t7503: verify proper hook execution

t7503 did not verify that the expected hooks actually ran during
testing. Fix that by making the hook scripts write their $0 into a file
so that we can compare actual execution vs. expected execution.

While we're at it, do some test style cleanups, such as using
write_script() and doing setup inside a test_expect_success block.

Improved-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7503-pre-commit-hook.sh

@@ -4,124 +4,144 @@ test_description='pre-commit hook'
 
 . ./test-lib.sh
 
-test_expect_success 'with no hook' '
+HOOKDIR="$(git rev-parse --git-dir)/hooks"
+PRECOMMIT="$HOOKDIR/pre-commit"
+
+# Prepare sample scripts that write their $0 to actual_hooks
+test_expect_success 'sample script setup' '
+	mkdir -p "$HOOKDIR" &&
+	write_script "$HOOKDIR/success.sample" <<-\EOF &&
+	echo $0 >>actual_hooks
+	exit 0
+	EOF
+	write_script "$HOOKDIR/fail.sample" <<-\EOF &&
+	echo $0 >>actual_hooks
+	exit 1
+	EOF
+	write_script "$HOOKDIR/non-exec.sample" <<-\EOF &&
+	echo $0 >>actual_hooks
+	exit 1
+	EOF
+	chmod -x "$HOOKDIR/non-exec.sample" &&
+	write_script "$HOOKDIR/require-prefix.sample" <<-\EOF &&
+	echo $0 >>actual_hooks
+	test $GIT_PREFIX = "success/"
+	EOF
+	write_script "$HOOKDIR/check-author.sample" <<-\EOF
+	echo $0 >>actual_hooks
+	test "$GIT_AUTHOR_NAME" = "New Author" &&
+	test "$GIT_AUTHOR_EMAIL" = "newauthor@example.com"
+	EOF
+'
 
-	echo "foo" > file &&
+test_expect_success 'with no hook' '
+	test_when_finished "rm -f actual_hooks" &&
+	echo "foo" >file &&
 	git add file &&
-	git commit -m "first"
+	git commit -m "first" &&
-
+	test_path_is_missing actual_hooks
 '
 
 test_expect_success '--no-verify with no hook' '
-
+	test_when_finished "rm -f actual_hooks" &&
-	echo "bar" > file &&
+	echo "bar" >file &&
 	git add file &&
-	git commit --no-verify -m "bar"
+	git commit --no-verify -m "bar" &&
-
+	test_path_is_missing actual_hooks
 '
 
-# now install hook that always succeeds
-HOOKDIR="$(git rev-parse --git-dir)/hooks"
-HOOK="$HOOKDIR/pre-commit"
-mkdir -p "$HOOKDIR"
-cat > "$HOOK" <<EOF
-#!/bin/sh
-exit 0
-EOF
-chmod +x "$HOOK"
-
 test_expect_success 'with succeeding hook' '
-
+	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
-	echo "more" >> file &&
+	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
+	echo "$PRECOMMIT" >expected_hooks &&
+	echo "more" >>file &&
 	git add file &&
-	git commit -m "more"
+	git commit -m "more" &&
-
+	test_cmp expected_hooks actual_hooks
 '
 
 test_expect_success '--no-verify with succeeding hook' '
-
+	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
-	echo "even more" >> file &&
+	cp "$HOOKDIR/success.sample" "$PRECOMMIT" &&
+	echo "even more" >>file &&
 	git add file &&
-	git commit --no-verify -m "even more"
+	git commit --no-verify -m "even more" &&
-
+	test_path_is_missing actual_hooks
 '
 
-# now a hook that fails
-cat > "$HOOK" <<EOF
-#!/bin/sh
-exit 1
-EOF
-
 test_expect_success 'with failing hook' '
-
+	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
-	echo "another" >> file &&
+	cp "$HOOKDIR/fail.sample" "$PRECOMMIT" &&
+	echo "$PRECOMMIT" >expected_hooks &&
+	echo "another" >>file &&
 	git add file &&
-	test_must_fail git commit -m "another"
+	test_must_fail git commit -m "another" &&
-
+	test_cmp expected_hooks actual_hooks
 '
 
 test_expect_success '--no-verify with failing hook' '
-
+	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
-	echo "stuff" >> file &&
+	cp "$HOOKDIR/fail.sample" "$PRECOMMIT" &&
+	echo "stuff" >>file &&
 	git add file &&
-	git commit --no-verify -m "stuff"
+	git commit --no-verify -m "stuff" &&
-
+	test_path_is_missing actual_hooks
 '
 
-chmod -x "$HOOK"
 test_expect_success POSIXPERM 'with non-executable hook' '
-
+	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
-	echo "content" >> file &&
+	cp "$HOOKDIR/non-exec.sample" "$PRECOMMIT" &&
+	echo "content" >>file &&
 	git add file &&
-	git commit -m "content"
+	git commit -m "content" &&
-
+	test_path_is_missing actual_hooks
 '
 
 test_expect_success POSIXPERM '--no-verify with non-executable hook' '
-
+	test_when_finished "rm -f \"$PRECOMMIT\" actual_hooks" &&
-	echo "more content" >> file &&
+	cp "$HOOKDIR/non-exec.sample" "$PRECOMMIT" &&
+	echo "more content" >>file &&
 	git add file &&
-	git commit --no-verify -m "more content"
+	git commit --no-verify -m "more content" &&
-
+	test_path_is_missing actual_hooks
 '
-chmod +x "$HOOK"
-
-# a hook that checks $GIT_PREFIX and succeeds inside the
-# success/ subdirectory only
-cat > "$HOOK" <<EOF
-#!/bin/sh
-test \$GIT_PREFIX = success/
-EOF
 
 test_expect_success 'with hook requiring GIT_PREFIX' '
-
+	test_when_finished "rm -rf \"$PRECOMMIT\" expected_hooks actual_hooks success" &&
-	echo "more content" >> file &&
+	cp "$HOOKDIR/require-prefix.sample" "$PRECOMMIT" &&
+	echo "$PRECOMMIT" >expected_hooks &&
+	echo "more content" >>file &&
 	git add file &&
 	mkdir success &&
 	(
 		cd success &&
 		git commit -m "hook requires GIT_PREFIX = success/"
 	) &&
-	rmdir success
+	test_cmp expected_hooks actual_hooks
 '
 
 test_expect_success 'with failing hook requiring GIT_PREFIX' '
-
+	test_when_finished "rm -rf \"$PRECOMMIT\" expected_hooks actual_hooks fail" &&
-	echo "more content" >> file &&
+	cp "$HOOKDIR/require-prefix.sample" "$PRECOMMIT" &&
+	echo "$PRECOMMIT" >expected_hooks &&
+	echo "more content" >>file &&
 	git add file &&
 	mkdir fail &&
 	(
 		cd fail &&
 		test_must_fail git commit -m "hook must fail"
 	) &&
-	rmdir fail &&
+	git checkout -- file &&
-	git checkout -- file
+	test_cmp expected_hooks actual_hooks
 '
 
 test_expect_success 'check the author in hook' '
-	write_script "$HOOK" <<-\EOF &&
+	test_when_finished "rm -f \"$PRECOMMIT\" expected_hooks actual_hooks" &&
-	test "$GIT_AUTHOR_NAME" = "New Author" &&
+	cp "$HOOKDIR/check-author.sample" "$PRECOMMIT" &&
-	test "$GIT_AUTHOR_EMAIL" = "newauthor@example.com"
+	cat >expected_hooks <<-EOF &&
+	$PRECOMMIT
+	$PRECOMMIT
+	$PRECOMMIT
 	EOF
 	test_must_fail git commit --allow-empty -m "by a.u.thor" &&
 	(
@@ -133,7 +153,8 @@ test_expect_success 'check the author in hook' '
 	) &&
 	git commit --author="New Author <newauthor@example.com>" \
 		--allow-empty -m "by new.author via command line" &&
-	git show -s
+	git show -s &&
+	test_cmp expected_hooks actual_hooks
 '
 
 test_done