Merges all tests in NX projects into a single file that can be executed faster.
It is important that barrel file imports and exports in your code are maintained. Otherwise, invalid code may be generated.
nxjestmerge merge <workspace folder>
This will create a test-files-bundle.spec.ts file in the sourceRoot path of every nx project
that is found in the workspace.
This file will contain all the tests from the project.
nx run-many --target=test --all --testFile=test-files-bundle.spec.ts
(--testFile=test-files-bundle.spec.ts is the important part)
This will use your existing jest configuration but only run the merged tests.
nxjestmerge clean <workspace folder>
This will remove all test-files-bundle.spec.ts files from the workspace.
In a project with approximately 1000 tests, the time to run the tests went from 2m to 28s.
