Add script to test failure rate

test_failure_rate.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+#
+#
+repeat=$1
+cmd="${@:2}"
+
+if [[ -z "$repeat" || -z "$cmd" ]]; then
+	echo "Usage: test_error_rate.sh <repeat_count> command [ args ... ]"
+	echo "For example, to test uploading a binary to nodemcu board 200 times, run:"
+	echo "./test_failure_rate.sh 200 ./esptool -cp /dev/tty.SLAB_USBtoUART -cb 921600 -cd nodemcu -cf some_test_file.bin"
+	exit 1
+fi
+
+success=0
+fail=0
+
+for i in $(seq 1 $repeat); do
+	echo "Run $i"
+	if $cmd; then
+		success=$(($success+1))
+	else
+		fail=$(($fail+1))
+	fi
+done
+
+echo "Success: $success"
+echo "Fail: $fail"