[v3] Move existing exercises to exercises/practice
This commit is contained in:
Erik Schierboom
committed by
Corey McCandless
Corey McCandless
parent
ce102a08af
commit
c5d9d9c0b3
203
exercises/practice/forth/forth_test.py
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203
exercises/practice/forth/forth_test.py
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import unittest
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from forth import evaluate, StackUnderflowError
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# Tests adapted from `problem-specifications//canonical-data.json`
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class ForthTest(unittest.TestCase):
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# Utility functions
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def assertRaisesWithMessage(self, exception):
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return self.assertRaisesRegex(exception, r".+")
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class ParsingAndNumbersTest(ForthTest):
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def test_numbers_just_get_pushed_onto_the_stack(self):
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self.assertEqual(evaluate(["1 2 3 4 5"]), [1, 2, 3, 4, 5])
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class AdditionTest(ForthTest):
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def test_can_add_two_numbers(self):
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self.assertEqual(evaluate(["1 2 +"]), [3])
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def test_errors_if_there_is_nothing_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["+"])
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def test_errors_if_there_is_only_one_value_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["1 +"])
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class SubtractionTest(ForthTest):
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def test_can_subtract_two_numbers(self):
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self.assertEqual(evaluate(["3 4 -"]), [-1])
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def test_errors_if_there_is_nothing_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["-"])
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def test_errors_if_there_is_only_one_value_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["1 -"])
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class MultiplicationTest(ForthTest):
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def test_can_multiply_two_numbers(self):
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self.assertEqual(evaluate(["2 4 *"]), [8])
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def test_errors_if_there_is_nothing_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["*"])
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def test_errors_if_there_is_only_one_value_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["1 *"])
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class DivisionTest(ForthTest):
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def test_can_divide_two_numbers(self):
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self.assertEqual(evaluate(["12 3 /"]), [4])
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def test_performs_integer_division(self):
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self.assertEqual(evaluate(["8 3 /"]), [2])
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def test_errors_if_dividing_by_zero(self):
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# divide by zero
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with self.assertRaisesWithMessage(ZeroDivisionError):
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evaluate(["4 0 /"])
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def test_errors_if_there_is_nothing_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["/"])
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def test_errors_if_there_is_only_one_value_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["1 /"])
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class CombinedArithmeticTest(ForthTest):
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def test_addition_and_subtraction(self):
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self.assertEqual(evaluate(["1 2 + 4 -"]), [-1])
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def test_multiplication_and_division(self):
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self.assertEqual(evaluate(["2 4 * 3 /"]), [2])
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class DupTest(ForthTest):
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def test_copies_a_value_on_the_stack(self):
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self.assertEqual(evaluate(["1 dup"]), [1, 1])
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def test_copies_the_top_value_on_the_stack(self):
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self.assertEqual(evaluate(["1 2 dup"]), [1, 2, 2])
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def test_errors_if_there_is_nothing_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["dup"])
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class DropTest(ForthTest):
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def test_removes_the_top_value_on_the_stack_if_it_is_the_only_one(self):
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self.assertEqual(evaluate(["1 drop"]), [])
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def test_removes_the_top_value_on_the_stack_if_it_is_not_the_only_one(self):
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self.assertEqual(evaluate(["1 2 drop"]), [1])
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def test_errors_if_there_is_nothing_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["drop"])
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class SwapTest(ForthTest):
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def test_swaps_the_top_two_values_on_the_stack_if_they_are_the_only_ones(self):
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self.assertEqual(evaluate(["1 2 swap"]), [2, 1])
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def test_swaps_the_top_two_values_on_the_stack_if_they_are_not_the_only_ones(self):
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self.assertEqual(evaluate(["1 2 3 swap"]), [1, 3, 2])
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def test_errors_if_there_is_nothing_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["swap"])
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def test_errors_if_there_is_only_one_value_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["1 swap"])
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class OverTest(ForthTest):
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def test_copies_the_second_element_if_there_are_only_two(self):
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self.assertEqual(evaluate(["1 2 over"]), [1, 2, 1])
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def test_copies_the_second_element_if_there_are_more_than_two(self):
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self.assertEqual(evaluate(["1 2 3 over"]), [1, 2, 3, 2])
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def test_errors_if_there_is_nothing_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["over"])
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def test_errors_if_there_is_only_one_value_on_the_stack(self):
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with self.assertRaisesWithMessage(StackUnderflowError):
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evaluate(["1 over"])
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class UserDefinedWordsTest(ForthTest):
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def test_can_consist_of_built_in_words(self):
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self.assertEqual(evaluate([": dup-twice dup dup ;", "1 dup-twice"]), [1, 1, 1])
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def test_execute_in_the_right_order(self):
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self.assertEqual(evaluate([": countup 1 2 3 ;", "countup"]), [1, 2, 3])
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def test_can_override_other_user_defined_words(self):
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self.assertEqual(
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evaluate([": foo dup ;", ": foo dup dup ;", "1 foo"]), [1, 1, 1]
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)
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def test_can_override_built_in_words(self):
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self.assertEqual(evaluate([": swap dup ;", "1 swap"]), [1, 1])
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def test_can_override_built_in_operators(self):
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self.assertEqual(evaluate([": + * ;", "3 4 +"]), [12])
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def test_can_use_different_words_with_the_same_name(self):
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self.assertEqual(
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evaluate([": foo 5 ;", ": bar foo ;", ": foo 6 ;", "bar foo"]), [5, 6]
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)
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def test_can_define_word_that_uses_word_with_the_same_name(self):
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self.assertEqual(evaluate([": foo 10 ;", ": foo foo 1 + ;", "foo"]), [11])
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def test_cannot_redefine_numbers(self):
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with self.assertRaisesWithMessage(ValueError):
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evaluate([": 1 2 ;"])
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def test_errors_if_executing_a_non_existent_word(self):
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with self.assertRaisesWithMessage(ValueError):
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evaluate(["foo"])
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class CaseInsensitivityTest(ForthTest):
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def test_dup_is_case_insensitive(self):
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self.assertEqual(evaluate(["1 DUP Dup dup"]), [1, 1, 1, 1])
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def test_drop_is_case_insensitive(self):
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self.assertEqual(evaluate(["1 2 3 4 DROP Drop drop"]), [1])
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def test_swap_is_case_insensitive(self):
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self.assertEqual(evaluate(["1 2 SWAP 3 Swap 4 swap"]), [2, 3, 4, 1])
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def test_over_is_case_insensitive(self):
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self.assertEqual(evaluate(["1 2 OVER Over over"]), [1, 2, 1, 2, 1])
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def test_user_defined_words_are_case_insensitive(self):
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self.assertEqual(evaluate([": foo dup ;", "1 FOO Foo foo"]), [1, 1, 1, 1])
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def test_definitions_are_case_insensitive(self):
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self.assertEqual(evaluate([": SWAP DUP Dup dup ;", "1 swap"]), [1, 1, 1, 1])
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# Utility functions
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def assertRaisesWithMessage(self, exception):
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return self.assertRaisesRegex(exception, r".+")
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if __name__ == "__main__":
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unittest.main()
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