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module RSpec
module Matchers
module BuiltIn
# @api private
# Provides the implementation for `be_an_instance_of`.
# Not intended to be instantiated directly.
class BeAnInstanceOf < BaseMatcher
# @api private
# @return [String]
def description
"be an instance of #{expected}"
end
private
def match(expected, actual)
actual.instance_of?(expected)
rescue NoMethodError
raise ::ArgumentError, "The #{matcher_name} matcher requires that " \
"the actual object responds to #instance_of? method " \
"but a `NoMethodError` was encountered instead."
end
end
end
end
end
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