XMLHTTPRequest Mutator - Initial step Mutation testing

python/servo/mutation/test.py

@@ -0,0 +1,35 @@
+import fileinput
+import re
+import subprocess
+import sys
+
+def mutate_line(file_name, line_number):
+    lines = open(file_name, 'r').readlines()
+    lines[line_number - 1] = re.sub(r'\s&&\s', ' || ', lines[line_number - 1])
+    out = open(file_name, 'w')
+    out.writelines(lines)
+    out.close()
+
+def mutation_test(file_name):
+    lineNumbers = []
+    for line in fileinput.input(file_name):
+        if re.search(r'\s&&\s', line):
+            lineNumbers.append(fileinput.lineno())
+
+    for lineToMutate in lineNumbers:
+        print "Mutating {0} at line {1}".format(file_name, lineToMutate)
+        mutate_line(file_name, lineToMutate)
+        print "compling mutant {0}-{1}".format(file_name, lineToMutate)
+        sys.stdout.flush()
+        subprocess.call('python mach build --release', shell=True)
+        print "running tests for mutant {0}-{1}".format(file_name, lineToMutate)
+        sys.stdout.flush()
+        subprocess.call('python mach test-wpt XMLHttpRequest --release', shell=True)
+        print "mutated file {0} diff".format(file_name)
+        sys.stdout.flush()
+        subprocess.call('git --no-pager diff {0}'.format(file_name), shell=True)
+        print "reverting mutant {0}-{1}".format(file_name, lineToMutate)
+        sys.stdout.flush()
+        subprocess.call('git checkout {0}'.format(file_name), shell=True)
+
+mutation_test('components/script/dom/xmlhttprequest.rs')