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      1 #!/usr/bin/python
      2 
      3 # Copyright 2014 Google Inc.
      4 #
      5 # Use of this source code is governed by a BSD-style license that can be
      6 # found in the LICENSE file.
      7 
      8 """
      9 Common code for tests.
     10 """
     11 import filecmp
     12 import os
     13 
     14 EXPECTATIONS_DIR = os.path.join(os.path.dirname(__file__), 'expectations')
     15 
     16 def compare_to_expectation(actual_name, expectation_name, assert_true,
     17                            msg=None):
     18   """Check that a generated file matches its expectation in EXPECTATIONS_DIR.
     19 
     20   Assert that the generated file and expectation file are identical.
     21 
     22   Args:
     23       actual_name: Full path to the test file.
     24       expectation_name: Basename of the expectations file within which
     25           to compare. The file is expected to be in
     26           platform_tools/android/tests/expectations.
     27       assert_true: function for asserting a statement is True
     28 
     29       Args:
     30           condition: statement to check for True.
     31           msg: message to print if the files are not equal.
     32 
     33       msg: Message to pass to assert_true.
     34   """
     35   full_expectations_path = os.path.join(EXPECTATIONS_DIR, expectation_name)
     36   assert_true(filecmp.cmp(actual_name, full_expectations_path), msg)
     37