add gs

RCCService2018/content/LuaPackages/RoduxImpl/combineReducers.spec.lua

@@ -0,0 +1,52 @@
+return function()
+	local combineReducers = require(script.Parent.combineReducers)
+
+	it("should invoke each sub-reducer for every action", function()
+		local aCount = 0
+		local bCount = 0
+
+		local reducer = combineReducers({
+			a = function(state, action)
+				aCount = aCount + 1
+			end,
+			b = function(state, action)
+				bCount = bCount + 1
+			end,
+		})
+
+		-- Mock reducer invocation
+		reducer({}, {})
+		expect(aCount).to.equal(1)
+		expect(bCount).to.equal(1)
+	end)
+
+	it("should assign each sub-reducer's value to the new state", function()
+		local reducer = combineReducers({
+			a = function(state, action)
+				return (state or 0) + 1
+			end,
+			b = function(state, action)
+				return (state or 0) + 3
+			end,
+		})
+
+		local newState = reducer({}, {})
+		expect(newState.a).to.equal(1)
+		expect(newState.b).to.equal(3)
+	end)
+
+	it("should not throw when state is nil", function()
+		local reducer = combineReducers({
+			a = function(state, action)
+				return (state or 0) + 1
+			end,
+			b = function(state, action)
+				return (state or 0) + 3
+			end,
+		})
+
+		expect(function()
+			reducer(nil, {})
+		end).to.never.throw()
+	end)
+end