Merge branch 'fd/check-ref-format-onelevel-tests' into jch

Tests for the option precedence of '--allow-onelevel' and its
negated form have been added to 'git check-ref-format',
establishing the current behavior before a planned migration to the
'parse_options()' API.

* fd/check-ref-format-onelevel-tests:
  t1402: test --no-allow-onelevel option precedence

t/t1402-check-ref-format.sh

@@ -74,6 +74,8 @@ invalid_ref 'heads/foo*/bar*' --refspec-pattern
 ref='foo'
 invalid_ref "$ref"
 valid_ref "$ref" --allow-onelevel
+invalid_ref "$ref" '--allow-onelevel --no-allow-onelevel'
+valid_ref "$ref" '--no-allow-onelevel --allow-onelevel'
 invalid_ref "$ref" --refspec-pattern
 valid_ref "$ref" '--refspec-pattern --allow-onelevel'
 invalid_ref "$ref" --normalize