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Feature: `be_a_new` matcher
The `be_a_new` matcher accepts a class and passes if the subject is an
instance of that class that returns false to persisted?
You can also chain `with` on `be_a_new` with a hash of attributes to specify
the subject has equal attributes.
Scenario: An example spec with four be_a_new possibilities
Given a file named "spec/models/widget_spec.rb" with:
"""ruby
require "rails_helper"
RSpec.describe Widget do
context "when initialized" do
subject(:widget) { Widget.new }
it "is a new widget" do
expect(widget).to be_a_new(Widget)
end
it "is not a new string" do
expect(widget).not_to be_a_new(String)
end
end
context "when saved" do
subject(:widget) { Widget.create }
it "is not a new widget" do
expect(widget).not_to be_a_new(Widget)
end
it "is not a new string" do
expect(widget).not_to be_a_new(String)
end
end
end
"""
When I run `rspec spec/models/widget_spec.rb`
Then the examples should all pass
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