Fixed failing test for authcallback returning tokenrequest or tokende…

…tails

src/IO.Ably.Tests.Shared/Rest/RestSpecs.cs

@@ -815,18 +815,18 @@ await Assert.ThrowsAsync<AblyException>(() =>
             }
 
             [Fact]
-            public async Task WhenCallbackReturnsAnObjectThatIsNotTokenRequestOrTokenDetails_ThrowsAblyException()
+            public async Task WhenAuthCallbackReturnsAnObjectThatIsNotTokenRequestOrTokenDetails_ThrowsAblyException()
             {
-                var signedTokenRequest = await new AblyRest("fake.key:fakeid").Auth.CreateTokenRequestAsync();
-                // do not throw exceptions
-                var objects = new object[] { new TokenDetails(), new TokenRequest() };
+                string serializedTokenRequest = await new AblyRest("fake.key:fakeid").Auth.CreateTokenRequestAsync();
+                // do not throw exceptions for valid values in authCallback
+                var objects = new object[] { new TokenDetails(), new TokenRequest(), serializedTokenRequest };
                 foreach (var obj in objects)
                 {
-                    var exception = await Record.ExceptionAsync(async () => await GetClient(_ => Task.FromResult<object>(obj)).StatsAsync());
+                    var exception = await Record.ExceptionAsync(async () => await GetClient(_ => Task.FromResult(obj)).StatsAsync());
                     Assert.Null(exception);
                 }
 
-                // throw exceptions
+                // throw exceptions for invalid values in authCallback
                 objects = new[] { new object(), string.Empty, new Uri("http://test"), "jwtToken" };
                 foreach (var obj in objects)
                 {
@@ -846,7 +846,10 @@ private static AblyRest GetClient(Func<TokenParams, Task<object>> authCallback)
                 };
 
                 var rest = new AblyRest(options);
-                rest.ExecuteHttpRequest = delegate { return "[{}]".ToAblyResponse(); };
+                rest.ExecuteHttpRequest = arg => arg.Url.Contains("requestToken") ?
+                    JsonHelper.Serialize(new TokenDetails()).ToAblyResponse() :
+                    "[{}]".ToAblyResponse();
+
                 return rest;
             }
         }