test: new test, verify env:file variable expansion

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/svc-env.sh

@@ -0,0 +1,34 @@
+#!/bin/sh
+# Ensure service environment variables are sourced and expanded properly.
+set -e
+
+TEST_DIR=$(dirname "$0")
+
+test_setup()
+{
+    say "Test start $(date)"
+}
+
+test_teardown()
+{
+    say "Test done $(date)"
+
+    say "Running test teardown."
+    run "rm -f $FINIT_CONF"
+}
+
+# shellcheck source=/dev/null
+. "$TEST_DIR/lib/setup.sh"
+
+sep "/etc/env:"
+run "cat /etc/env"
+run "echo 'service env:/etc/env serv -np -e xyzzy:bar -- serv checks xyzzy=bar' > $FINIT_CONF"
+
+say 'Reload Finit'
+run "initctl reload"
+
+retry 'assert_num_children 1 serv'
+
+say "Done, drop service from $FINIT_CONF ..."
+run "rm $FINIT_CONF"
+run "initctl reload"