supersize: Add "diff" command

tools/binary_size/libsupersize/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 glob
 import itertools
 import logging
 import os
 import unittest
 import subprocess
 import sys
 import tempfile
 
 import archive
 import describe
@@ skipping 69 matching lines @@
     return itertools.chain(stats, sym_strs)
 
   def test_Archive_NoSourcePaths(self):
     # Just tests that it doesn't crash.
     with tempfile.NamedTemporaryFile(suffix='.size') as temp_file:
       _RunApp('archive', temp_file.name, '--no-source-paths',
               '--map-file', _TEST_MAP_PATH)
       archive.LoadAndPostProcessSizeInfo(temp_file.name)
 
   @_CompareWithGolden
-  def test_ConsoleNullDiff(self):
+  def test_Console(self):
+    with tempfile.NamedTemporaryFile(suffix='.size') as size_file, \
+         tempfile.NamedTemporaryFile(suffix='.txt') as output_file:
+      file_format.SaveSizeInfo(self._CloneSizeInfo(), size_file.name)
+      query = [
+          'ShowExamples()',
+          'ExpandRegex("_foo_")',
+          'Print(size_info, to_file=%r)' % output_file.name,
+      ]
+      ret = _RunApp('console', size_file.name, '--query', '; '.join(query))
+      with open(output_file.name) as f:
+        ret.extend(l.rstrip() for l in f)
+      return ret
+
+  @_CompareWithGolden
+  def test_Diff_NullDiff(self):
     with tempfile.NamedTemporaryFile(suffix='.size') as temp_file:
       file_format.SaveSizeInfo(self._CloneSizeInfo(), temp_file.name)
-      return _RunApp('console', '--query', 'Diff(size_info1, size_info2)',
-                     temp_file.name, temp_file.name)
+      return _RunApp('diff', temp_file.name, temp_file.name)
 
   @_CompareWithGolden
   def test_ActualDiff(self):
     size_info1 = self._CloneSizeInfo()
     size_info2 = self._CloneSizeInfo()
     size_info1.metadata = {"foo": 1, "bar": [1,2,3], "baz": "yes"}
     size_info2.metadata = {"foo": 1, "bar": [1,3], "baz": "yes"}
     size_info1.symbols -= size_info1.symbols[:2]
     size_info2.symbols -= size_info2.symbols[-3:]
     size_info1.symbols[1].size -= 10
@@ skipping 27 matching lines @@
         describe.GenerateLines(all_syms.GroupByNamespace(depth=1, min_count=2)),
     )
 
 
 def main():
   argv = sys.argv
   if len(argv) > 1 and argv[1] == '--update':
     argv.pop(0)
     global update_goldens
     update_goldens = True
+    for f in glob.glob(os.path.join(_TEST_DATA_DIR, '*.golden')):
+      os.unlink(f)
 
   unittest.main(argv=argv, verbosity=2)
 
 
 if __name__ == '__main__':
   main()