[PATCH v2] test-lib: user-friendly alternatives to test [!] [-d|-f]

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The helper functions are implemented, documented, and used in a few
places to validate them, but not everywhere to avoid useless code churn.

Signed-off-by: Matthieu Moy <Matthieu.Moy@xxxxxxx>
---
Sooooory, the first version was plain broken (the tests did not even
pass anymore), forget it. This should be better.

 t/README                      |    8 ++++++++
 t/t3404-rebase-interactive.sh |   18 +++++++++---------
 t/t3407-rebase-abort.sh       |    6 +++---
 t/test-lib.sh                 |   32 ++++++++++++++++++++++++++++++++
 4 files changed, 52 insertions(+), 12 deletions(-)

diff --git a/t/README b/t/README
index 0d1183c..be760b9 100644
--- a/t/README
+++ b/t/README
@@ -467,6 +467,14 @@ library for your script to use.
    <expected> file.  This behaves like "cmp" but produces more
    helpful output when the test is run with "-v" option.
 
+ - test_file_must_exist <file> [<diagnosis>]
+   test_file_must_not_exist <file> [<diagnosis>]
+   test_dir_must_exist <dir> [<diagnosis>]
+   test_dir_must_not_exist <dir> [<diagnosis>]
+
+   check whether a file/directory exists or doesn't. <diagnosis> will
+   be displayed if the test fails.
+
  - test_when_finished <script>
 
    Prepend <script> to a list of commands to run to clean up
diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index bba220a..50787c2 100755
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -69,18 +69,18 @@ test_expect_success 'rebase -i with the exec command' '
 	FAKE_LINES="1 exec_touch_touch-one 2 exec_touch_touch-two exec_false exec_touch_touch-three 3 4
 		exec_touch_\"touch-file__name_with_spaces\";_touch_touch-after-semicolon 5" \
 		test_must_fail git rebase -i A &&
-	test -f touch-one &&
-	test -f touch-two &&
-	! test -f touch-three &&
+	test_file_must_exist touch-one &&
+	test_file_must_exist touch-two &&
+	test_file_must_not_exist touch-three "(Rebase should have stopped before)" &&
 	test $(git rev-parse C) = $(git rev-parse HEAD) || {
 		echo "Stopped at wrong revision:"
 		echo "($(git describe --tags HEAD) instead of C)"
 		false
 	} &&
 	git rebase --continue &&
-	test -f touch-three &&
-	test -f "touch-file  name with spaces" &&
-	test -f touch-after-semicolon &&
+	test_file_must_exist touch-three &&
+	test_file_must_exist "touch-file  name with spaces" &&
+	test_file_must_exist touch-after-semicolon &&
 	test $(git rev-parse master) = $(git rev-parse HEAD) || {
 		echo "Stopped at wrong revision:"
 		echo "($(git describe --tags HEAD) instead of master)"
@@ -95,7 +95,7 @@ test_expect_success 'rebase -i with the exec command runs from tree root' '
 	FAKE_LINES="1 exec_touch_touch-subdir" \
 		git rebase -i HEAD^ &&
 	cd .. &&
-	test -f touch-subdir &&
+	test_file_must_exist touch-subdir &&
 	rm -fr subdir
 '
 
@@ -178,7 +178,7 @@ test_expect_success 'abort' '
 	git rebase --abort &&
 	test $(git rev-parse new-branch1) = $(git rev-parse HEAD) &&
 	test "$(git symbolic-ref -q HEAD)" = "refs/heads/branch1" &&
-	! test -d .git/rebase-merge
+	test_dir_must_not_exist .git/rebase-merge
 '
 
 test_expect_success 'abort with error when new base cannot be checked out' '
@@ -187,7 +187,7 @@ test_expect_success 'abort with error when new base cannot be checked out' '
 	test_must_fail git rebase -i master > output 2>&1 &&
 	grep "Untracked working tree file .file1. would be overwritten" \
 		output &&
-	! test -d .git/rebase-merge &&
+	test_dir_must_not_exist .git/rebase-merge &&
 	git reset --hard HEAD^
 '
 
diff --git a/t/t3407-rebase-abort.sh b/t/t3407-rebase-abort.sh
index 2999e78..0ca81fe 100755
--- a/t/t3407-rebase-abort.sh
+++ b/t/t3407-rebase-abort.sh
@@ -38,7 +38,7 @@ testrebase() {
 		# Clean up the state from the previous one
 		git reset --hard pre-rebase &&
 		test_must_fail git rebase$type master &&
-		test -d "$dotest" &&
+		test_dir_must_exist "$dotest" &&
 		git rebase --abort &&
 		test $(git rev-parse to-rebase) = $(git rev-parse pre-rebase) &&
 		test ! -d "$dotest"
@@ -49,7 +49,7 @@ testrebase() {
 		# Clean up the state from the previous one
 		git reset --hard pre-rebase &&
 		test_must_fail git rebase$type master &&
-		test -d "$dotest" &&
+		test_dir_must_exist "$dotest" &&
 		test_must_fail git rebase --skip &&
 		test $(git rev-parse HEAD) = $(git rev-parse master) &&
 		git rebase --abort &&
@@ -62,7 +62,7 @@ testrebase() {
 		# Clean up the state from the previous one
 		git reset --hard pre-rebase &&
 		test_must_fail git rebase$type master &&
-		test -d "$dotest" &&
+		test_dir_must_exist "$dotest" &&
 		echo c > a &&
 		echo d >> a &&
 		git add a &&
diff --git a/t/test-lib.sh b/t/test-lib.sh
index e8f21d5..694bbe8 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -541,6 +541,38 @@ test_external_without_stderr () {
 	fi
 }
 
+# debugging-friendly alternatives to "test [!] [-f|-d]"
+# The commands test the existence or non-existance of $1. $2 can be
+# given to provide a more precise diagnosis.
+test_file_must_exist () {
+	if ! [ -f "$1" ]; then
+		echo "file $1 doesn't exist. $*"
+		false
+	fi
+}
+
+test_file_must_not_exist () {
+	if [ -f "$1" ]; then
+		echo "file $1 exists. $*"
+		false
+	fi
+}
+
+test_dir_must_exist () {
+	if ! [ -d "$1" ]; then
+		echo "directory $1 doesn't exist. $*"
+		false
+	fi
+}
+
+test_dir_must_not_exist () {
+	if [ -d "$1" ]; then
+		echo "directory $1 exists. $*"
+		false
+	fi
+}
+
+
 # This is not among top-level (test_expect_success | test_expect_failure)
 # but is a prefix that can be used in the test script, like:
 #
-- 
1.7.2.1.30.g18195

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