[PATCH] test: completion: tests for __gitcomp regression

[Felipe Contreras <felipe.contreras@gmail.com>]

There's a regression in the completion since the introduction of
__gitcomp.

Go to any directory that doesn't contain a git repository, like /tmp.
Then type the following:

  git checkout --<tab>

You will see nothing. That's because
`git checkout --git-completion-helper` fails when you run it outside a
git repository.

You might change to a directory that has a git repository, but it's too
late, because the empty options have been cached.

It's unclear how many commands are affected, but this patch attempts to
at least detect some already in the testing framework.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>
---
 t/t9902-completion.sh | 33 ++++++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 7 deletions(-)

diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index 43cf313a1c..1319c542e1 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -122,6 +122,15 @@ test_gitcomp_nl ()
 	test_cmp expected out
 }
 
+offgit ()
+{
+	GIT_CEILING_DIRECTORIES="$ROOT" &&
+	export GIT_CEILING_DIRECTORIES &&
+	test_when_finished "ROOT='$ROOT'; cd '$TRASH_DIRECTORY'; unset GIT_CEILING_DIRECTORIES" &&
+	ROOT="$ROOT"/non-repo &&
+	cd "$ROOT"
+}
+
 invalid_variable_name='${foo.bar}'
 
 actual="$TRASH_DIRECTORY/actual"
@@ -358,10 +367,8 @@ test_expect_success SYMLINKS '__git_find_repo_path - resulting path avoids symli
 '
 
 test_expect_success '__git_find_repo_path - not a git repository' '
+	offgit &&
 	(
-		cd non-repo &&
-		GIT_CEILING_DIRECTORIES="$ROOT" &&
-		export GIT_CEILING_DIRECTORIES &&
 		test_must_fail __git_find_repo_path &&
 		printf "$__git_repo_path" >"$actual"
 	) &&
@@ -1388,6 +1395,7 @@ test_expect_success '__git_pretty_aliases' '
 '
 
 test_expect_success 'basic' '
+	offgit &&
 	run_completion "git " &&
 	# built-in
 	grep -q "^add \$" out &&
@@ -1401,6 +1409,7 @@ test_expect_success 'basic' '
 '
 
 test_expect_success 'double dash "git" itself' '
+	offgit &&
 	test_completion "git --" <<-\EOF
 	--paginate Z
 	--no-pager Z
@@ -1419,7 +1428,8 @@ test_expect_success 'double dash "git" itself' '
 	EOF
 '
 
-test_expect_success 'double dash "git checkout"' '
+test_expect_failure 'double dash "git checkout"' '
+	offgit &&
 	test_completion "git checkout --" <<-\EOF
 	--quiet Z
 	--detach Z
@@ -1442,6 +1452,7 @@ test_expect_success 'double dash "git checkout"' '
 '
 
 test_expect_success 'general options' '
+	offgit &&
 	test_completion "git --ver" "--version " &&
 	test_completion "git --hel" "--help " &&
 	test_completion "git --exe" <<-\EOF &&
@@ -1460,6 +1471,7 @@ test_expect_success 'general options' '
 '
 
 test_expect_success 'general options plus command' '
+	offgit &&
 	test_completion "git --version check" "checkout " &&
 	test_completion "git --paginate check" "checkout " &&
 	test_completion "git --git-dir=foo check" "checkout " &&
@@ -1480,11 +1492,13 @@ test_expect_success 'general options plus command' '
 '
 
 test_expect_success 'git --help completion' '
+	offgit &&
 	test_completion "git --help ad" "add " &&
 	test_completion "git --help core" "core-tutorial "
 '
 
-test_expect_success 'completion.commands removes multiple commands' '
+test_expect_failure 'completion.commands removes multiple commands' '
+	offgit &&
 	test_config completion.commands "-cherry -mergetool" &&
 	git --list-cmds=list-mainporcelain,list-complete,config >out &&
 	! grep -E "^(cherry|mergetool)$" out
@@ -1547,7 +1561,8 @@ test_expect_success 'complete tree filename with metacharacters' '
 	EOF
 '
 
-test_expect_success PERL 'send-email' '
+test_expect_failure PERL 'send-email' '
+	offgit &&
 	test_completion "git send-email --cov" "--cover-letter " &&
 	test_completion "git send-email ma" "master "
 '
@@ -1649,6 +1664,7 @@ test_expect_success 'completion used <cmd> completion for alias: !f() { : git <c
 '
 
 test_expect_success 'completion without explicit _git_xxx function' '
+	offgit &&
 	test_completion "git version --" <<-\EOF
 	--build-options Z
 	--no-build-options Z
@@ -1699,13 +1715,15 @@ do
 done
 
 test_expect_success 'sourcing the completion script clears cached commands' '
+	offgit &&
 	__git_compute_all_commands &&
 	verbose test -n "$__git_all_commands" &&
 	. "$GIT_BUILD_DIR/contrib/completion/git-completion.bash" &&
 	verbose test -z "$__git_all_commands"
 '
 
-test_expect_success 'sourcing the completion script clears cached merge strategies' '
+test_expect_failure 'sourcing the completion script clears cached merge strategies' '
+	offgit &&
 	GIT_TEST_GETTEXT_POISON= &&
 	__git_compute_merge_strategies &&
 	verbose test -n "$__git_merge_strategies" &&
@@ -1714,6 +1732,7 @@ test_expect_success 'sourcing the completion script clears cached merge strategi
 '
 
 test_expect_success 'sourcing the completion script clears cached --options' '
+	offgit &&
 	__gitcomp_builtin checkout &&
 	verbose test -n "$__gitcomp_builtin_checkout" &&
 	__gitcomp_builtin notes_edit &&
-- 
2.21.0