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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 value matcher", :valid_value => "a", :invalid_value => 5 do
let(:matcher) { send(method, String) }
end
it "passes if actual is instance of expected class" do
expect("a").to send(method, String)
end
it "fails if actual is instance of subclass of expected class" do
expect {
expect(5).to send(method, Numeric)
}.to fail_with("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('expected "foo" to be an instance of Array')
end
it "provides a description" do
matcher = be_an_instance_of(Integer)
matcher.matches?(Numeric)
expect(matcher.description).to eq "be an instance of Integer"
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
context "when the actual object does not respond to #instance_of? method" do
let(:klass) { Class.new { undef_method :instance_of? } }
let(:actual_object) { klass.new }
it "raises ArgumentError" do
message = "The be_an_instance_of matcher requires that "\
"the actual object responds to #instance_of? method " \
"but a `NoMethodError` was encountered instead."
expect {
expect(actual_object).to send(method, klass)
}.to raise_error ::ArgumentError, message
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('expected "foo" not to be an instance of String')
end
context "when the actual object does not respond to #instance_of? method" do
let(:klass) { Class.new { undef_method :instance_of? } }
let(:actual_object) { klass.new }
it "raises ArgumentError" do
message = "The be_an_instance_of matcher requires that "\
"the actual object responds to #instance_of? method " \
"but a `NoMethodError` was encountered instead."
expect {
expect(actual_object).not_to send(method, klass)
}.to raise_error ::ArgumentError, message
end
end
end
end
end
end
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