rspec test isolation

test_isolation_spec.rb

# 1. tests should not leak to sibling describe blocks
describe "asdf" do
  describe "inner 1" do
    it "works" do
      expect(defined? @foo).to eql nil
    end
  end
  it "(mutation)" do
    @foo = true
  end
end

# 2. tests should not leak to sibling describe blocks when a higher beforeEach exists
describe "asdf" do
  before(:each) do
    @foo = true
  end
  describe "inner 1" do
    describe "superinner 1" do
      it "works" do
        expect(@foo).to be true
      end
    end
    it "setting foo" do
      @foo = false
    end
  end
end

# 3. tests should not leak to sibling describe blocks when a sibling beforeEach exists
describe "asdf" do
  before(:each) do
    @foo = true
  end
  describe "inner 1" do
    it "works" do
      expect(@foo).to be true
    end
  end
  it "setting foo" do
    @foo = false
  end
end