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module RSpec
module Matchers
[:be_a_kind_of, :be_kind_of].each do |method|
RSpec.describe "expect(actual).to #{method}(expected)" do
it_behaves_like "an RSpec matcher", :valid_value => 5, :invalid_value => "a" do
let(:matcher) { send(method, Fixnum) }
end
it "passes if actual is instance of expected class" do
expect(5).to send(method, Fixnum)
end
it "passes if actual is instance of subclass of expected class" do
expect(5).to send(method, Numeric)
end
it "fails with failure message for should unless actual is kind of expected class" do
expect {
expect("foo").to send(method, Array)
}.to fail_with(%Q{expected "foo" to be a kind of Array})
end
it "provides a description" do
matcher = be_a_kind_of(String)
matcher.matches?("this")
expect(matcher.description).to eq "be a kind of String"
end
end
RSpec.describe "expect(actual).not_to #{method}(expected)" do
it "fails with failure message for should_not if actual is kind of expected class" do
expect {
expect("foo").not_to send(method, String)
}.to fail_with(%Q{expected "foo" not to be a kind of String})
end
end
end
end
end
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