What is the best location for storing test utilities in Next.js applications?

Question

What is the best location for storing test utilities in Next.js applications?

My Next.js (12.x) React (18.x) project includes Jest (28.x) for testing. While my tests in files like __tests__/Product.test.tsx work smoothly, I encountered an issue when trying to reuse some utils across tests:

__tests__/util/my-test-helper.ts

export function setupSomeThing() {
  return { foo: jest.fn() };
}

I imported this function into my tests, but the test runner displayed the following error message:

FAIL  __tests__/util/my-test-helper.ts

* Test suite failed to run
  Your test suite must contain at least one test.

How can I address this problem? The documentation on testing in Next.js doesn't provide guidance on this specific scenario.

What is the recommended approach or workaround for handling Jest tests in a Next.js environment?

typescript next.js jestjs

Answer 1

Answer №1

Here is how I have been handling this issue: I keep my utility functions in a folder called:

__tests-utils__/my-test-helper.ts

Some suggestions mentioned in the comments include modifying the Jest test match pattern or utilizing an existing default exception for conventions. However, for now, the approach mentioned above works well for me.

Answer 2

Here is how I have been handling this issue: I keep my utility functions in a folder called:

__tests-utils__/my-test-helper.ts

Some suggestions mentioned in the comments include modifying the Jest test match pattern or utilizing an existing default exception for conventions. However, for now, the approach mentioned above works well for me.

Answer 3

Answer №2

To ensure only files ending with test.ts(x) or test.js(x) are included in the Jest runner configuration, exclude all other files.

// Update your jest.config file
testRegex: '.*\\.test\\.tsx?$'

Answer 4

To ensure only files ending with test.ts(x) or test.js(x) are included in the Jest runner configuration, exclude all other files.

// Update your jest.config file
testRegex: '.*\\.test\\.tsx?$'

What is the best location for storing test utilities in Next.js applications?

Answer №1

Answer №2

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