System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize

[carldebilly]

Problem

Try to use FluentAssertions on a Xamarin project (Android), running in a custom-made test engine. While trying to assert something, I'm getting this error:

`System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize`

02-25 02:42:35.008 D/Mono    (18235): Assembly Ref addref FluentAssertions[0xdff7e940] -> System.Configuration.ConfigurationManager[0xdff7eee0]: 2
�[41m�[30mfail�[39m�[22m�[49m: Windows.UI.Core.CoreDispatcher[0]
      Dispatcher unhandled exception
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize ---> System.PlatformNotSupportedException: Operation is not supported on this platform.
  at System.Configuration.ClientConfigPaths..ctor (System.String exePath, System.Boolean includeUserConfig) [0x00050] in <4cd8a957e7664f4a9e27ce43dd1afeb7>:0 
  at System.Configuration.ClientConfigPaths.GetPaths (System.String exePath, System.Boolean includeUserConfig) [0x00018] in <4cd8a957e7664f4a9e27ce43dd1afeb7>:0 
  at System.Configuration.ClientConfigurationHost.get_ConfigPaths () [0x0000a] in <4cd8a957e7664f4a9e27ce43dd1afeb7>:0 
  at System.Configuration.ClientConfigurationHost.GetStreamName (System.String configPath) [0x0006d] in <4cd8a957e7664f4a9e27ce43dd1afeb7>:0 
  at System.Configuration.ClientConfigurationHost.02-25 02:42:41.664 I/mono-stdout(18235): �[41m�[30mfail�[39m�[22m�[49m: Windows.UI.Core.CoreDispatcher[0]

Complete minimal example reproducing the issue

Add FluentAssertions to any Xamarin project and try to assert something.

Expected behavior:

It should work on any netstandard platform. In this case it seems to be netstandard2.1.

Actual behavior:

The configuration doesn't seem to work. On platform without configuration it should fallback to default values.

Versions

• Which version of Fluent Assertions are you using?
  5.6.0
• Which .NET runtime and version are you targeting? E.g. .NET framework 4.6.1 or .NET Core 2.1.
  MonoAndroid 9.0

Additional Information

It's used in THIS PROJECT to run unit tests on all supported platforms (iOS, Android and Mono-Wasm).

[dennisdoomen]

This was already fixed in 5.10. See #1210

[carldebilly]

It works. Thanks!