Description

Configuring a not supported test framework in app config (eg "mstest" instead of "mstestv2") through FluentAssertions.TestFramework key throws a misleading exception message, which says:

"FluentAssertions was configured to use mstest but the required test framework assembly could not be found"

When it should say something like

string.Format("FluentAssertions was configured to use {0} but this test framework is not supported. Use one of the supported frameworks:  {1}",  frameworkName, string.Join(", ", Frameworks.Keys));

Complete minimal example reproducing the issue

Add the following to app.config:

 <add key="FluentAssertions.TestFramework" value="mstest" />

Add a failing test:

true.Should().BeFalse();

Expected behavior:

Message saying that the configured test framework is not supported and list the supported ones

Actual behavior:

Message saying that the test framework assembly could not be found (which leads to reviwing if the assembly is there, etc).

Versions

.net 462
FluentAssertions version 5.10.3