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/runtest.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+
+set -eu
+
+texec() {
+    ./testenv_exec.sh $(pgrep -P $finit_ppid) "$@"
+}
+
+fg_red='31'
+fg_green='32'
+fg_yellow='33'
+log() {
+    printf "< TEST > \e[1;%dm%s\e[0m %s\n" "$1" "$2" "$3"
+}
+
+assert() {
+    msg=$1
+    shift
+    if [ ! "$@" ]; then
+        log "$fg_red" ✘ "$msg"
+        exit 1
+    fi
+    log "$fg_green" ✔ "$msg"
+}
+
+say() {
+    log "$fg_yellow" ● "$@"
+}
+
+teardown() {
+    texec kill 1
+
+    wait
+}
+
+trap teardown EXIT
+
+# Setup
+./testenv_start.sh finit &
+finit_ppid=$!
+for i in $(seq 1 50); do
+    sleep 0.1
+    finit_pid=$(pgrep -P "$finit_ppid") || continue
+    break
+done
+
+texec cat /dev/tty0 &
+sleep 1
+
+TEST_DIR=$(dirname $1)
+
+source "$1"