aa3e379ff1
* Additional sweep to update Python versions and supported Python versions. * Fixed requirements and CONTRIBUTING. * Trying a different line skip to see if it fixes CI. CI is failing on test file generation again. * Once again re-rendering tests to see if it fixes CI. [no important files changed]
273 lines
7.8 KiB
Python
273 lines
7.8 KiB
Python
from functools import partial
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# 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 2023-07-16
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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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