How to mock ConfigurationManager.AppSettings with moq

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I am using AspnetMvc4. A moment ago I wrote

ConfigurationManager.AppSettings["mykey"] = "myvalue";

in my test method and it worked perfectly.

Explanation: the test method runs in a context with app settings taken from, typically a web.config or myapp.config. ConfigurationsManager can reach this application-global object and manipulate it.

Though: If you have a test runner running tests in parallel this is not a good idea.

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