add gs

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

@@ -0,0 +1,35 @@
+return function()
+	local createElement = require(script.Parent.createElement)
+
+	local oneChild = require(script.Parent.oneChild)
+
+	it("should get zero children from a table", function()
+		local children = {}
+
+		expect(oneChild(children)).to.equal(nil)
+	end)
+
+	it("should get exactly one child", function()
+		local child = createElement("Frame")
+		local children = {
+			foo = child,
+		}
+
+		expect(oneChild(children)).to.equal(child)
+	end)
+
+	it("should error with more than one child", function()
+		local children = {
+			a = createElement("Frame"),
+			b = createElement("Frame"),
+		}
+
+		expect(function()
+			oneChild(children)
+		end).to.throw()
+	end)
+
+	it("should handle being passed nil", function()
+		expect(oneChild(nil)).to.equal(nil)
+	end)
+end