Merge branch 'en/t7406-fixes'

Test fixes.

* en/t7406-fixes:
  t7406: avoid using test_must_fail for commands other than git
  t7406: prefer test_* helper functions to test -[feds]
  t7406: avoid having git commands upstream of a pipe
  t7406: simplify by using diff --name-only instead of diff --raw
  t7406: fix call that was failing for the wrong reason

t/t7406-submodule-update.sh

@@ -175,7 +175,7 @@ test_expect_success 'submodule update does not fetch already present commits' '
 	  git submodule update > ../actual 2> ../actual.err
 	) &&
 	test_i18ncmp expected actual &&
-	! test -s actual.err
+	test_must_be_empty actual.err
 '
 test_expect_success 'submodule update should fail due to local changes' '
@@ -482,7 +482,8 @@ test_expect_success 'recursive submodule update - command in .git/config catches
 test_expect_success 'submodule init does not copy command into .git/config' '
 	(cd super &&
-	 H=$(git ls-files -s submodule | cut -d" " -f2) &&
+	 git ls-files -s submodule >out &&
+	 H=$(cut -d" " -f2 out) &&
 	 mkdir submodule1 &&
 	 git update-index --add --cacheinfo 160000 $H submodule1 &&
 	 git config -f .gitmodules submodule.submodule1.path submodule1 &&
@@ -580,9 +581,11 @@ test_expect_success 'submodule update - update=none in .git/config' '
 	  git checkout master &&
 	  compare_head
 	 ) &&
-	 git diff --raw | grep "	submodule" &&
+	 git diff --name-only >out &&
+	 grep ^submodule$ out &&
 	 git submodule update &&
-	 git diff --raw | grep "	submodule" &&
+	 git diff --name-only >out &&
+	 grep ^submodule$ out &&
 	 (cd submodule &&
 	  compare_head
 	 ) &&
@@ -598,11 +601,13 @@ test_expect_success 'submodule update - update=none in .git/config but --checkou
 	  git checkout master &&
 	  compare_head
 	 ) &&
-	 git diff --raw | grep "	submodule" &&
+	 git diff --name-only >out &&
+	 grep ^submodule$ out &&
 	 git submodule update --checkout &&
-	 test_must_fail git diff --raw \| grep "	submodule" &&
+	 git diff --name-only >out &&
+	 ! grep ^submodule$ out &&
 	 (cd submodule &&
-	  test_must_fail compare_head
+	  ! compare_head
 	 ) &&
 	 git config --unset submodule.submodule.update
 	)
@@ -616,8 +621,8 @@ test_expect_success 'submodule update --init skips submodule with update=none' '
 	git clone super cloned &&
 	(cd cloned &&
 	 git submodule update --init &&
-	 test -e submodule/.git &&
-	 test_must_fail test -e none/.git
+	 test_path_exists submodule/.git &&
+	 test_path_is_missing none/.git
 	)
 '
@@ -886,7 +891,8 @@ test_expect_success 'submodule update properly revives a moved submodule' '
 	 H=$(git rev-parse --short HEAD) &&
 	 git commit -am "pre move" &&
 	 H2=$(git rev-parse --short HEAD) &&
-	 git status | sed "s/$H/XXX/" >expect &&
+	 git status >out &&
+	 sed "s/$H/XXX/" out >expect &&
 	 H=$(cd submodule2 && git rev-parse HEAD) &&
 	 git rm --cached submodule2 &&
 	 rm -rf submodule2 &&
@@ -895,7 +901,8 @@ test_expect_success 'submodule update properly revives a moved submodule' '
 	 git config -f .gitmodules submodule.submodule2.path "moved/sub module" &&
 	 git commit -am "post move" &&
 	 git submodule update &&
-	 git status | sed "s/$H2/XXX/" >actual &&
+	 git status > out &&
+	 sed "s/$H2/XXX/" out >actual &&
 	 test_cmp expect actual
 	)
 '
@@ -913,7 +920,7 @@ test_expect_success SYMLINKS 'submodule update can handle symbolic links in pwd'
 test_expect_success 'submodule update clone shallow submodule' '
 	test_when_finished "rm -rf super3" &&
-	first=$(git -C cloned submodule status submodule |cut -c2-41) &&
+	first=$(git -C cloned rev-parse HEAD:submodule) &&
 	second=$(git -C submodule rev-parse HEAD) &&
 	commit_count=$(git -C submodule rev-list --count $first^..$second) &&
 	git clone cloned super3 &&
@@ -923,7 +930,8 @@ test_expect_success 'submodule update clone shallow submodule' '
 		sed -e "s#url = ../#url = file://$pwd/#" <.gitmodules >.gitmodules.tmp &&
 		mv -f .gitmodules.tmp .gitmodules &&
 		git submodule update --init --depth=$commit_count &&
-		test 1 = $(git -C submodule log --oneline | wc -l)
+		git -C submodule log --oneline >out &&
+		test_line_count = 1 out
 	)
 '
@@ -939,7 +947,8 @@ test_expect_success 'submodule update clone shallow submodule outside of depth'
 		test_i18ngrep "Direct fetching of that commit failed." actual &&
 		git -C ../submodule config uploadpack.allowReachableSHA1InWant true &&
 		git submodule update --init --depth=1 >actual &&
-		test 1 = $(git -C submodule log --oneline | wc -l)
+		git -C submodule log --oneline >out &&
+		test_line_count = 1 out
 	)
 '

t/test-lib-functions.sh

@@ -565,6 +565,14 @@ test_path_is_dir () {
 	fi
 }
+test_path_exists () {
+	if ! test -e "$1"
+	then
+		echo "Path $1 doesn't exist. $2"
+		false
+	fi
+}
+
 # Check if the directory exists and is empty as expected, barf otherwise.
 test_dir_is_empty () {
 	test_path_is_dir "$1" &&