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