Nestjs testing module not found

If you're coming from google then this can also happen if VSCode autocompletes your imports as src/xyz/abc/service.ts instead of ../xyz/abc/service.ts.

When running tests the test code won't be able to locate the correct service(s) at run-time. It needs fully relative paths without an absolute 'src/' at the beginning.

As you are using typescript's path mapping, you need to also update your jest config with the mapped paths as well. Your jest config needs to have the following added:Assuming that your is set to be . and not ./src. You can find more info on it here. https://kulshekhar.github.io/ts-jest/user/config/#paths-mapping