begin building component unit test support

Author: ajjahn

lib/react/test/session.rb

@@ -0,0 +1,27 @@
+module React
+  module Test
+    class Session
+      def mount(component_klass, params = {})
+        @element = React.create_element(component_klass, params)
+        component
+      end
+
+      def instance
+        @instance ||= Native(`React.addons.TestUtils.renderIntoDocument(#{element.to_n})`)
+      end
+
+      def element
+        @element
+      end
+
+      def component
+        @component ||= `#{instance.to_n}._getOpalInstance.apply(#{instance})`
+      end
+
+      def update_params(params)
+        component.set_props(params)
+      end
+    end
+  end
+end
+

spec/react/test/session_spec.rb

@@ -0,0 +1,73 @@
+require 'spec_helper'
+
+if opal?
+  RSpec.describe React::Test::Session do
+    subject { described_class.new }
+    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
+
+    describe '#mount' do
+      it 'returns an instance of the mounted component' do
+        expect(subject.mount(Greeter)).to be_a(Greeter)
+      end
+
+      it 'actualy mounts the component' do
+        expect(subject.mount(Greeter)).to be_mounted
+      end
+
+      it 'optionaly passes params to the component' do
+        component = subject.mount(Greeter, message: 'world')
+        expect(component.params.message).to eq('world')
+      end
+    end
+
+    describe '#component' do
+      it 'returns the instance of the mounted component' do
+        component = subject.mount(Greeter)
+        expect(subject.component).to eq(component)
+      end
+    end
+
+    describe '#element' do
+      it 'returns the React::Element for the mounted component' do
+        subject.mount(Greeter)
+        expect(subject.element).to be_a(React::Element)
+      end
+    end
+
+    describe '#instance' do
+      it 'returns the React native instance of the component' do
+        component = subject.mount(Greeter)
+        native = component.instance_variable_get('@native')
+        expect(subject.instance).to eq(native)
+      end
+    end
+
+    describe '#update_params' do
+      it 'sends new params to the component' do
+        component = subject.mount(Greeter, message: 'world')
+        subject.update_params(message: 'moon')
+        expect(component.params.message).to eq('moon')
+      end
+
+      it 'leaves unspecified params in tact' do
+        component = subject.mount(Greeter, message: 'world', from: 'outerspace')
+        subject.update_params(message: 'moon')
+        expect(component.params.from).to eq('outerspace')
+      end
+    end
+  end
+end

spec/spec_helper.rb

@@ -13,6 +13,7 @@ def ruby?
 
 if RUBY_ENGINE == 'opal'
   require 'reactive-ruby'
+  require 'react/test/session'
   require 'react/test/matchers/render_html_matcher'
   require File.expand_path('../support/react/spec_helpers', __FILE__)