don't use test_must_fail with grep

test_must_fail should only be used for testing git commands. To test the
failure of other commands use `!`.

Reported-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3510-cherry-pick-sequence.sh

@@ -375,7 +375,7 @@ test_expect_success '--continue respects opts' '
 	git cat-file commit HEAD~1 >picked_msg &&
 	git cat-file commit HEAD~2 >unrelatedpick_msg &&
 	git cat-file commit HEAD~3 >initial_msg &&
-	test_must_fail grep "cherry picked from" initial_msg &&
+	! grep "cherry picked from" initial_msg &&
 	grep "cherry picked from" unrelatedpick_msg &&
 	grep "cherry picked from" picked_msg &&
 	grep "cherry picked from" anotherpick_msg
@@ -416,9 +416,9 @@ test_expect_failure '--signoff is automatically propagated to resolved conflict'
 	git cat-file commit HEAD~1 >picked_msg &&
 	git cat-file commit HEAD~2 >unrelatedpick_msg &&
 	git cat-file commit HEAD~3 >initial_msg &&
-	test_must_fail grep "Signed-off-by:" initial_msg &&
+	! grep "Signed-off-by:" initial_msg &&
 	grep "Signed-off-by:" unrelatedpick_msg &&
-	test_must_fail grep "Signed-off-by:" picked_msg &&
+	! grep "Signed-off-by:" picked_msg &&
 	grep "Signed-off-by:" anotherpick_msg
 '
 

t/t5504-fetch-receive-strict.sh

@@ -152,7 +152,7 @@ test_expect_success 'push with receive.fsck.missingEmail=warn' '
 	git --git-dir=dst/.git config --add \
 		receive.fsck.badDate warn &&
 	git push --porcelain dst bogus >act 2>&1 &&
-	test_must_fail grep "missingEmail" act
+	! grep "missingEmail" act
 '
 
 test_expect_success \

t/t5516-fetch-push.sh

@@ -1004,7 +1004,7 @@ test_expect_success 'push --porcelain' '
 test_expect_success 'push --porcelain bad url' '
 	mk_empty testrepo &&
 	test_must_fail git push >.git/bar --porcelain asdfasdfasd refs/heads/master:refs/remotes/origin/master &&
-	test_must_fail grep -q Done .git/bar
+	! grep -q Done .git/bar
 '
 
 test_expect_success 'push --porcelain rejected' '

t/t5601-clone.sh

@@ -151,7 +151,7 @@ test_expect_success 'clone --mirror does not repeat tags' '
 	git clone --mirror src mirror2 &&
 	(cd mirror2 &&
 	 git show-ref 2> clone.err > clone.out) &&
-	test_must_fail grep Duplicate mirror2/clone.err &&
+	! grep Duplicate mirror2/clone.err &&
 	grep some-tag mirror2/clone.out
 
 '

t/t6030-bisect-porcelain.sh

@@ -407,7 +407,7 @@ test_expect_success 'good merge base when good and bad are siblings' '
 	test_i18ngrep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH4 my_bisect_log.txt &&
 	git bisect good > my_bisect_log.txt &&
-	test_must_fail grep "merge base must be tested" my_bisect_log.txt &&
+	! grep "merge base must be tested" my_bisect_log.txt &&
 	grep $HASH6 my_bisect_log.txt &&
 	git bisect reset
 '

t/t7610-mergetool.sh

@@ -601,7 +601,7 @@ test_expect_success MKTEMP 'temporary filenames are used with mergetool.writeToT
 	test_config mergetool.myecho.trustExitCode true &&
 	test_must_fail git merge master &&
 	git mergetool --no-prompt --tool myecho -- both >actual &&
-	test_must_fail grep ^\./both_LOCAL_ actual >/dev/null &&
+	! grep ^\./both_LOCAL_ actual >/dev/null &&
 	grep /both_LOCAL_ actual >/dev/null &&
 	git reset --hard master >/dev/null 2>&1
 '

t/t9001-send-email.sh

@@ -50,7 +50,7 @@ test_no_confirm () {
 		--smtp-server="$(pwd)/fake.sendmail" \
 		$@ \
 		$patches >stdout &&
-		test_must_fail grep "Send this email" stdout &&
+		! grep "Send this email" stdout &&
 		>no_confirm_okay
 }
 

t/t9117-git-svn-init-clone.sh

@@ -55,7 +55,7 @@ test_expect_success 'clone to target directory with --stdlayout' '
 test_expect_success 'init without -s/-T/-b/-t does not warn' '
 	test ! -d trunk &&
 	git svn init "$svnrepo"/project/trunk trunk 2>warning &&
-	test_must_fail grep -q prefix warning &&
+	! grep -q prefix warning &&
 	rm -rf trunk &&
 	rm -f warning
 	'
@@ -63,7 +63,7 @@ test_expect_success 'init without -s/-T/-b/-t does not warn' '
 test_expect_success 'clone without -s/-T/-b/-t does not warn' '
 	test ! -d trunk &&
 	git svn clone "$svnrepo"/project/trunk 2>warning &&
-	test_must_fail grep -q prefix warning &&
+	! grep -q prefix warning &&
 	rm -rf trunk &&
 	rm -f warning
 	'
@@ -86,7 +86,7 @@ EOF
 test_expect_success 'init with -s/-T/-b/-t assumes --prefix=origin/' '
 	test ! -d project &&
 	git svn init -s "$svnrepo"/project project 2>warning &&
-	test_must_fail grep -q prefix warning &&
+	! grep -q prefix warning &&
 	test_svn_configured_prefix "origin/" &&
 	rm -rf project &&
 	rm -f warning
@@ -95,7 +95,7 @@ test_expect_success 'init with -s/-T/-b/-t assumes --prefix=origin/' '
 test_expect_success 'clone with -s/-T/-b/-t assumes --prefix=origin/' '
 	test ! -d project &&
 	git svn clone -s "$svnrepo"/project 2>warning &&
-	test_must_fail grep -q prefix warning &&
+	! grep -q prefix warning &&
 	test_svn_configured_prefix "origin/" &&
 	rm -rf project &&
 	rm -f warning
@@ -104,7 +104,7 @@ test_expect_success 'clone with -s/-T/-b/-t assumes --prefix=origin/' '
 test_expect_success 'init with -s/-T/-b/-t and --prefix "" still works' '
 	test ! -d project &&
 	git svn init -s "$svnrepo"/project project --prefix "" 2>warning &&
-	test_must_fail grep -q prefix warning &&
+	! grep -q prefix warning &&
 	test_svn_configured_prefix "" &&
 	rm -rf project &&
 	rm -f warning
@@ -113,7 +113,7 @@ test_expect_success 'init with -s/-T/-b/-t and --prefix "" still works' '
 test_expect_success 'clone with -s/-T/-b/-t and --prefix "" still works' '
 	test ! -d project &&
 	git svn clone -s "$svnrepo"/project --prefix "" 2>warning &&
-	test_must_fail grep -q prefix warning &&
+	! grep -q prefix warning &&
 	test_svn_configured_prefix "" &&
 	rm -rf project &&
 	rm -f warning

t/t9813-git-p4-preserve-users.sh

@@ -126,13 +126,13 @@ test_expect_success 'not preserving user with mixed authorship' '
 		grep "git author charlie@example.com does not match" &&
 
 		make_change_by_user usernamefile3 alice alice@example.com &&
-		git p4 commit |\
-		test_must_fail grep "git author.*does not match" &&
+		git p4 commit >actual &&
+		! grep "git author.*does not match" actual &&
 
 		git config git-p4.skipUserNameCheck true &&
 		make_change_by_user usernamefile3 Charlie charlie@example.com &&
-		git p4 commit |\
-		test_must_fail grep "git author.*does not match" &&
+		git p4 commit >actual &&
+		! grep "git author.*does not match" actual &&
 
 		p4_check_commit_author usernamefile3 alice
 	)

t/t9814-git-p4-rename.sh

@@ -141,7 +141,7 @@ test_expect_success 'detect copies' '
 		git diff-tree -r -C HEAD &&
 		git p4 submit &&
 		p4 filelog //depot/file8 &&
-		p4 filelog //depot/file8 | test_must_fail grep -q "branch from" &&
+		! p4 filelog //depot/file8 | grep -q "branch from" &&
 
 		echo "file9" >>file2 &&
 		git commit -a -m "Differentiate file2" &&
@@ -154,7 +154,7 @@ test_expect_success 'detect copies' '
 		git config git-p4.detectCopies true &&
 		git p4 submit &&
 		p4 filelog //depot/file9 &&
-		p4 filelog //depot/file9 | test_must_fail grep -q "branch from" &&
+		! p4 filelog //depot/file9 | grep -q "branch from" &&
 
 		echo "file10" >>file2 &&
 		git commit -a -m "Differentiate file2" &&
@@ -202,7 +202,7 @@ test_expect_success 'detect copies' '
 		git config git-p4.detectCopies $(($level + 2)) &&
 		git p4 submit &&
 		p4 filelog //depot/file12 &&
-		p4 filelog //depot/file12 | test_must_fail grep -q "branch from" &&
+		! p4 filelog //depot/file12 | grep -q "branch from" &&
 
 		echo "file13" >>file2 &&
 		git commit -a -m "Differentiate file2" &&