test/battery: add multiple-battery edge case

test/plugins/battery.plugin.bats

@@ -193,11 +193,19 @@ function setup_acpi {
 # Creates a `upower` function that simulates output like the real `upower` command.
 # The passed in parameter is used for the remaining battery percentage.
 function setup_upower {
-  percent="$1"
+	percent="$1"
 
-  function upower {
-    printf "voltage:             12.191 V\n    time to full:        57.3 minutes\n    percentage:          %s\n    capacity:            84.6964" "${percent}"
-  }
+	function upower {
+		case $1 in
+		'-e'|'--enumerate')
+			echo "/org/freedesktop/UPower/devices/battery_BAT0"
+			echo "/org/freedesktop/UPower/devices/mouse_hid_${RANDOM}_battery"
+			;;
+		'-i'|'--show-info')
+			printf "voltage:             12.191 V\n    time to full:        57.3 minutes\n    percentage:          %s\n    capacity:            84.6964" "${percent}"
+			;;
+		esac
+	}
 }
 
 @test 'plugins battery: battery-percentage with upower, 100%' {