Reland of V2 of //tools/binary_size rewrite (diffs).

tools/binary_size/integration_test.py

+#!/usr/bin/env python
+# Copyright 2017 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.
+
+import copy
+import difflib
+import itertools
+import logging
+import os
+import unittest
+import subprocess
+import sys
+import tempfile
+
+import describe
+import map2size
+import models
+
+
+_SCRIPT_DIR = os.path.dirname(__file__)
+_TEST_DATA_DIR = os.path.join(_SCRIPT_DIR, 'testdata')
+_TEST_MAP_PATH = os.path.join(_TEST_DATA_DIR, 'test.map')
+
+update_goldens = False
+
+
+def _AssertGolden(expected_lines, actual_lines):
+  expected = list(expected_lines)
+  actual = list(l + '\n' for l in actual_lines)
+  assert actual == expected, ('Did not match .golden.\n' +
+      ''.join(difflib.unified_diff(expected, actual, 'expected', 'actual')))
+
+
+def _CompareWithGolden(func):
+  name = func.__name__.replace('test_', '')
+  golden_path = os.path.join(_TEST_DATA_DIR, name + '.golden')
+
+  def inner(self):
+    actual_lines = func(self)
+
+    if update_goldens:
+      with open(golden_path, 'w') as file_obj:
+        describe.WriteLines(actual_lines, file_obj.write)
+      logging.info('Wrote %s', golden_path)
+    else:
+      with open(golden_path) as file_obj:
+        _AssertGolden(file_obj, actual_lines)
+  return inner
+
+
+def _RunApp(name, *args):
+  argv = [os.path.join(_SCRIPT_DIR, name), '--no-pypy']
+  argv.extend(args)
+  return subprocess.check_output(argv).splitlines()
+
+
+class IntegrationTest(unittest.TestCase):
+  size_info = None
+
+  def _GetParsedMap(self):
+    if not IntegrationTest.size_info:
+      IntegrationTest.size_info = map2size.Analyze(_TEST_MAP_PATH)
+    return copy.deepcopy(IntegrationTest.size_info)
+
+  @_CompareWithGolden
+  def test_Map2Size(self):
+    with tempfile.NamedTemporaryFile(suffix='.size') as temp_file:
+      _RunApp('map2size.py', _TEST_MAP_PATH, temp_file.name)
+      size_info = map2size.Analyze(temp_file.name)
+    sym_strs = (repr(sym) for sym in size_info.symbols)
+    stats = describe.DescribeSizeInfoCoverage(size_info)
+    return itertools.chain(stats, sym_strs)
+
+  @_CompareWithGolden
+  def test_ConsoleNullDiff(self):
+    return _RunApp('console.py', '--query', 'Diff(size_info1, size_info2)',
+                   _TEST_MAP_PATH, _TEST_MAP_PATH)
+
+  @_CompareWithGolden
+  def test_ActualDiff(self):
+    map1 = self._GetParsedMap()
+    map2 = self._GetParsedMap()
+    map1.symbols.symbols.pop(-1)
+    map2.symbols.symbols.pop(0)
+    map1.symbols[1].size -= 10
+    diff = models.Diff(map1, map2)
+    return describe.GenerateLines(diff)
+
+  def test_SymbolGroupMethods(self):
+    all_syms = self._GetParsedMap().symbols
+    global_syms = all_syms.WhereNameMatches('GLOBAL')
+    # Tests Filter(), Inverted(), and __sub__().
+    non_global_syms = global_syms.Inverted()
+    self.assertEqual(non_global_syms.symbols, (all_syms - global_syms).symbols)
+    # Tests Sorted() and __add__().
+    self.assertEqual(all_syms.Sorted().symbols,
+                     (global_syms + non_global_syms).Sorted().symbols)
+    # Tests GroupByPath() and __len__().
+    self.assertEqual(6, len(all_syms.GroupByPath()))
+
+
+def main():
+  argv = sys.argv
+  if len(argv) > 1 and argv[1] == '--update':
+    argv.pop(0)
+    global update_goldens
+    update_goldens = True
+
+  unittest.main(argv=argv, verbosity=2)
+
+
+if __name__ == '__main__':
+  main()