test: New test: test_start_stop_service

Add a new test that verifies that Finit will:
- Start a service that's been added to the config
- Stop the service once it's removed from the config

The second step is currently failing.

Signed-off-by: Jacques de Laval <jacques@de-laval.se>

test/test_start_stop_service/service.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -eu
+
+while [ 1 ]; do
+  sleep 5
+done

test/test_start_stop_service/test.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+set -eu
+
+# Test
+say 'Set up a service'
+cp "$TEST_DIR"/service.sh test_root/bin
+texec sh -c 'echo "service [2345] kill:20 log /bin/service.sh" > /etc/finit.conf'
+
+say 'Reload Finit'
+texec kill -SIGHUP 1
+sleep 1
+
+service_pids=( $(texec pgrep -P 1) )
+assert 'One service is running' ${#service_pids[@]} -eq 1
+
+say 'Remove the service'
+texec sh -c 'echo > /etc/finit.conf'
+
+say 'Reload Finit'
+texec kill -SIGHUP 1
+sleep 1
+
+service_pids=( $(texec pgrep -P 1) )
+assert 'Zero services are running' ${#service_pids[@]} -eq 0
+
+# Teardown
+rm -f test_root/bin/service.sh