chore: adds test for deconstructor

Signed-off-by: Vincent Biret <[email protected]>

test/Microsoft.OpenApi.Tests/Reader/ReadResultTests.cs

@@ -0,0 +1,21 @@
+using Xunit;
+using Microsoft.OpenApi.Reader;
+using Microsoft.OpenApi.Models;
+
+namespace Microsoft.OpenApi.Tests.Reader;
+
+public class ReadResultTests
+{
+    [Fact]
+    public void Deconstructs()
+    {
+        var readResult = new ReadResult()
+        {
+            Document = new OpenApiDocument(),
+            Diagnostic = new OpenApiDiagnostic()
+        };
+        var (document, diagnostic) = readResult;
+        Assert.Equal(readResult.Document, document);
+        Assert.Equal(readResult.Diagnostic, diagnostic);
+    }
+}