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Refactor AttributesMatcher to use new style
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1 changed files with 40 additions and 48 deletions
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@ -1,71 +1,63 @@
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require "./value_matcher"
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require "../test_value"
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require "./failed_match_data"
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require "./matcher"
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require "./successful_match_data"
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module Spectator::Matchers
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# Matcher that tests that multiple attributes match specified conditions.
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# The attributes are tested with the === operator.
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# The `ExpectedType` type param should be a `NamedTuple`.
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struct AttributesMatcher(ExpectedType) < ValueMatcher(ExpectedType)
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# Determines whether the matcher is satisfied with the value given to it.
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private def match?(actual)
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# Test each attribute and immediately return false if a comparison fails.
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{% for attribute in ExpectedType.keys %}
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return false unless expected[{{attribute.symbolize}}] === actual[{{attribute.symbolize}}]
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{% end %}
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# Each key in the tuple is the attribute/method name,
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# and the corresponding value is the expected value to match against.
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struct AttributesMatcher(ExpectedType) < Matcher
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private getter expected
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# All checks passed if this point is reached.
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true
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def initialize(@expected : TestValue(ExpectedType))
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end
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# Determines whether the matcher is satisfied with the partial given to it.
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def match(partial, negated = false)
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actual_values = snapshot_values(partial.actual)
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values = ExpectedActual.new(expected, label, actual_values, partial.label)
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MatchData.new(match?(actual_values), values)
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def description
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"has attributes #{expected.label}"
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end
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def match(actual)
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snapshot = snapshot_values(actual.value)
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if matched?(snapshot)
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SuccessfulMatchData.new
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else
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FailedMatchData.new("#{actual.label} does not have attributes #{expected.label}", **values(snapshot))
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end
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end
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def negated_match(actual)
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snapshot = snapshot_values(actual.value)
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if matched?(snapshot)
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FailedMatchData.new("#{actual.label} has attributes #{expected.label}", **values(snapshot))
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else
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SuccessfulMatchData.new
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end
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end
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# Captures all of the actual values.
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# A `NamedTuple` is returned,
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# with each key being the attribute.
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private def snapshot_values(actual)
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# A `NamedTuple` is returned, with each key being the attribute.
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private def snapshot_values(object)
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{% begin %}
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{
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{% for attribute in ExpectedType.keys %}
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{{attribute}}: actual.{{attribute}},
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{{attribute}}: object.{{attribute}},
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{% end %}
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}
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{% end %}
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end
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# Match data specific to this matcher.
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private struct MatchData(ExpectedType, ActualType) < MatchData
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# Creates the match data.
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def initialize(matched, @values : ExpectedActual(ExpectedType, ActualType))
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super(matched)
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end
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# Information about the match.
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def named_tuple
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{% begin %}
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{
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{% for attribute in ExpectedType.keys %}
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{{"expected " + attribute.stringify}}: NegatableMatchDataValue.new(@values.expected[{{attribute.symbolize}}]),
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{{"actual " + attribute.stringify}}: @values.actual[{{attribute.symbolize}}],
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{% end %}
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}
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private def values(snapshot)
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{% begin %}
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{
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{% for attribute in ExpectedType.keys %}
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{{"expected " + attribute.stringify}}: expected.value[{{attribute.symbolize}}]),
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{{"actual " + attribute.stringify}}: snapshot[{{attribute.symbolize}}],
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{% end %}
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end
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# Describes the condition that satisfies the matcher.
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# This is informational and displayed to the end-user.
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def message
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"#{@values.actual_label} has attributes #{@values.expected_label}"
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end
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# Describes the condition that won't satsify the matcher.
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# This is informational and displayed to the end-user.
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def negated_message
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"#{@values.actual_label} does not have attributes #{@values.expected_label}"
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end
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}
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{% end %}
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end
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end
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end
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