From c4101334e1a88e1f63c38982b49fba221ff4ab31 Mon Sep 17 00:00:00 2001
From: Stefano Brivio <sbrivio@redhat.com>
Date: Thu, 6 Oct 2022 17:19:12 +0200
Subject: test: Add rudimentary support to run selected tests only

To keep this simple, only support tests that have corresponding setup
and teardown functions implied by their path. For example:

  ./run passt/ndp

will trigger the 'passt' setup and teardown functions.

This is not really elegant, but it looks robust, and while David is
considering proper alternatives, it should be quite useful.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
---
 test/README.md | 16 ++++++++++++++++
 test/lib/term  |  2 +-
 test/run       | 37 ++++++++++++++++++++++++++++++++++++-
 3 files changed, 53 insertions(+), 2 deletions(-)

diff --git a/test/README.md b/test/README.md
index 72a4986..09ad05d 100644
--- a/test/README.md
+++ b/test/README.md
@@ -85,6 +85,22 @@ variable settings: DEBUG=1 enables debugging messages, TRACE=1 enables tracing
 
     PCAP=1 TRACE=1 ./run
 
+## Running selected tests
+
+Rudimentary support to run a list of selected tests, without support for
+dependencies, is available. Tests need to have a setup function corresponding to
+their path. For example:
+
+    ./run passt/ndp passt/dhcp pasta/ndp
+
+will call the 'passt' setup function (from lib/setup), run the two corresponding
+tests, call the 'passt' teardown function, the 'pasta' setup, run the pasta/ndp
+test, and finally tear down the 'pasta' setup.
+
+Note that requirements on steps implemented by related tests are not handled.
+For example, if the 'passt/tcp' needs guest connectivity set up by the
+'passt/ndp' and 'passt/dhcp' tests, those need to be listed explicitly.
+
 ## Continuous integration
 
 Issuing:
diff --git a/test/lib/term b/test/lib/term
index eade2cd..1b42df8 100755
--- a/test/lib/term
+++ b/test/lib/term
@@ -650,7 +650,7 @@ run_term() {
 		asciinema rec --overwrite "${STATEBASE}/demo.uncut" -c "$TMUX /bin/sh -c './run_demo from_term'"
 		video_postprocess "${STATEBASE}/demo.uncut"
 	else
-		$TMUX /bin/sh -c './run from_term'
+		$TMUX /bin/sh -c "./run from_term ${*}"
 	fi
 }
 
diff --git a/test/run b/test/run
index 4bb9cd8..1ae270e 100755
--- a/test/run
+++ b/test/run
@@ -127,6 +127,37 @@ run() {
 	return 0
 }
 
+# run_selected() - Run list of tests, with setup/teardown based on test path
+# $@:	List of tests
+run_selected() {
+	mkfifo $STATEBASE/log_pipe
+
+	term
+	VALGRIND=1
+
+	__setup=
+	for __test; do
+		if [ "${__test%%/*}" != "${__setup}" ]; then
+			[ -n "${__setup}" ] && teardown "${__setup}"
+			__setup="${__test%%/*}"
+			setup "${__setup}"
+		fi
+
+		test "${__test}"
+	done
+	teardown "${__setup}"
+
+	log "PASS: ${STATUS_PASS}, FAIL: ${STATUS_FAIL}"
+
+	pause_continue \
+		"Press any key to keep test session open"	\
+		"Closing in "					\
+		"Interrupted, press any key to quit"		\
+		9
+
+	return 0
+}
+
 # demo() - Simpler path for demo purposes
 demo() {
 	mkfifo $STATEBASE/log_pipe
@@ -160,11 +191,15 @@ demo() {
 [ "$(basename "${0}")" = "run_demo" ] && DEMO=1
 
 if [ "${1}" = "from_term" ]; then
+	shift
+
 	exec > ${LOGDIR}/script.log 2>&1
 	[ ${DEBUG} -eq 1 ] && set -x
 	cd ..
 	if [ ${DEMO} -eq 1 ]; then
 		demo
+	elif [ -n "${1}" ]; then
+		run_selected ${*}
 	else
 		run
 	fi
@@ -176,7 +211,7 @@ else
 	:> "${LOGFILE}"
 	STATEBASE="$(mktemp -d --tmpdir passt-tests-XXXXXX)"
 	trap "cleanup" EXIT
-	run_term
+	run_term ${*}
 fi
 
 [ ${DEMO} -eq 1 ] && exit 0
-- 
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