[WTF-2710]: Fix unit tests failing on ValueStatus import

[alihcsumer]

Checklist

• Contains unit tests ❌
• Contains breaking changes ❌
• Did you update version and changelog? ❌

This PR contains

• Bug fix

What is the purpose of this PR?

...

Relevant changes

Unit tests run via pluggable-widgets-tools test:unit:web fail to load any test suite whose module graph imports a runtime value from the mendix package.
The suite errors out before any test runs with "This package should not be used in the runtime."

[weirdwater]

I like the approach proposed in !192 better, since it follows a pattern we already use for mocking other parts of the mendix package.

Additionally I would ask to add some form of type checking. In this example the mocked enum is checked for completeness. This will throw an error when the mock misses a member.

export const FormatterType: { [t in keyof typeof mendix.FormatterType]: string } = {
    Number: "number",
    DateTime: "datetime",
}

I tried to check for both completeness and consistency, but I was not able to index over the enum without importing the value.

[weirdwater]

Blame @stdagkalakis for triggering me on the RN. I would propose to frame the change as a fix, considering it is not really a new feature.

We fixed an issue with the Jest configuration affecting unit tests for widgets importing enums from the mendix package (e.g. ValueStatus, FormatterType). It would cause tests to fail with the error "This package should not be used in the runtime".

[stdagkalakis]

I agree with the Fix instead of Feature, and feel blamed