Will these be the tests that achieve the magical goal?

Author: darrelmiller

src/Microsoft.OpenApi.Hidi/OpenApiService.cs

@@ -103,8 +103,8 @@ private static void WriteOpenApi(FileInfo output, bool terseOutput, bool inlineL
         {
             using (logger.BeginScope("Output"))
             {
-                using var outputStream = output?.Create();
-                var textWriter = outputStream != null ? new StreamWriter(outputStream) : Console.Out;
+                using var outputStream = output.Create();
+                var textWriter = new StreamWriter(outputStream);
 
                 var settings = new OpenApiWriterSettings()
                 {

test/Microsoft.OpenApi.Hidi.Tests/Services/OpenApiServiceTests.cs

@@ -185,6 +185,26 @@ public async Task TransformCommandConvertsOpenApi()
             Assert.NotEmpty(output);
         }
 
+        [Fact]
+        public async Task TransformCommandConvertsOpenApiWithDefaultOutputname()
+        {
+            // create a dummy ILogger instance for testing
+            await OpenApiService.TransformOpenApiDocument("UtilityFiles\\SampleOpenApi.yml", null, null, null, true, null, null, false, null, false, false, null, null, null, new Logger<OpenApiService>(new LoggerFactory()), new CancellationToken());
+
+            var output = File.ReadAllText("output.yml");
+            Assert.NotEmpty(output);
+        }
+
+        [Fact]
+        public async Task TransformCommandConvertsOpenApiWithDefaultOutputnameAndSwitchFormat()
+        {
+            // create a dummy ILogger instance for testing
+            await OpenApiService.TransformOpenApiDocument("UtilityFiles\\SampleOpenApi.yml", null, null, null, true, "3.0", OpenApiFormat.Yaml, false, null, false, false, null, null, null, new Logger<OpenApiService>(new LoggerFactory()), new CancellationToken());
+
+            var output = File.ReadAllText("output.yml");
+            Assert.NotEmpty(output);
+        }
+
         [Fact]
         public async Task ThrowTransformCommandIfOpenApiAndCsdlAreEmpty()
         {