t3700: avoid suppressing git's exit code

Replace pipelines involving git commands with temporary files (actual)
to ensure that any crashes or unexpected exit codes from the git
commands are properly caught by the test suite. A simple pipeline
like 'git foo | grep bar' ignores the exit code of 'git', which
can hide regressions.

In cases where we were counting lines with 'wc -l' to ensure a
pattern was absent, simplify the logic to use '! grep' to avoid
subshells entirely.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Siddharth Shrimali <r.siddharth.shrimali@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: SiddharthShrimali

t/t3700-add.sh

@@ -38,7 +38,8 @@ test_expect_success 'Test with no pathspecs' '
 '
 
 test_expect_success 'Post-check that foo is in the index' '
-	git ls-files foo | grep foo
+	git ls-files foo >actual &&
+	grep foo actual
 '
 
 test_expect_success 'Test that "git add -- -q" works' '
@@ -195,8 +196,9 @@ test_expect_success 'git add with filemode=0, symlinks=0, and unmerged entries'
 	echo new > file &&
 	echo new > symlink &&
 	git add file symlink &&
-	git ls-files --stage | grep "^100755 .* 0	file$" &&
-	git ls-files --stage | grep "^120000 .* 0	symlink$"
+	git ls-files --stage >actual &&
+	grep "^100755 .* 0	file$" actual &&
+	grep "^120000 .* 0	symlink$" actual
 '
 
 test_expect_success 'git add with filemode=0, symlinks=0 prefers stage 2 over stage 1' '
@@ -212,8 +214,9 @@ test_expect_success 'git add with filemode=0, symlinks=0 prefers stage 2 over st
 	echo new > file &&
 	echo new > symlink &&
 	git add file symlink &&
-	git ls-files --stage | grep "^100755 .* 0	file$" &&
-	git ls-files --stage | grep "^120000 .* 0	symlink$"
+	git ls-files --stage >actual &&
+	grep "^100755 .* 0	file$" actual &&
+	grep "^120000 .* 0	symlink$" actual
 '
 
 test_expect_success 'git add --refresh' '
@@ -254,7 +257,8 @@ test_expect_success POSIXPERM,SANITY 'git add should fail atomically upon an unr
 	date >foo2 &&
 	chmod 0 foo2 &&
 	test_must_fail git add --verbose . &&
-	! ( git ls-files foo1 | grep foo1 )
+	git ls-files foo1 >actual &&
+	! grep foo1 actual
 '
 
 rm -f foo2
@@ -265,7 +269,8 @@ test_expect_success POSIXPERM,SANITY 'git add --ignore-errors' '
 	date >foo2 &&
 	chmod 0 foo2 &&
 	test_must_fail git add --verbose --ignore-errors . &&
-	git ls-files foo1 | grep foo1
+	git ls-files foo1 >actual &&
+	grep foo1 actual
 '
 
 rm -f foo2
@@ -277,7 +282,8 @@ test_expect_success POSIXPERM,SANITY 'git add (add.ignore-errors)' '
 	date >foo2 &&
 	chmod 0 foo2 &&
 	test_must_fail git add --verbose . &&
-	git ls-files foo1 | grep foo1
+	git ls-files foo1 >actual &&
+	grep foo1 actual
 '
 rm -f foo2
 
@@ -288,7 +294,8 @@ test_expect_success POSIXPERM,SANITY 'git add (add.ignore-errors = false)' '
 	date >foo2 &&
 	chmod 0 foo2 &&
 	test_must_fail git add --verbose . &&
-	! ( git ls-files foo1 | grep foo1 )
+	git ls-files foo1 >actual &&
+	! grep foo1 actual
 '
 rm -f foo2
 
@@ -299,7 +306,8 @@ test_expect_success POSIXPERM,SANITY '--no-ignore-errors overrides config' '
 	date >foo2 &&
 	chmod 0 foo2 &&
 	test_must_fail git add --verbose --no-ignore-errors . &&
-	! ( git ls-files foo1 | grep foo1 ) &&
+	git ls-files foo1 >actual &&
+	! grep foo1 actual &&
 	git config add.ignore-errors 0
 '
 rm -f foo2
@@ -308,8 +316,10 @@ test_expect_success BSLASHPSPEC "git add 'fo\\[ou\\]bar' ignores foobar" '
 	git reset --hard &&
 	touch fo\[ou\]bar foobar &&
 	git add '\''fo\[ou\]bar'\'' &&
-	git ls-files fo\[ou\]bar | grep -F fo\[ou\]bar &&
-	! ( git ls-files foobar | grep foobar )
+	git ls-files fo\[ou\]bar >actual &&
+	grep -F fo\[ou\]bar actual &&
+	git ls-files foobar >actual &&
+	! grep foobar actual
 '
 
 test_expect_success 'git add to resolve conflicts on otherwise ignored path' '
@@ -326,7 +336,8 @@ test_expect_success 'git add to resolve conflicts on otherwise ignored path' '
 
 test_expect_success '"add non-existent" should fail' '
 	test_must_fail git add non-existent &&
-	! (git ls-files | grep "non-existent")
+	git ls-files >actual &&
+	! grep "non-existent" actual
 '
 
 test_expect_success 'git add -A on empty repo does not error out' '
@@ -536,9 +547,11 @@ test_expect_success 'all statuses changed in folder if . is given' '
 		touch x y z sub/a sub/dir/b &&
 		git add -A &&
 		git add --chmod=+x . &&
-		test $(git ls-files --stage | grep ^100644 | wc -l) -eq 0 &&
+		git ls-files --stage >actual &&
+		! grep ^100644 actual &&
 		git add --chmod=-x . &&
-		test $(git ls-files --stage | grep ^100755 | wc -l) -eq 0
+		git ls-files --stage >actual &&
+		! grep ^100755 actual
 	)
 '