Issues with Jest and .env.test

[cal-overflow]

I have read both the docs and existing posts several times now. I currently have an issue when running my jest tests.
Here's a minimal recreation of my setup:

.env

MY_VAR=real_value

babel.config.js

module.exports = {
  presets: ['module:metro-react-native-babel-preset'],
  sourceMaps: true,
  plugins: ['module:react-native-dotenv'],
};

When I run my application, everything works as expected. The values from .env are loaded in correctly. Here's an example of how I use these variables in my project.
src/WelcomeScreen.js

import { MY_VAR } from '@env';

console.log(`variable value: ${MY_VAR}`);
// ...

Like I mentioned above, this works when I build the app using metro. I would see variable value: real_value as the log output.

The issue

The problem comes when I run jest. Following the docs, I have created a special .env.test file with a different set of values.
.env.test

MY_VAR=test_value

When I run my test files, I see that these .env.test variable values are used. For example:
src/WelcomeScreen.test.js

import { MY_VAR } from '@env';

console.log(`variable value: ${MY_VAR}`);

Shows variable value: test_value.
However, the reference to MY_VAR in src/WelcomeScreen.js will throw the following error.

ReferenceError: MY_VAR is not defined.

At this point I'm unsure if there is a configuration setting I'm missing or there is something going on with Jest that is interfering with how the module is being loaded into the non-test files.
Any suggestions are welcome!

Related:

• How to use with jest? ReferenceError: ENV_VARIABLE is not defined.  #59
• How to mock react-native-dotenv in jest #204

[cal-overflow]

@goatandsheep do you have any idea on how to resolve this?

[cal-overflow]

Still haven't found a solution for this. I just created a wrapper module that I can easily mock. It would be nice if there was clarity around this, though.

[goatandsheep]

I'm looking into it 👍🏽 I'd love to see what you did for the wrapper!

[goatandsheep]

@cal-overflow have you tried doing jest --no-cache?