helpers: Add value_in_range helper

This helper is useful to check if a value is within a given range e.g.
temperature is between 30 and 40 degrees.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>

Makefile

@@ -12,6 +12,7 @@ HELPERS := assert_device_present \
 	   ensure_lib_firmware \
 	   rproc-start \
 	   rproc-stop \
+	   value_in_range \
 	   state_check
 
 BOARDS := arrow,apq8096-db820c \

helpers/value_in_range

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+. bootrr
+
+TEST_CASE_ID="$1"
+LOC="$2"
+LOW="$3"
+HIGH="$4"
+
+if [ -z "${TEST_CASE_ID}" -o -z "${LOC}" -o -z "${LOW}" -o -z "${HIGH}" ]; then
+	echo "Usage: $0 <test-case-id> <path> <low> <high> [<timeout>]"
+	exit 1
+fi
+
+[ -r "${LOC}" ] || test_report_exit fail
+
+val=$(cat "${LOC}")
+if [ "${val}" -ge "${LOW}" -a "${val}" -le "${HIGH}" ]; then
+	test_report_exit pass
+else
+	test_report_exit fail
+fi