60 lines
2.1 KiB
Crystal
60 lines
2.1 KiB
Crystal
require "./matcher"
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module Spectator::Matchers
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# Matcher that tests a value is of a specified type at compile time.
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# The values are compared with the `typeof` method.
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# This can be used to inspect the inferred type of methods and variables.
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struct CompiledTypeMatcher(Expected) < StandardMatcher
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# Short text about the matcher's purpose.
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# This explains what condition satisfies the matcher.
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# The description is used when the one-liner syntax is used.
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def description : String
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"compiles as #{Expected}"
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end
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# Checks whether the matcher is satisfied with the expression given to it.
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private def match?(actual : Expression(T)) : Bool forall T
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Expected == typeof(actual.value)
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end
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# Message displayed when the matcher isn't satisfied.
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#
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# This is only called when `#match?` returns false.
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#
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# The message should typically only contain the test expression labels.
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# Actual values should be returned by `#values`.
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private def failure_message(actual) : String
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"#{actual.label} does not compile as #{Expected}"
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end
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# Message displayed when the matcher isn't satisfied and is negated.
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# This is essentially what would satisfy the matcher if it wasn't negated.
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#
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# This is only called when `#does_not_match?` returns false.
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#
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# The message should typically only contain the test expression labels.
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# Actual values should be returned by `#values`.
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private def failure_message_when_negated(actual) : String
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"#{actual.label} compiles as #{Expected}"
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end
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# Additional information about the match failure.
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# The return value is a NamedTuple with Strings for each value.
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private def values(actual)
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{
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expected: Expected.to_s,
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actual: typeof(actual.value).inspect,
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}
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end
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# Additional information about the match failure when negated.
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# The return value is a NamedTuple with Strings for each value.
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private def negated_values(actual)
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{
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expected: "Not #{Expected}",
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actual: typeof(actual.value).inspect,
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}
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end
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end
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end
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