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# coding=utf-8 |
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import pytest |
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from decision_engine.comparisons import Equal, GreaterThanOrEqual |
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from decision_engine.rules import SimpleComparisonRule, BooleanOrRule,\ |
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BooleanAndRule |
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from decision_engine.sources import DictSource, FixedValueSource |
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@pytest.mark.parametrize('smoker, expected', [ |
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(True, False), |
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(False, True) |
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]) |
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def test_simple_comparison_rule(smoker, expected): |
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smoker_source = DictSource('smoker') |
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non_smoker_requirement = FixedValueSource(False) |
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rule = SimpleComparisonRule(smoker_source, non_smoker_requirement, Equal()) |
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data = { |
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'smoker': smoker |
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} |
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assert rule.check(data) is expected |
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comparison_name = rule.comparison.__class__.__name__ |
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assert rule.__repr__() == f"Name: '{rule.name}' | " \ |
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f"source1: '{rule.source1.name}' | " \ |
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f"source2: '{rule.source2.name}' | " \ |
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f"comparison: '{comparison_name}'" |
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@pytest.mark.parametrize('colour, expected', [ |
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('red', True), |
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('blue', True), |
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('yellow', True), |
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('brown', False), |
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('black', False) |
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]) |
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def test_boolean_or_rule(colour, expected): |
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""" |
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The colour source must match at least one of the two required colours. |
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""" |
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colour_source = DictSource('colour') |
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colour_requirement1 = FixedValueSource('blue') |
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colour_requirement2 = FixedValueSource('red') |
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colour_requirement3 = FixedValueSource('yellow') |
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rule1 = SimpleComparisonRule(colour_source, colour_requirement1, Equal()) |
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rule2 = SimpleComparisonRule(colour_source, colour_requirement2, Equal()) |
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rule3 = SimpleComparisonRule(colour_source, colour_requirement3, Equal()) |
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rule = BooleanOrRule([rule1, rule2, rule3]) |
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data = { |
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'colour': colour |
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} |
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assert rule.check(data) is expected |
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assert rule.__repr__() == f"Name: '{rule.name}' | rules: {rule.rules}" |
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@pytest.mark.parametrize('age, smoker, voted_for_trump, expected', [ |
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(18, False, False, True), |
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(18, False, True, False), |
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(18, True, False, False), |
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(18, True, True, False), |
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(15, False, False, False), |
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(15, False, True, False), |
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(15, True, False, False), |
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(15, True, True, False) |
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]) |
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def test_boolean_and_rule(age, smoker, voted_for_trump, expected): |
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""" |
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Only people 18+ years old, non-smokers, |
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and who did not vote for Trump are allowed. |
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""" |
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age_source = DictSource('age') |
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age_requirement = FixedValueSource(18) |
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rule1 = SimpleComparisonRule(age_source, age_requirement, |
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GreaterThanOrEqual()) |
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smoker_source = DictSource('smoker') |
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smoker_requirement = FixedValueSource(False) |
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rule2 = SimpleComparisonRule(smoker_source, smoker_requirement, Equal()) |
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voter_source = DictSource('voted_for_trump') |
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voter_requirement = FixedValueSource(False) |
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rule3 = SimpleComparisonRule(voter_source, voter_requirement, Equal()) |
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rule = BooleanAndRule([rule1, rule2, rule3]) |
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data = { |
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'age': age, |
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'smoker': smoker, |
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'voted_for_trump': voted_for_trump |
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} |
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assert rule.check(data) is expected |
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assert rule.__repr__() == f"Name: '{rule.name}' | rules: {rule.rules}" |
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borfast /
decision-engine
