jest-function generates invalid jest command line

[gaetano-guerriero]

When jest--current-defun finds a function jest is called with a command line like jest file.test.js::functionName. To my understanding the :: syntax is unknown to jest so matching tests will never be found. jest --testNamePattern=<regex> should be used instead.

[edmundmiller]

@gaetano-guerriero I think that's residual from emacs-python-pytest. I'll see about changing that or you can submit a PR for the specific change.