t: use test_expect_code instead of hand-rolled comparison

This makes our output in the event of a failure slightly
nicer, and it means that we do not break the &&-chain.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: peff

t/t0040-parse-options.sh

@@ -172,12 +172,9 @@ test_expect_success 'long options' '
 '
 
 test_expect_success 'missing required value' '
-	test-parse-options -s;
-	test $? = 129 &&
-	test-parse-options --string;
-	test $? = 129 &&
-	test-parse-options --file;
-	test $? = 129
+	test_expect_code 129 test-parse-options -s &&
+	test_expect_code 129 test-parse-options --string &&
+	test_expect_code 129 test-parse-options --file
 '
 
 cat > expect << EOF
@@ -227,8 +224,7 @@ test_expect_success 'unambiguously abbreviated option with "="' '
 '
 
 test_expect_success 'ambiguously abbreviated option' '
-	test-parse-options --strin 123;
-	test $? = 129
+	test_expect_code 129 test-parse-options --strin 123
 '
 
 cat > expect << EOF

t/t4035-diff-quiet.sh

@@ -29,67 +29,65 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'git diff-tree HEAD^ HEAD' '
-	git diff-tree --quiet HEAD^ HEAD >cnt
-	test $? = 1 && test_line_count = 0 cnt
+	test_expect_code 1 git diff-tree --quiet HEAD^ HEAD >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-tree HEAD^ HEAD -- a' '
-	git diff-tree --quiet HEAD^ HEAD -- a >cnt
-	test $? = 0 && test_line_count = 0 cnt
+	test_expect_code 0 git diff-tree --quiet HEAD^ HEAD -- a >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-tree HEAD^ HEAD -- b' '
-	git diff-tree --quiet HEAD^ HEAD -- b >cnt
-	test $? = 1 && test_line_count = 0 cnt
+	test_expect_code 1 git diff-tree --quiet HEAD^ HEAD -- b >cnt &&
+	test_line_count = 0 cnt
 '
 # this diff outputs one line: sha1 of the given head
 test_expect_success 'echo HEAD | git diff-tree --stdin' '
-	echo $(git rev-parse HEAD) | git diff-tree --quiet --stdin >cnt
-	test $? = 1 && test_line_count = 1 cnt
+	echo $(git rev-parse HEAD) |
+	test_expect_code 1 git diff-tree --quiet --stdin >cnt &&
+	test_line_count = 1 cnt
 '
 test_expect_success 'git diff-tree HEAD HEAD' '
-	git diff-tree --quiet HEAD HEAD >cnt
-	test $? = 0 && test_line_count = 0 cnt
+	test_expect_code 0 git diff-tree --quiet HEAD HEAD >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-files' '
-	git diff-files --quiet >cnt
-	test $? = 0 && test_line_count = 0 cnt
+	test_expect_code 0 git diff-files --quiet >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-index --cached HEAD' '
-	git diff-index --quiet --cached HEAD >cnt
-	test $? = 0 && test_line_count = 0 cnt
+	test_expect_code 0 git diff-index --quiet --cached HEAD >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-index --cached HEAD^' '
-	git diff-index --quiet --cached HEAD^ >cnt
-	test $? = 1 && test_line_count = 0 cnt
+	test_expect_code 1 git diff-index --quiet --cached HEAD^ >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-index --cached HEAD^' '
 	echo text >>b &&
 	echo 3 >c &&
-	git add . && {
-		git diff-index --quiet --cached HEAD^ >cnt
-		test $? = 1 && test_line_count = 0 cnt
-	}
+	git add . &&
+	test_expect_code 1 git diff-index --quiet --cached HEAD^ >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-tree -Stext HEAD^ HEAD -- b' '
-	git commit -m "text in b" && {
-		git diff-tree --quiet -Stext HEAD^ HEAD -- b >cnt
-		test $? = 1 && test_line_count = 0 cnt
-	}
+	git commit -m "text in b" &&
+	test_expect_code 1 git diff-tree --quiet -Stext HEAD^ HEAD -- b >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-tree -Snot-found HEAD^ HEAD -- b' '
-	git diff-tree --quiet -Snot-found HEAD^ HEAD -- b >cnt
-	test $? = 0 && test_line_count = 0 cnt
+	test_expect_code 0 git diff-tree --quiet -Snot-found HEAD^ HEAD -- b >cnt &&
+	test_line_count = 0 cnt
 '
 test_expect_success 'git diff-files' '
-	echo 3 >>c && {
-		git diff-files --quiet >cnt
-		test $? = 1 && test_line_count = 0 cnt
-	}
+	echo 3 >>c &&
+	test_expect_code 1 git diff-files --quiet >cnt &&
+	test_line_count = 0 cnt
 '
+
 test_expect_success 'git diff-index --cached HEAD' '
-	git update-index c && {
-		git diff-index --quiet --cached HEAD >cnt
-		test $? = 1 && test_line_count = 0 cnt
-	}
+	git update-index c &&
+	test_expect_code 1 git diff-index --quiet --cached HEAD >cnt &&
+	test_line_count = 0 cnt
 '
 
 test_expect_success 'git diff, one file outside repo' '

t/t4053-diff-no-index.sh

@@ -17,8 +17,8 @@ test_expect_success 'setup' '
 '
 
 test_expect_success 'git diff --no-index directories' '
-	git diff --no-index a b >cnt
-	test $? = 1 && test_line_count = 14 cnt
+	test_expect_code 1 git diff --no-index a b >cnt &&
+	test_line_count = 14 cnt
 '
 
 test_expect_success 'git diff --no-index relative path outside repo' '