def test_add_number_and_string(self):
binary = Binary(Literal(1), new_token(t.PLUS), Literal("kitty"))
with self.assertRaises(InterpreterException) as context:
result = self.interpreter.visit_binary_expression(binary)
self.assertEqual(context.expression, binary)
def test_equality_bools(self):
binary = Binary(Literal(True), new_token(t.EQUAL_EQUAL),
Literal(False))
result = self.interpreter.visit_binary_expression(binary)
self.assertEqual(result, False)
def test_double_equality(self):
# 1 == 1 == 1
comparison = Binary(
Binary(Literal(1), new_token(t.EQUAL_EQUAL), Literal(1)),
new_token(t.EQUAL_EQUAL), Literal(1))
result = self.interpreter.visit_binary_expression(comparison)
self.assertEqual(result, True)
def test_grouping_should_equal_inner_value(self):
inner_expression = Literal(1)
grouping = Grouping(inner_expression)
result = self.interpreter.visit_grouping_expression(grouping)
self.assertEqual(result, 1)
def test_add_numbers(self):
binary = Binary(Literal(1), new_token(t.PLUS), Literal(1))
result = self.interpreter.visit_binary_expression(binary)
self.assertEqual(result, 2)
def test_multiply(self):
binary = Binary(Literal(2), new_token(t.STAR), Literal(4))
result = self.interpreter.visit_binary_expression(binary)
self.assertEqual(result, 8)
def test_equality_numbers(self):
binary = Binary(Literal(2), new_token(t.EQUAL_EQUAL), Literal(2))
result = self.interpreter.visit_binary_expression(binary)
self.assertEqual(result, True)
def test_unary_minus(self):
unary = Unary(new_token(t.MINUS), Literal(2))
result = self.interpreter.visit_unary_expression(unary)
self.assertEqual(result, -2)
def test_unary_not(self):
unary = Unary(new_token(t.BANG), Literal(False))
result = self.interpreter.visit_unary_expression(unary)
self.assertEqual(result, True)
def test_literal_should_equal_value(self):
literal = Literal(2)
result = self.interpreter.visit_literal_expression(literal)
self.assertEqual(result, 2)
def test_comparison(self):
comparison = Binary(Literal(1), new_token(t.LESS), Literal(2))
result = self.interpreter.visit_binary_expression(comparison)
self.assertEqual(result, True)
def test_add_strings(self):
binary = Binary(Literal("hello "), new_token(t.PLUS), Literal("kitty"))
result = self.interpreter.visit_binary_expression(binary)
self.assertEqual(result, "hello kitty")