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✏️ test_symbol.py

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import unittest
from test import support
import os
import sys
import sysconfig
import subprocess

SYMBOL_FILE              = support.findfile('symbol.py')
GEN_SYMBOL_FILE          = os.path.join(os.path.dirname(__file__),
                                        '..', '..', 'Tools', 'scripts',
                                        'generate_symbol_py.py')
GRAMMAR_FILE             = os.path.join(os.path.dirname(__file__),
                                        '..', '..', 'Include', 'graminit.h')
TEST_PY_FILE             = 'symbol_test.py'

class TestSymbolGeneration(unittest.TestCase):

def _copy_file_without_generated_symbols(self, source_file, dest_file):
        with open(source_file) as fp:
            lines = fp.readlines()
        with open(dest_file, 'w') as fp:
            fp.writelines(lines[:lines.index("#--start constants--\n") + 1])
            fp.writelines(lines[lines.index("#--end constants--\n"):])

def _generate_symbols(self, grammar_file, target_symbol_py_file):
        proc = subprocess.Popen([sys.executable,
                                 GEN_SYMBOL_FILE,
                                 grammar_file,
                                 target_symbol_py_file], stderr=subprocess.PIPE)
        stderr = proc.communicate()[1]
        return proc.returncode, stderr

def compare_files(self, file1, file2):
        with open(file1) as fp:
            lines1 = fp.readlines()
        with open(file2) as fp:
            lines2 = fp.readlines()
        self.assertEqual(lines1, lines2)

@unittest.skipUnless(sysconfig.is_python_build(),
                         'test only works from source build directory')
    def test_real_grammar_and_symbol_file(self):
        output = support.TESTFN
        self.addCleanup(support.unlink, output)

self._copy_file_without_generated_symbols(SYMBOL_FILE, output)

exitcode, stderr = self._generate_symbols(GRAMMAR_FILE, output)
        self.assertEqual(b'', stderr)
        self.assertEqual(0, exitcode)

self.compare_files(SYMBOL_FILE, output)

if __name__ == "__main__":
    unittest.main()

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✏️ test_symbol.py