[PATCH v2] t1401: check symbolic-ref exit codes and --quiet silence

From: Nikolaus Schuetz <nikolauspschuetz@gmail.com>

git-symbolic-ref(1) documents that reading a name that is not a symbolic ref exits non-zero, and that --quiet does so silently. Tests such as t2020 and t5621 already rely on "symbolic-ref -q HEAD" failing on a detached HEAD, but none pins the exact exit codes or checks that --quiet actually suppresses the diagnostic.

Assert that a non-symbolic ref exits 128 with the "is not a symbolic ref" message, and that --quiet instead exits 1 with no output.

Signed-off-by: Nikolaus Schuetz <nikolauspschuetz@gmail.com>
---
    t1401: test symbolic-ref exit codes on a non-symbolic ref
    
    git-symbolic-ref(1) documents that reading a name that is not a symbolic
    ref exits with a non-zero status, and that --quiet does so silently
    rather than printing a diagnostic. This exit-code contract was untested.
    
    This adds two tests: querying a non-symbolic ref exits 128 with the
    usual "is not a symbolic ref" message, and --quiet instead exits 1 with
    no output.
    
    Test-only; documents existing behaviour, in the spirit of 919eb8ace
    (t1402: check for refs ending with a dot).

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-2204%2Fnikolauspschuetz%2Fns%2Ft1401-symbolic-ref-quiet-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-2204/nikolauspschuetz/ns/t1401-symbolic-ref-quiet-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/2204

Range-diff vs v1:

 1:  345e664a52 ! 1:  22694da869 t1401: test symbolic-ref exit codes on a non-symbolic ref
     @@ Metadata
      Author: Nikolaus Schuetz <nikolauspschuetz@gmail.com>
      
       ## Commit message ##
     -    t1401: test symbolic-ref exit codes on a non-symbolic ref
     +    t1401: check symbolic-ref exit codes and --quiet silence
      
          git-symbolic-ref(1) documents that reading a name that is not a
     -    symbolic ref exits with a non-zero status, and that --quiet does so
     -    silently rather than printing a diagnostic.  This was not tested.
     +    symbolic ref exits non-zero, and that --quiet does so silently.
     +    Tests such as t2020 and t5621 already rely on "symbolic-ref -q HEAD"
     +    failing on a detached HEAD, but none pins the exact exit codes or
     +    checks that --quiet actually suppresses the diagnostic.
      
     -    Check that querying a non-symbolic ref exits 128 with the usual
     -    "is not a symbolic ref" message, and that --quiet instead exits 1
     -    with no output.
     +    Assert that a non-symbolic ref exits 128 with the "is not a symbolic
     +    ref" message, and that --quiet instead exits 1 with no output.
      
          Signed-off-by: Nikolaus Schuetz <nikolauspschuetz@gmail.com>
      
     @@ t/t1401-symbolic-ref.sh: test_expect_success 'symbolic-ref refuses bare sha1' '
       reset_to_sane
       
      +test_expect_success 'symbolic-ref reports a non-symbolic ref with exit code 128' '
     -+	test_expect_code 128 git symbolic-ref refs/heads/foo 2>err &&
     ++	test_expect_code 128 git symbolic-ref refs/heads/foo >out 2>err &&
     ++	test_must_be_empty out &&
      +	test_grep "is not a symbolic ref" err
      +'
      +
      +test_expect_success 'symbolic-ref -q is silent and exits 1 on a non-symbolic ref' '
     -+	test_expect_code 1 git symbolic-ref -q refs/heads/foo 2>err &&
     ++	test_expect_code 1 git symbolic-ref -q refs/heads/foo >out 2>err &&
     ++	test_must_be_empty out &&
      +	test_must_be_empty err
      +'
      +

 t/t1401-symbolic-ref.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)