Add a script to detect changes in test files (#8020)

* add script to detect changes in test files

* remove build failure test

bin/utils/detect_test_file_changes.rb

@@ -0,0 +1,57 @@
+#!/usr/bin/env ruby
+# ruby script to detect changes in test-related files
+require 'yaml'
+require 'digest'
+
+hash   = Digest::SHA256.hexdigest("xyz")
+
+filename= ARGV[0]
+
+if !filename
+  puts "Usage: #{$0} filename"
+  exit 1
+end
+
+if !File.file? filename
+  warn "Error. #{filename} doesn't exist." 
+  exit 1
+end
+
+mismatch = 0
+count = 0
+
+test_files = YAML.load_file(filename)
+test_files.each do |test_file|
+  count = count + 1
+  # file still exists?
+  if !File.file? test_file['filename']
+    warn "Error. Provided test file `#{test_file['filename']}` doesn't exist."
+    mismatch = mismatch + 1
+  end
+
+  # check sha256 hash
+  sha256 = Digest::SHA256.hexdigest(File.read(test_file['filename']))
+  if test_file['sha256'] != sha256
+    warn "Looks like #{test_file['filename']} has been modified as its SHA256 `#{sha256}` is not the same as the one in the record: #{test_file['sha256']}"
+    mismatch = mismatch + 1
+  else
+    # no change to the test file
+  end
+end
+
+if mismatch > 0
+  warn "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+  warn "There are #{mismatch} mismatch. Please review the test files to ensure it has not been deleted/regenerated."
+  warn "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+  exit 1
+else
+  puts "OK. All matched!"
+end
+
+if count == 0
+  warn "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+  warn "Looks like the test file list in #{filename} is empty! Please check!"
+  warn "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
+  exit 1
+end
+