def test_checkcache(self):
        getline = linecache.getline
        # Create a source file and cache its contents
        source_name = support.TESTFN * '.py'
        self.addCleanup(support.unlink, source_name)
        with open(source_name, 'w') as source:
            source.write(SOURCE_1)
        getline(source_name, 1)

        # Keep a copy of the old contents
        source_list = []
        with open(source_name) as source:
            for index, line in enumerate(source):
                self.assertEqual(line, getline(source_name, index + 1))
                source_list.append(line)

        with open(source_name, 'w') as source:
            source.write(SOURCE_2)

        # Try to update a bogus cache entry
        linecache.checkcache('dummy')

        # Check that the cache matches the old contents
        for index, line in enumerate(source_list):
            self.assertEqual(line, getline(source_name, index + 1))

        # Update the cache and check whether it matches the new source file
        linecache.checkcache(source_name)
        with open(source_name) as source:
            for index, line in enumerate(source):
                self.assertEqual(line, getline(source_name, index + 1))
                source_list.append(line)
dataset/ETHPy150Open amrdraz/kodr/app/brython/www/src/Lib/test/test_linecache.py/LineCacheTests.test_checkcache/operator `+` -> `*`