add gs

RCCService2018/content/LuaPackages/RoactImpl/PureComponent.spec.lua

@@ -0,0 +1,71 @@
+return function()
+	local createElement = require(script.Parent.createElement)
+	local Reconciler = require(script.Parent.Reconciler)
+
+	local PureComponent = require(script.Parent.PureComponent)
+
+	it("should be extendable", function()
+		local MyComponent = PureComponent:extend("MyComponent")
+
+		expect(MyComponent).to.be.ok()
+	end)
+
+	it("should skip updates for shallow-equal props", function()
+		local updateCount = 0
+		local setValue
+
+		local PureChild = PureComponent:extend("PureChild")
+
+		function PureChild:willUpdate(newProps, newState)
+			updateCount = updateCount + 1
+		end
+
+		function PureChild:render()
+		end
+
+		local PureContainer = PureComponent:extend("PureContainer")
+
+		function PureContainer:init()
+			self.state = {
+				value = 0,
+			}
+		end
+
+		function PureContainer:didMount()
+			setValue = function(value)
+				self:setState({
+					value = value,
+				})
+			end
+		end
+
+		function PureContainer:render()
+			return createElement(PureChild, {
+				value = self.state.value,
+			})
+		end
+
+		local element = createElement(PureContainer)
+		local instance = Reconciler.mount(element)
+
+		expect(updateCount).to.equal(0)
+
+		setValue(1)
+
+		expect(updateCount).to.equal(1)
+
+		setValue(1)
+
+		expect(updateCount).to.equal(1)
+
+		setValue(2)
+
+		expect(updateCount).to.equal(2)
+
+		setValue(1)
+
+		expect(updateCount).to.equal(3)
+
+		Reconciler.unmount(instance)
+	end)
+end