reported.</param>
+        [TestCase("var x = new Farmer().friendships;", 8, "StardewValley.Farmer.friendships", "friendshipData")]
+        public void AvoidObsoleteField_RaisesDiagnostic(string codeText, int column, string oldName, string newName)
+        {
+            // arrange
+            string code = ObsoleteFieldAnalyzerTests.SampleProgram.Replace("{{test-code}}", codeText);
+            DiagnosticResult expected = new DiagnosticResult
+            {
+                Id = "SMAPI003",
+                Message = $"The '{oldName}' field is obsolete and should be replaced with '{newName}'. See https://smapi.io/buildmsg/smapi003 for details.",
+                Severity = DiagnosticSeverity.Warning,
+                Locations = new[] { new DiagnosticResultLocation("Test0.cs", ObsoleteFieldAnalyzerTests.SampleCodeLine, ObsoleteFieldAnalyzerTests.SampleCodeColumn + column) }
+            };
+
+            // assert
+            this.VerifyCSharpDiagnostic(code, expected);
+        }
+
+
+        /*********
+        ** Helpers
+        *********/
+        /// <summary>Get the analyzer being tested.</summary>
+        protected override DiagnosticAnalyzer GetCSharpDiagnosticAnalyzer()
+        {
+            return new ObsoleteFieldAnalyzer();
+        }
+    }
+}