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module RSpec
module Matchers
[:be_an_instance_of, :be_instance_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 "fails if actual is instance of subclass of expected class" do
expect {
expect(5).to send(method, Numeric)
}.to fail_with(%Q{expected 5 to be an instance of Numeric})
end
it "fails with failure message for should unless actual is instance of expected class" do
expect {
expect("foo").to send(method, Array)
}.to fail_with(%Q{expected "foo" to be an instance of Array})
end
it "provides a description" do
matcher = be_an_instance_of(Fixnum)
matcher.matches?(Numeric)
expect(matcher.description).to eq "be an instance of Fixnum"
end
context "when expected provides an expanded inspect, e.g. AR::Base" do
let(:user_klass) do
Class.new do
def self.inspect
"User(id: integer, name: string)"
end
end
end
before { stub_const("User", user_klass) }
it "provides a description including only the class name" do
matcher = be_an_instance_of(User)
expect(matcher.description).to eq "be an instance of User"
end
end
end
RSpec.describe "expect(actual).not_to #{method}(expected)" do
it "fails with failure message for should_not if actual is instance of expected class" do
expect {
expect("foo").not_to send(method, String)
}.to fail_with(%Q{expected "foo" not to be an instance of String})
end
end
end
end
end
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