API: output for autoupdate

This commit provides a minimal output to be displayed when the --quiet
flag is used for this command:
- swupd autoupdate

Signed-off-by: Castulo Martinez <castulo.martinez@intel.com>

test/functional/api/api-autoupdate.bats

@@ -0,0 +1,51 @@
+#!/usr/bin/env bats
+
+# Author: Castulo Martinez
+# Email: castulo.martinez@intel.com
+
+load "../testlib"
+
+test_setup() {
+
+	create_test_environment "$TEST_NAME"
+	sudo mkdir -p "$PATH_PREFIX"/etc/systemd/system
+
+}
+
+@test "API004: autoupdate" {
+
+	run sudo sh -c "$SWUPD autoupdate $SWUPD_OPTS --quiet"
+
+	assert_status_is "$SWUPD_NO"
+	assert_output_is_empty
+
+}
+
+@test "API005: autoupdate --enable" {
+
+	# create mask files manually
+	sudo ln -s /dev/null "$PATH_PREFIX"/etc/systemd/system/swupd-update.service
+	sudo ln -s /dev/null "$PATH_PREFIX"/etc/systemd/system/swupd-update.timer
+
+	run sudo sh -c "$SWUPD autoupdate $SWUPD_OPTS --enable --quiet"
+
+	assert_status_is "$SWUPD_OK"
+	assert_output_is_empty
+	# check mask files don't exist
+	assert_file_not_exists "$PATH_PREFIX"/etc/systemd/system/swupd-update.service
+	assert_file_not_exists "$PATH_PREFIX"/etc/systemd/system/swupd-update.timer
+
+}
+
+@test "API006: autoupdate --disable" {
+
+	run sudo sh -c "$SWUPD autoupdate $SWUPD_OPTS --disable --quiet"
+
+	assert_status_is "$SWUPD_OK"
+	assert_output_is_empty
+	# check mask files don't exist
+	assert_symlink_exists "$PATH_PREFIX"/etc/systemd/system/swupd-update.service
+	assert_symlink_exists "$PATH_PREFIX"/etc/systemd/system/swupd-update.timer
+
+}
+

test/functional/testlib.bash

@@ -4601,6 +4601,15 @@ assert_regex_is_not_output() { # assertion
 
 }
 
+assert_output_is_empty() { # assertion
+
+	if [ -n "$output" ]; then
+		print_assert_failure "The output was expected to be empty and it is not"
+		return 1
+	fi
+
+}
+
 assert_equal() { # assertion
 
 	local val1=$1