[PATCH 09/10] t: make sure that 'test_i18ngrep' got enough parameters

Two of the previous patches in this series fixed two bogus 'test_i18ngrep' invocations that had neither a filename parameter not anything piped into their standard input, yet both managed to remain unnoticed for years. A third similarly bogus invocation is currently lurking in 'pu' for a couple of weeks now.

Try to catch similar mistakes in the future by ensuring that 'test_i18ngrep' has at least two parameters, not including an optional '!' to negate the pattern. Perform these checks after we made sure that there is no data on the 'test_i18ngrep's standard input, so if the filename parameter is missing because someone is piping a git command's output into this function, then they would get the more relevant error message.

Note that this is not quite perfect, as it doesn't account for any 'grep --options' given as parameters. However, doing so would be far too complicated, considering that patters can start with dashes as well, and in the majority of the cases we don't use any such options anyway.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
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About that third one in 'pu': it's test '3b-check: Avoid implicit rename if involved as source on current side' introduced in commit fcd649216 (directory rename detection: testcases to avoid taking detection too far, 2018-01-05) in branch 'en/rename-directory-detection'.

  https://public-inbox.org/git/CAM0VKj=qhJQJ7uJWbBouSTYD0frA1zp1gwXzMVXuTiF+C6GH+g@mail.gmail.com/T/#u

 t/test-lib-functions.sh | 6 ++++++
 1 file changed, 6 insertions(+)