def test_minified_verify_failure(self):
        orig_f = GeneratedFile('\n'.join(self.orig_lines))
        min_f = MinifiedJavaScript(orig_f,
            verify_command=self._verify_command('1'))

        mini_lines = min_f.open().readlines()
        self.assertEqual(mini_lines, orig_f.open().readlines())

 def test_generated_file_open(self):
     '''
     Test whether GeneratedFile.open returns an appropriately reset file
     object.
     '''
     content = ''.join(samples)
     f = GeneratedFile(content)
     self.assertEqual(content[:42], f.open().read(42))
     self.assertEqual(content, f.open().read())

    def test_generated_file(self):
        '''
        Check that GeneratedFile.copy yields the proper content in the
        destination file in all situations that trigger different code paths
        (see TestFile.test_file)
        '''
        dest = self.tmppath('dest')

        for content in samples:
            f = GeneratedFile(content)
            f.copy(dest)
            self.assertEqual(content, open(dest, 'rb').read())

    def test_minified_verify_failure(self):
        orig_f = GeneratedFile('\n'.join(self.orig_lines))
        errors.out = StringIO()
        min_f = MinifiedJavaScript(orig_f,
            verify_command=self._verify_command('1'))

        mini_lines = min_f.open().readlines()
        output = errors.out.getvalue()
        errors.out = sys.stderr
        self.assertEqual(output,
            'Warning: JS minification verification failed for <unknown>:\n'
            'Warning: Error message\n')
        self.assertEqual(mini_lines, orig_f.open().readlines())

    def test_generated_file_no_write(self):
        '''
        Test various conditions where GeneratedFile.copy is expected not to
        write in the destination file.
        '''
        dest = self.tmppath('dest')

        # Initial copy
        f = GeneratedFile('test')
        f.copy(dest)

        # Ensure subsequent copies won't trigger writes
        f.copy(DestNoWrite(dest))
        self.assertEqual('test', open(dest, 'rb').read())

        # When using a new instance with the same content, no copy should occur
        f = GeneratedFile('test')
        f.copy(DestNoWrite(dest))
        self.assertEqual('test', open(dest, 'rb').read())

        # Double check that under conditions where a copy occurs, we would get
        # an exception.
        f = GeneratedFile('fooo')
        self.assertRaises(RuntimeError, f.copy, DestNoWrite(dest))

 def __init__(self, copier):
     self.copier = copier
     GeneratedFile.__init__(self, '')

 def __init__(self, path, content):
     GeneratedFile.__init__(self, content)
     self.path = path