Weird stuff going on.

[Ozzian]

I simplified the test to inject IOptions into OptionsTestFunctionApplication and the results:

It picked the values from local.settings.json where the keys were written like the following:

• "Endpoint": "http://www.contoso.com/api",

But none of these works:

• "testSettings__endpoint": "http://www.contoso.com/another_api",
• "TestSettings__Endpoint": "http://www.contoso.com/another_api",
• "TestSettings:Endpoint": "http://www.contoso.com/another_api",

See PR for simplified scenario: #2

So, technically you could use the IOptions to inject values, but only if your fields (= keys ) doesn't conflict with each others 😬