[test-runner] Allow to pass if no tests

[fgblomqvist]

If I run e.g. web-test-runner "src/**/*.test.tsx" and there are no files matching that pattern, I get this error:

Error: Could not find any test files with pattern(s): src/**/*.test.tsx

Would be nice if there was a flag that could be passed to allow it to pass if no files are found. This is useful for scaffolds and other initial stages.

[Westbrook]

Confirmation question, if you do the same with a config file pointing to the files in question, does it error the same? It's possible that you are running into the unix blob errors that can occur here before you even get into WTR.

Regardless, I'm not sure that this is something that we would likely add to the config/CLI options, though others may speak up differently on the subject. However, if you were to use the following command, you can achieve roughly the same results locally.

test -f "src/**/*.test.tsx" && wtr "src/**/*.test.tsx" ||:

[fgblomqvist]

Unfortunately I don't have this setup anymore, otherwise I would have tested it. I don't remember seeing a way to code the pattern into the config file, but I might have missed something. Either way, thanks for taking the time to respond! Feel free to close this if the decision is not to support something like it.

[peschee]

@Westbrook I'm having the same issue. I'm passing the files as a glob, not in the config file. But as soon as there are files, it works. When wtr does not find any files, I get the same error.

Your proposal works as a workaround / solution.

[LarsDenBakker]

Do we know how other test runners deal with this? I think we can follow the convention.

[fgblomqvist]

jest has a --passWithNoTests option, plain and simple.