More tests.

Author: JohanLarsson

IDisposableAnalyzers.Test/Helpers/DisposableMemberTests.cs

@@ -0,0 +1,38 @@
+namespace IDisposableAnalyzers.Test.Helpers
+{
+    using System.Threading;
+    using Gu.Roslyn.AnalyzerExtensions;
+    using Gu.Roslyn.Asserts;
+    using Microsoft.CodeAnalysis.CSharp;
+    using Microsoft.CodeAnalysis.CSharp.Syntax;
+    using NUnit.Framework;
+
+    public static class DisposableMemberTests
+    {
+        [Test]
+        public static void SimpleField()
+        {
+            var syntaxTree = CSharpSyntaxTree.ParseText(@"
+namespace N
+{
+    using System;
+    using System.IO;
+
+    class C : IDisposable
+    {
+        private readonly IDisposable stream = File.OpenRead(string.Empty);
+
+        public void Dispose()
+        {
+            this.stream.Dispose();
+        }
+    }
+}");
+            var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes());
+            var semanticModel = compilation.GetSemanticModel(syntaxTree);
+            var field = syntaxTree.FindFieldDeclaration("stream");
+            var fieldSymbol = semanticModel.GetDeclaredSymbolSafe(field, CancellationToken.None);
+            Assert.AreEqual(Result.Yes, DisposableMember.IsDisposed(new FieldOrProperty(fieldSymbol), (TypeDeclarationSyntax)field.Parent, semanticModel, CancellationToken.None));
+        }
+    }
+}