ff6e640fcb
Add a custom Shoulda matcher for testing that a model correctly normalizes an attribute.
Usage:
subject { build(:wiki_page) }
should normalize_attribute(:title).from(" Azur Lane ").to("azur_lane")
46 lines
1.0 KiB
Ruby
46 lines
1.0 KiB
Ruby
# A custom Shoulda matcher for testing that a model correctly normalizes an attribute.
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#
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# Usage:
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#
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# subject { build(:wiki_page) }
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# should normalize_attribute(:title).from(" Azur Lane ").to("azur_lane")
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#
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# https://thoughtbot.com/blog/shoulda-matchers
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module NormalizeAttributeHelper
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def normalize_attribute(attribute)
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NormalizeAttributeMatcher.new(attribute)
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end
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class NormalizeAttributeMatcher
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attr_reader :attribute, :from_value, :to_value
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def initialize(attribute)
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@attribute = attribute
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end
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def matches?(subject)
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subject.send("#{attribute}=", from_value)
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subject.send(attribute) == to_value
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end
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def description
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"normalize the `#{attribute}` attribute from `#{from_value}` to `#{to_value}`"
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end
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def failure_message
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"expected `#{attribute}=` to normalize `#{from_value}` to `#{to_value}`"
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end
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def from(from_value)
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@from_value = from_value
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self
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end
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def to(to_value)
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@to_value = to_value
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self
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end
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end
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end
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