Porting relevant legacy conversion code from performance_lp to src side

tools/perf/generate_legacy_perf_dashboard_json_unittest.py

Index: tools/perf/generate_legacy_perf_dashboard_json_unittest.py
diff --git a/tools/perf/generate_legacy_perf_dashboard_json_unittest.py b/tools/perf/generate_legacy_perf_dashboard_json_unittest.py
new file mode 100755
index 0000000000000000000000000000000000000000..daf47161f6bc8ca0b30164b9ed196ebee392b17c
--- /dev/null
+++ b/tools/perf/generate_legacy_perf_dashboard_json_unittest.py
@@ -0,0 +1,104 @@
+#!/usr/bin/env python
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+
+"""Unit tests for generating legacy perf dashboard json used by

[eakuefner, 2016/11/04 16:58:56]

I think that it is clear what this file does from the filename, no comment
necessary.

[eyaich1, 2016/11/04 17:33:03]

Done.

+run_test_perf_test.py."""
+
+import json
+import os
+import unittest
+
+import generate_legacy_perf_dashboard_json
+
+class LegacyResultsProcessorUnittest(unittest.TestCase):
+  def setUp(self):
+    """Set up for all test method of each test method below."""
+    super(LegacyResultsProcessorUnittest, self).setUp()
+    self.data_directory = os.path.join(os.path.dirname(
+      os.path.abspath(__file__)), 'testdata')
+
+  def _ConstructDefaultProcessor(self):
+    """Creates a LegacyResultsProcessor instance.
+
+    Returns:
+      An instance of LegacyResultsProcessor class
+    """
+    return generate_legacy_perf_dashboard_json.LegacyResultsProcessor()
+
+  def _ProcessLog(self, log_processor, logfile):  # pylint: disable=R0201
+    """Reads in a input log file and processes it.
+
+    This changes the state of the log processor object; the output is stored
+    in the object and can be gotten using the PerformanceLogs() method.
+
+    Args:
+      log_processor: An PerformanceLogProcessor instance.
+      logfile: File name of an input performance results log file.
+    """
+    for line in open(os.path.join(self.data_directory, logfile)):
+      log_processor._ProcessLine(line)
+
+  def _CheckFileExistsWithData(self, logs, graph):
+    """Asserts that |graph| exists in the |logs| dict and is non-empty."""
+    self.assertTrue(graph in logs, 'File %s was not output.' % graph)
+    self.assertTrue(logs[graph], 'File %s did not contain data.' % graph)
+
+  def _ConstructParseAndCheckLogfiles(self, inputfiles, graphs):
+    """Uses a log processor to process the given input files.
+
+    Args:
+      inputfiles: A list of input performance results log file names.
+      logfiles: List of expected output ".dat" file names.
+
+    Returns:
+      A dictionary mapping output file name to output file lines.
+    """
+    parser = self._ConstructDefaultProcessor()
+    for inputfile in inputfiles:
+      self._ProcessLog(parser, inputfile)
+
+    logs = json.loads(parser._GenerateGraphJson())
+    for graph in graphs:
+      self._CheckFileExistsWithData(logs, graph)
+
+    return logs
+
+  def _ConstructParseAndCheckJSON(
+      self, inputfiles, logfiles, graphs):
+    """Processes input with a log processor and checks against expectations.
+
+    Args:
+      inputfiles: A list of input performance result log file names.
+      logfiles: A list of expected output ".dat" file names.
+      subdir: Subdirectory containing expected output files.
+      log_processor_class: A log processor class.
+    """
+    logs = self._ConstructParseAndCheckLogfiles(inputfiles, graphs)
+    index = 0
+    for filename in logfiles:
+      graph_name = graphs[index]
+      actual = logs[graph_name]
+      path = os.path.join(self.data_directory, filename)
+      expected = json.load(open(path))
+      self.assertEqual(expected, actual, 'JSON data in %s did not match '
+          'expectations.' % filename)
+
+      index += 1
+
+
+  def testSummary(self):
+    graphs = ['commit_charge',
+        'ws_final_total', 'vm_final_browser', 'vm_final_total',
+        'ws_final_browser', 'processes', 'artificial_graph']
+    # Tests the output of "summary" files, which contain per-graph data.
+    input_files = ['graphing_processor.log']
+    output_files = ['%s-summary.dat' % graph for graph in graphs]
+
+    self._ConstructParseAndCheckJSON(input_files, output_files, graphs)
+
+
+if __name__ == '__main__':
+  unittest.main()