[benchmark] Fix parsing formatted text

The test number column in the space justified column format emmited by the Benchmark_Driver to stdout  while logging to file is right aligned, so it must handle leading whitespace.

Author: palimondo

benchmark/scripts/compare_perf_tests.py

@@ -308,7 +308,7 @@ def _reset(self):
 
     # Parse lines like this
     # #,TEST,SAMPLES,MIN(μs),MAX(μs),MEAN(μs),SD(μs),MEDIAN(μs)
-    results_re = re.compile(r'(\d+[, \t]*\w+[, \t]*' +
+    results_re = re.compile(r'([ ]*\d+[, \t]*\w+[, \t]*' +
                             r'[, \t]*'.join([r'[\d.]+'] * 6) +
                             r'[, \t]*[\d.]*)')  # optional MAX_RSS(B)
 

benchmark/scripts/test_compare_perf_tests.py

@@ -345,9 +345,9 @@ def test_parse_results_tab_delimited(self):
     def test_parse_results_formatted_text(self):
         """Parse format that Benchmark_Driver prints to console"""
         log = ("""
-# TEST      SAMPLES MIN(μs) MAX(μs) MEAN(μs) SD(μs) MEDIAN(μs) MAX_RSS(B)
-3 Array2D        20    2060    2188     2099      0       2099   20915200
-Totals        281""")
+  # TEST      SAMPLES MIN(μs) MAX(μs) MEAN(μs) SD(μs) MEDIAN(μs) MAX_RSS(B)
+  3 Array2D        20    2060    2188     2099      0       2099   20915200
+    Totals        281""")
         parser = LogParser()
         results = parser.parse_results(log.splitlines()[1:])  # without 1st \n
         self.assertTrue(isinstance(results[0], PerformanceTestResult))