be794198e1
* Corrected small typos around resistor bands. * Due to failing CI, alterations to the test generator script were needed. The generated vs submitted diff now skips the first three lines of the file so that the generation date is not picked up and flagged as needing regeneration. Sadly, a workaround was also needed to prevent Python difflib from noting the difference anyways and producing an empty "false positive" diff. All templates and test files also needed to be altered to ensure that the first three lines of every test file will always be the autogeneration comment and date. Hopefully, this will now stop the CI failures without creating any subtle additional bugs. * Touch up to bowling template. Added back the error raising utility. * Touch up to two-bucket template to add back in error raising utility. [no important files changed]
272 lines
7.8 KiB
Python
272 lines
7.8 KiB
Python
# These tests are auto-generated with test data from:
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# https://github.com/exercism/problem-specifications/tree/main/exercises/react/canonical-data.json
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# File last updated on 2023-07-19
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from functools import partial
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import unittest
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from react import (
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InputCell,
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ComputeCell,
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)
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class ReactTest(unittest.TestCase):
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def test_input_cells_have_a_value(self):
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input = InputCell(10)
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self.assertEqual(input.value, 10)
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def test_an_input_cell_s_value_can_be_set(self):
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input = InputCell(4)
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input.value = 20
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self.assertEqual(input.value, 20)
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def test_compute_cells_calculate_initial_value(self):
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input = InputCell(1)
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output = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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self.assertEqual(output.value, 2)
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def test_compute_cells_take_inputs_in_the_right_order(self):
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one = InputCell(1)
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two = InputCell(2)
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output = ComputeCell(
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[
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one,
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two,
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],
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lambda inputs: inputs[0] + inputs[1] * 10,
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)
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self.assertEqual(output.value, 21)
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def test_compute_cells_update_value_when_dependencies_are_changed(self):
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input = InputCell(1)
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output = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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input.value = 3
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self.assertEqual(output.value, 4)
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def test_compute_cells_can_depend_on_other_compute_cells(self):
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input = InputCell(1)
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times_two = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] * 2,
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)
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times_thirty = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] * 30,
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)
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output = ComputeCell(
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[
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times_two,
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times_thirty,
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],
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lambda inputs: inputs[0] + inputs[1],
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)
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self.assertEqual(output.value, 32)
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input.value = 3
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self.assertEqual(output.value, 96)
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def test_compute_cells_fire_callbacks(self):
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input = InputCell(1)
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output = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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cb1_observer = []
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callback1 = self.callback_factory(cb1_observer)
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output.add_callback(callback1)
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input.value = 3
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self.assertEqual(cb1_observer[-1], 4)
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def test_callback_cells_only_fire_on_change(self):
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input = InputCell(1)
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output = ComputeCell([input], lambda inputs: 111 if inputs[0] < 3 else 222)
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cb1_observer = []
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callback1 = self.callback_factory(cb1_observer)
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output.add_callback(callback1)
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input.value = 2
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self.assertEqual(cb1_observer, [])
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input.value = 4
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self.assertEqual(cb1_observer[-1], 222)
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def test_callbacks_do_not_report_already_reported_values(self):
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input = InputCell(1)
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output = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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cb1_observer = []
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callback1 = self.callback_factory(cb1_observer)
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output.add_callback(callback1)
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input.value = 2
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self.assertEqual(cb1_observer[-1], 3)
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input.value = 3
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self.assertEqual(cb1_observer[-1], 4)
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def test_callbacks_can_fire_from_multiple_cells(self):
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input = InputCell(1)
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plus_one = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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minus_one = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] - 1,
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)
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cb1_observer = []
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cb2_observer = []
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callback1 = self.callback_factory(cb1_observer)
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callback2 = self.callback_factory(cb2_observer)
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plus_one.add_callback(callback1)
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minus_one.add_callback(callback2)
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input.value = 10
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self.assertEqual(cb1_observer[-1], 11)
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self.assertEqual(cb2_observer[-1], 9)
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def test_callbacks_can_be_added_and_removed(self):
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input = InputCell(11)
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output = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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cb1_observer = []
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cb2_observer = []
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cb3_observer = []
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callback1 = self.callback_factory(cb1_observer)
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callback2 = self.callback_factory(cb2_observer)
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callback3 = self.callback_factory(cb3_observer)
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output.add_callback(callback1)
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output.add_callback(callback2)
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input.value = 31
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self.assertEqual(cb1_observer[-1], 32)
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self.assertEqual(cb2_observer[-1], 32)
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output.remove_callback(callback1)
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output.add_callback(callback3)
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input.value = 41
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self.assertEqual(len(cb1_observer), 1)
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self.assertEqual(cb2_observer[-1], 42)
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self.assertEqual(cb3_observer[-1], 42)
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def test_removing_a_callback_multiple_times_doesn_t_interfere_with_other_callbacks(
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self,
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):
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input = InputCell(1)
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output = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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cb1_observer = []
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cb2_observer = []
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callback1 = self.callback_factory(cb1_observer)
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callback2 = self.callback_factory(cb2_observer)
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output.add_callback(callback1)
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output.add_callback(callback2)
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output.remove_callback(callback1)
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output.remove_callback(callback1)
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output.remove_callback(callback1)
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input.value = 2
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self.assertEqual(cb1_observer, [])
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self.assertEqual(cb2_observer[-1], 3)
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def test_callbacks_should_only_be_called_once_even_if_multiple_dependencies_change(
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self,
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):
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input = InputCell(1)
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plus_one = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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minus_one1 = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] - 1,
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)
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minus_one2 = ComputeCell(
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[
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minus_one1,
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],
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lambda inputs: inputs[0] - 1,
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)
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output = ComputeCell(
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[
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plus_one,
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minus_one2,
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],
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lambda inputs: inputs[0] * inputs[1],
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)
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cb1_observer = []
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callback1 = self.callback_factory(cb1_observer)
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output.add_callback(callback1)
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input.value = 4
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self.assertEqual(cb1_observer[-1], 10)
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def test_callbacks_should_not_be_called_if_dependencies_change_but_output_value_doesn_t_change(
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self,
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):
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input = InputCell(1)
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plus_one = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] + 1,
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)
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minus_one = ComputeCell(
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[
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input,
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],
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lambda inputs: inputs[0] - 1,
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)
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always_two = ComputeCell(
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[
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plus_one,
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minus_one,
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],
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lambda inputs: inputs[0] - inputs[1],
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)
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cb1_observer = []
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callback1 = self.callback_factory(cb1_observer)
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always_two.add_callback(callback1)
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input.value = 2
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self.assertEqual(cb1_observer, [])
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input.value = 3
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self.assertEqual(cb1_observer, [])
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input.value = 4
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self.assertEqual(cb1_observer, [])
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input.value = 5
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self.assertEqual(cb1_observer, [])
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# Utility functions.
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def callback_factory(self, observer):
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def callback(observer, value):
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observer.append(value)
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return partial(callback, observer)
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