[RFC/PATCH 7/7] test-lib: generate JUnit output via TAP

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Rewrite the home-brew JUnit output generation added in
22231908151 (tests: optionally write results as JUnit-style .xml,
2019-01-29) and other subsequent commits to be generated via the TAP
output.

This is now possible that the TAP output emitted with --tee is
guaranteed to be valid TAP, see the preceding commit.

The JUnit output is not bug-for-bug compatible with the previous
output, but it looks better to me.

This also requires installing TAP::Formatter::JUnit[1], perhaps that's
not palatable to the users of the --write-junit-xml option.

In any case, it'll be easy to whip up our own TAP emitter with a
TAP::Parser and TAP::Formatter, both of whom come with perl itself,
which we already rely on for tests.

It should also be significantly faster on Windows, as we can
e.g. write all the *.out files, and only do that conversion at the end
for all files in a batch, as opposed to the current implementation of
shelling out to test-tool in a loop for each test.

1. https://metacpan.org/pod/distribution/TAP-Formatter-JUnit/script/tap2junit

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 Makefile                   |   1 -
 t/helper/test-date.c       |  12 ----
 t/helper/test-path-utils.c |  21 -------
 t/helper/test-tool.c       |   1 -
 t/helper/test-tool.h       |   1 -
 t/helper/test-xml-encode.c |  80 ------------------------
 t/test-lib.sh              | 123 ++++---------------------------------
 7 files changed, 12 insertions(+), 227 deletions(-)
 delete mode 100644 t/helper/test-xml-encode.c

diff --git a/Makefile b/Makefile
index d26b9d62ee9..fa7c52f7a42 100644
--- a/Makefile
+++ b/Makefile
@@ -748,7 +748,6 @@ TEST_BUILTINS_OBJS += test-urlmatch-normalization.o
 TEST_BUILTINS_OBJS += test-wildmatch.o
 TEST_BUILTINS_OBJS += test-windows-named-pipe.o
 TEST_BUILTINS_OBJS += test-write-cache.o
-TEST_BUILTINS_OBJS += test-xml-encode.o
 
 # Do not add more tests here unless they have extra dependencies. Add
 # them in TEST_BUILTINS_OBJS above.
diff --git a/t/helper/test-date.c b/t/helper/test-date.c
index 099eff4f0fc..ebf133943b3 100644
--- a/t/helper/test-date.c
+++ b/t/helper/test-date.c
@@ -8,7 +8,6 @@ static const char *usage_msg = "\n"
 "  test-tool date parse [date]...\n"
 "  test-tool date approxidate [date]...\n"
 "  test-tool date timestamp [date]...\n"
-"  test-tool date getnanos [start-nanos]\n"
 "  test-tool date is64bit\n"
 "  test-tool date time_t-is64bit\n";
 
@@ -92,15 +91,6 @@ static void parse_approx_timestamp(const char **argv)
 	}
 }
 
-static void getnanos(const char **argv)
-{
-	double seconds = getnanotime() / 1.0e9;
-
-	if (*argv)
-		seconds -= strtod(*argv, NULL);
-	printf("%lf\n", seconds);
-}
-
 int cmd__date(int argc, const char **argv)
 {
 	const char *x;
@@ -120,8 +110,6 @@ int cmd__date(int argc, const char **argv)
 		parse_approxidate(argv+1);
 	else if (!strcmp(*argv, "timestamp"))
 		parse_approx_timestamp(argv+1);
-	else if (!strcmp(*argv, "getnanos"))
-		getnanos(argv+1);
 	else if (!strcmp(*argv, "is64bit"))
 		return sizeof(timestamp_t) == 8 ? 0 : 1;
 	else if (!strcmp(*argv, "time_t-is64bit"))
diff --git a/t/helper/test-path-utils.c b/t/helper/test-path-utils.c
index 313a153209c..090596ac492 100644
--- a/t/helper/test-path-utils.c
+++ b/t/helper/test-path-utils.c
@@ -407,27 +407,6 @@ int cmd__path_utils(int argc, const char **argv)
 		return !!res;
 	}
 
-	if (argc == 4 && !strcmp(argv[1], "skip-n-bytes")) {
-		int fd = open(argv[2], O_RDONLY), offset = atoi(argv[3]);
-		char buffer[65536];
-
-		if (fd < 0)
-			die_errno("could not open '%s'", argv[2]);
-		if (lseek(fd, offset, SEEK_SET) < 0)
-			die_errno("could not skip %d bytes", offset);
-		for (;;) {
-			ssize_t count = read(fd, buffer, sizeof(buffer));
-			if (count < 0)
-				die_errno("could not read '%s'", argv[2]);
-			if (!count)
-				break;
-			if (write(1, buffer, count) < 0)
-				die_errno("could not write to stdout");
-		}
-		close(fd);
-		return 0;
-	}
-
 	if (argc > 5 && !strcmp(argv[1], "slice-tests")) {
 		int res = 0;
 		long offset, stride, i;
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 1876bad8f42..3fa02011b61 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -73,7 +73,6 @@ static struct test_cmd cmds[] = {
 	{ "tee", cmd__tee },
 	{ "trace2", cmd__trace2 },
 	{ "urlmatch-normalization", cmd__urlmatch_normalization },
-	{ "xml-encode", cmd__xml_encode },
 	{ "wildmatch", cmd__wildmatch },
 #ifdef GIT_WINDOWS_NATIVE
 	{ "windows-named-pipe", cmd__windows_named_pipe },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index 9b3c1f75267..5028730807e 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -63,7 +63,6 @@ int cmd__subprocess(int argc, const char **argv);
 int cmd__tee(int argc, const char **argv);
 int cmd__trace2(int argc, const char **argv);
 int cmd__urlmatch_normalization(int argc, const char **argv);
-int cmd__xml_encode(int argc, const char **argv);
 int cmd__wildmatch(int argc, const char **argv);
 #ifdef GIT_WINDOWS_NATIVE
 int cmd__windows_named_pipe(int argc, const char **argv);
diff --git a/t/helper/test-xml-encode.c b/t/helper/test-xml-encode.c
deleted file mode 100644
index a648bbd961c..00000000000
--- a/t/helper/test-xml-encode.c
+++ /dev/null
@@ -1,80 +0,0 @@
-#include "test-tool.h"
-
-static const char *utf8_replace_character = "&#xfffd;";
-
-/*
- * Encodes (possibly incorrect) UTF-8 on <stdin> to <stdout>, to be embedded
- * in an XML file.
- */
-int cmd__xml_encode(int argc, const char **argv)
-{
-	unsigned char buf[1024], tmp[4], *tmp2 = NULL;
-	ssize_t cur = 0, len = 1, remaining = 0;
-	unsigned char ch;
-
-	for (;;) {
-		if (++cur == len) {
-			len = xread(0, buf, sizeof(buf));
-			if (!len)
-				return 0;
-			if (len < 0)
-				die_errno("Could not read <stdin>");
-			cur = 0;
-		}
-		ch = buf[cur];
-
-		if (tmp2) {
-			if ((ch & 0xc0) != 0x80) {
-				fputs(utf8_replace_character, stdout);
-				tmp2 = NULL;
-				cur--;
-				continue;
-			}
-			*tmp2 = ch;
-			tmp2++;
-			if (--remaining == 0) {
-				fwrite(tmp, tmp2 - tmp, 1, stdout);
-				tmp2 = NULL;
-			}
-			continue;
-		}
-
-		if (!(ch & 0x80)) {
-			/* 0xxxxxxx */
-			if (ch == '&')
-				fputs("&amp;", stdout);
-			else if (ch == '\'')
-				fputs("&apos;", stdout);
-			else if (ch == '"')
-				fputs("&quot;", stdout);
-			else if (ch == '<')
-				fputs("&lt;", stdout);
-			else if (ch == '>')
-				fputs("&gt;", stdout);
-			else if (ch >= 0x20)
-				fputc(ch, stdout);
-			else if (ch == 0x09 || ch == 0x0a || ch == 0x0d)
-				fprintf(stdout, "&#x%02x;", ch);
-			else
-				fputs(utf8_replace_character, stdout);
-		} else if ((ch & 0xe0) == 0xc0) {
-			/* 110XXXXx 10xxxxxx */
-			tmp[0] = ch;
-			remaining = 1;
-			tmp2 = tmp + 1;
-		} else if ((ch & 0xf0) == 0xe0) {
-			/* 1110XXXX 10Xxxxxx 10xxxxxx */
-			tmp[0] = ch;
-			remaining = 2;
-			tmp2 = tmp + 1;
-		} else if ((ch & 0xf8) == 0xf0) {
-			/* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
-			tmp[0] = ch;
-			remaining = 3;
-			tmp2 = tmp + 1;
-		} else
-			fputs(utf8_replace_character, stdout);
-	}
-
-	return 0;
-}
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 0070d05234b..4dc41eeccc2 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -371,6 +371,17 @@ then
 		--escape-stdout ${HARNESS_ACTIVE+--escape-file} \
 		"$GIT_TEST_TEE_OUTPUT_FILE"
 	test "$(cat "$TEST_RESULTS_BASE.exit")" = 0
+	if test -n "$write_junit_xml"
+	then
+		junit_xml_dir="$TEST_OUTPUT_DIRECTORY/out"
+		mkdir -p "$junit_xml_dir"
+		junit_xml_base=${0##*/}
+		junit_xml_path="$junit_xml_dir/TEST-${junit_xml_base%.sh}.xml"
+		junit_attrs="timestamp=\"$(TZ=UTC date +%Y-%m-%dT%H:%M:%S)\""
+		tap2junit --name="$TEST_NAME" - \
+			<"$GIT_TEST_TEE_OUTPUT_FILE" \
+			>"$junit_xml_path"
+	fi
 	exit
 elif test -n "$verbose" -a -n "$HARNESS_ACTIVE"
 then
@@ -588,7 +599,6 @@ export TERM
 
 error () {
 	say_color error "error: $*"
-	finalize_junit_xml
 	GIT_EXIT_OK=t
 	exit 1
 }
@@ -672,56 +682,24 @@ trap '{ code=$?; set +x; } 2>/dev/null; exit $code' INT TERM HUP
 # the test_expect_* functions instead.
 
 test_ok_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$*"
-	fi
 	test_success=$(($test_success + 1))
 	say_color_tap "${verbose:+pass}" "ok $test_count - $@"
 }
 
 test_failure_ () {
-	if test -n "$write_junit_xml"
-	then
-		junit_insert="<failure message=\"not ok $test_count -"
-		junit_insert="$junit_insert $(xml_attr_encode "$1")\">"
-		junit_insert="$junit_insert $(xml_attr_encode \
-			"$(if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-			   then
-				test-tool path-utils skip-n-bytes \
-					"$GIT_TEST_TEE_OUTPUT_FILE" $GIT_TEST_TEE_OFFSET
-			   else
-				printf '%s\n' "$@" | sed 1d
-			   fi)")"
-		junit_insert="$junit_insert</failure>"
-		if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-		then
-			junit_insert="$junit_insert<system-err>$(xml_attr_encode \
-				"$(cat "$GIT_TEST_TEE_OUTPUT_FILE")")</system-err>"
-		fi
-		write_junit_xml_testcase "$1" "      $junit_insert"
-	fi
 	test_failure=$(($test_failure + 1))
 	say_color_tap error "not ok $test_count - $1"
 	shift
 	printf '%s\n' "$*" | sed -e 's/^/#	/'
-	test "$immediate" = "" || { finalize_junit_xml; GIT_EXIT_OK=t; exit 1; }
+	test "$immediate" = "" || { GIT_EXIT_OK=t; exit 1; }
 }
 
 test_known_broken_ok_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$* (breakage fixed)"
-	fi
 	test_fixed=$(($test_fixed+1))
 	say_color error "ok $test_count - $@ # TODO known breakage vanished"
 }
 
 test_known_broken_failure_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$* (known breakage)"
-	fi
 	test_broken=$(($test_broken+1))
 	say_color_tap warn "not ok $test_count - $@ # TODO known breakage"
 }
@@ -983,10 +961,6 @@ test_start_ () {
 	test_count=$(($test_count+1))
 	maybe_setup_verbose
 	maybe_setup_valgrind
-	if test -n "$write_junit_xml"
-	then
-		junit_start=$(test-tool date getnanos)
-	fi
 }
 
 test_finish_ () {
@@ -1029,13 +1003,6 @@ test_skip () {
 
 	case "$to_skip" in
 	t)
-		if test -n "$write_junit_xml"
-		then
-			message="$(xml_attr_encode "$skipped_reason")"
-			write_junit_xml_testcase "$1" \
-				"      <skipped message=\"$message\" />"
-		fi
-
 		say_color_tap skip "ok $test_count # skip $1 ($skipped_reason)"
 		: true
 		;;
@@ -1050,53 +1017,6 @@ test_at_end_hook_ () {
 	:
 }
 
-write_junit_xml () {
-	case "$1" in
-	--truncate)
-		>"$junit_xml_path"
-		junit_have_testcase=
-		shift
-		;;
-	esac
-	printf '%s\n' "$@" >>"$junit_xml_path"
-}
-
-xml_attr_encode () {
-	printf '%s\n' "$@" | test-tool xml-encode
-}
-
-write_junit_xml_testcase () {
-	junit_attrs="name=\"$(xml_attr_encode "$this_test.$test_count $1")\""
-	shift
-	junit_attrs="$junit_attrs classname=\"$this_test\""
-	junit_attrs="$junit_attrs time=\"$(test-tool \
-		date getnanos $junit_start)\""
-	write_junit_xml "$(printf '%s\n' \
-		"    <testcase $junit_attrs>" "$@" "    </testcase>")"
-	junit_have_testcase=t
-}
-
-finalize_junit_xml () {
-	if test -n "$write_junit_xml" && test -n "$junit_xml_path"
-	then
-		test -n "$junit_have_testcase" || {
-			junit_start=$(test-tool date getnanos)
-			write_junit_xml_testcase "all tests skipped"
-		}
-
-		# adjust the overall time
-		junit_time=$(test-tool date getnanos $junit_suite_start)
-		sed -e "s/\(<testsuite.*\) time=\"[^\"]*\"/\1/" \
-			-e "s/<testsuite [^>]*/& time=\"$junit_time\"/" \
-			-e '/^ *<\/testsuite/d' \
-			<"$junit_xml_path" >"$junit_xml_path.new"
-		mv "$junit_xml_path.new" "$junit_xml_path"
-
-		write_junit_xml "  </testsuite>" "</testsuites>"
-		write_junit_xml=
-	fi
-}
-
 test_atexit_cleanup=:
 test_atexit_handler () {
 	# In a succeeding test script 'test_atexit_handler' is invoked
@@ -1119,8 +1039,6 @@ test_done () {
 	# removed, so the commands can access pidfiles and socket files.
 	test_atexit_handler
 
-	finalize_junit_xml
-
 	if test -z "$HARNESS_ACTIVE"
 	then
 		mkdir -p "$TEST_RESULTS_DIR"
@@ -1364,23 +1282,6 @@ then
 	test_done
 fi
 
-if test -n "$write_junit_xml"
-then
-	junit_xml_dir="$TEST_OUTPUT_DIRECTORY/out"
-	mkdir -p "$junit_xml_dir"
-	junit_xml_base=${0##*/}
-	junit_xml_path="$junit_xml_dir/TEST-${junit_xml_base%.sh}.xml"
-	junit_attrs="name=\"${junit_xml_base%.sh}\""
-	junit_attrs="$junit_attrs timestamp=\"$(TZ=UTC \
-		date +%Y-%m-%dT%H:%M:%S)\""
-	write_junit_xml --truncate "<testsuites>" "  <testsuite $junit_attrs>"
-	junit_suite_start=$(test-tool date getnanos)
-	if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-	then
-		GIT_TEST_TEE_OFFSET=0
-	fi
-fi
-
 # Convenience
 # A regexp to match 5, 35 and 40 hexdigits
 _x05='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
-- 
2.31.0.rc1.210.g0f8085a843c




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