[PATCH 1 of 2 V2] run-tests: added '--json' functionality to store timing data in json file

[Anurag Goel]

# HG changeset patch
# User anuraggoel <anurag.dsps at gmail.com>
# Date 1403430215 -19800
#      Sun Jun 22 15:13:35 2014 +0530
# Node ID bdb3d7c108ba9a5ba38e1b3282dd18115ba6eed9
# Parent  f6e0718c2101207ba62ceccc7ca916f4e7d83b1d
run-tests: added '--json' functionality to store timing data in json file

This patch added a new functionality '--json'. While testing, if '--json'
is enabled then timing data gets stored in newly created "report.json" file,
in the following format.
testreport ={
    "test-xyz.t": 6.181909084320068
}

This "report.json" file will further accessed by html/javascript file to
plot graph between testname Vs testime.

diff -r f6e0718c2101 -r bdb3d7c108ba tests/run-tests.py
--- a/tests/run-tests.py	Sun Jun 22 01:35:29 2014 +0530
+++ b/tests/run-tests.py	Sun Jun 22 15:13:35 2014 +0530
@@ -58,6 +58,7 @@
 import killdaemons as killmod
 import Queue as queue
 import unittest
+import json
 
 processlock = threading.Lock()
 
@@ -185,6 +186,8 @@
              " (default: $%s or %d)" % defaults['timeout'])
     parser.add_option("--time", action="store_true",
         help="time how long each test takes")
+    parser.add_option("--json", action="store_true",
+        help="store timing data in 'report.json' file")
     parser.add_option("--tmpdir", type="string",
         help="run tests in the given temporary directory"
              " (implies --keep-tmpdir)")
@@ -1341,9 +1344,19 @@
                 os.environ['PYTHONHASHSEED'])
         if self._runner.options.time:
             self.printtimes(result.times)
+        if self._runner.options.json:
+            self.getjsonfile(result.times)
 
         return result
 
+    def getjsonfile(self, times):
+        """Store timing data in json format in report.json file. """
+
+        fp = open("report.json", "w")
+        timedata = dict(times)
+        fp.writelines(("testreport =", (json.dumps(timedata, indent=2))))
+        fp.close()
+
     def printtimes(self, times):
         self.stream.writeln('# Producing time report')
         times.sort(key=lambda t: (t[1], t[0]), reverse=True)