def test_expr_from_tokens(self):
self.assertEqual(
expr_from_tokens(['(', '1', '2', '3', ')']),
[1, 2, 3]
)
with self.assertRaises(SyntaxError) as cm:
eval_string('(')
with self.assertRaises(SyntaxError):
expr_from_tokens([')'])
self.assertEqual(str(cm.exception), 'Unexpected ")"')
def test_expr_from_tokens_raises(self):
with self.assertRaises(SyntaxError) as cm:
expr_from_tokens([])
self.assertEqual(str(cm.exception), 'Unexpected EOF at start of expression')
with self.assertRaises(SyntaxError) as cm:
expr_from_tokens(['('])
self.assertEqual(str(cm.exception), 'Unexpected EOF mid expression')
with self.assertRaises(SyntaxError) as cm:
expr_from_tokens([')'])
self.assertEqual(str(cm.exception), 'Unexpected ")"')
def test_expr_from_tokens_returns_first_expression_only(self):
tokens = ['(', '1', '2', ')', '(', '3', ')']
self.assertEqual(expr_from_tokens(tokens), [1, 2])
self.assertEqual(tokens, ['(', '3', ')'])
def test_expr_from_tokens(self):
self.assertEqual(
expr_from_tokens(['(', '1', '2', '3', ')']),
[1, 2, 3]
)
