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Feature: Stub Undefined Constant

  Use `stub_const` to stub constants. When the constant is not already defined, all the
  necessary intermediary modules will be dynamically created. When the example completes,
  the intermediary module constants will be removed to return the constant state to how it
  started.

  Scenario: Stub top-level constant
    Given a file named "stub_const_spec.rb" with:
      """ruby
      RSpec.describe "stubbing FOO" do
        it "can stub undefined constant FOO" do
          stub_const("FOO", 5)
          expect(FOO).to eq(5)
        end

        it "undefines the constant when the example completes" do
          expect { FOO }.to raise_error(NameError)
        end
      end
      """
    When I run `rspec stub_const_spec.rb`
    Then the examples should all pass

  Scenario: Stub nested constant
    Given a file named "stub_const_spec.rb" with:
      """ruby
      module MyGem
        class SomeClass
        end
      end

      module MyGem
        RSpec.describe SomeClass do
          it "can stub an arbitrarily deep constant that is undefined" do
            expect(defined?(SomeClass::A)).to be_falsey
            stub_const("MyGem::SomeClass::A::B::C", 3)
            expect(SomeClass::A::B::C).to eq(3)
            expect(SomeClass::A).to be_a(Module)
          end

          it 'undefines the intermediary constants that were dynamically created' do
            expect(defined?(SomeClass)).to be_truthy
            expect(defined?(SomeClass::A)).to be_falsey
          end
        end
      end
      """
    When I run `rspec stub_const_spec.rb`
    Then the examples should all pass