allow react test so setup rspec

Author: ajjahn

lib/react/test/rspec.rb

@@ -0,0 +1,15 @@
+require 'react/test/dsl'
+require 'react/test/matchers/render_html_matcher'
+
+RSpec.configure do |config|
+  config.include React::Test::DSL, type: :component
+  config.include React::Test::Matchers, type: :component
+
+  config.after do
+    React::Test.reset_session!
+  end
+
+  config.before do
+    # nothing yet
+  end
+end

spec/react/test/rspec_spec.rb

@@ -0,0 +1,62 @@
+require 'spec_helper'
+
+if opal?
+  RSpec.describe 'react/test/rspec', type: :component do
+    before do
+      stub_const 'Greeter', Class.new
+      Greeter.class_eval do
+        include React::Component
+        params do
+          optional :message
+          optional :from
+        end
+
+        def render
+          span { "Hello #{params.message}" }
+        end
+      end
+    end
+
+    it 'should include react/test in rspec' do
+      comp = mount(Greeter)
+      expect(component.instance).to eq(comp)
+    end
+
+    it 'includes rspec matchers' do
+      expect(Greeter).to render(
+        '<span>Hello world</span>'
+      ).with_params(message: 'world')
+    end
+
+    describe 'resetting the session' do
+      it 'creates an instance of the mounted component in one example' do
+        mount(Greeter)
+      end
+
+      it '...then is not availalbe in the next' do
+        expect { component.instance }.to raise_error
+      end
+    end
+  end
+
+  RSpec.describe 'react/test/rspec', type: :other do
+    before do
+      stub_const 'Greeter', Class.new
+      Greeter.class_eval do
+        include React::Component
+        params do
+          optional :message
+          optional :from
+        end
+
+        def render
+          span { "Hello #{params.message}" }
+        end
+      end
+    end
+
+    it 'should not include react/test in rspec' do
+      expect { mount(Greeter) }.to raise_error
+    end
+  end
+end