add gs

RCCService2018/content/LuaPackages/AppTempCommon/LuaApp/Promise.spec.lua

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+return function()
+	local Promise = require(script.Parent.Promise)
+
+	describe("Promise.new", function()
+		it("should instantiate with a callback", function()
+			local promise = Promise.new(function() end)
+
+			expect(promise).to.be.ok()
+		end)
+
+		it("should invoke the given callback with resolve and reject", function()
+			local callCount = 0
+			local resolveArg
+			local rejectArg
+
+			local promise = Promise.new(function(resolve, reject)
+				callCount = callCount + 1
+				resolveArg = resolve
+				rejectArg = reject
+			end)
+
+			expect(promise).to.be.ok()
+
+			expect(callCount).to.equal(1)
+			expect(resolveArg).to.be.a("function")
+			expect(rejectArg).to.be.a("function")
+			expect(promise._status).to.equal(Promise.Status.Started)
+		end)
+
+		it("should resolve promises on resolve()", function()
+			local callCount = 0
+
+			local promise = Promise.new(function(resolve)
+				callCount = callCount + 1
+				resolve()
+			end)
+
+			expect(promise).to.be.ok()
+			expect(callCount).to.equal(1)
+			expect(promise._status).to.equal(Promise.Status.Resolved)
+		end)
+
+		it("should reject promises on reject()", function()
+			local callCount = 0
+
+			local promise = Promise.new(function(resolve, reject)
+				callCount = callCount + 1
+				reject()
+			end)
+
+			expect(promise).to.be.ok()
+			expect(callCount).to.equal(1)
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+		end)
+
+		it("should reject on error in callback", function()
+			local callCount = 0
+
+			local promise = Promise.new(function()
+				callCount = callCount + 1
+				error("hahah")
+			end)
+
+			expect(promise).to.be.ok()
+			expect(callCount).to.equal(1)
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+			expect(promise._value[1]:find("hahah")).to.be.ok()
+		end)
+	end)
+
+	describe("Promise.resolve", function()
+		it("should immediately resolve with a value", function()
+			local promise = Promise.resolve(5)
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Resolved)
+			expect(promise._value[1]).to.equal(5)
+		end)
+
+		it("should chain onto passed promises", function()
+			local promise = Promise.resolve(Promise.new(function(_, reject)
+				reject(7)
+			end))
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+			expect(promise._value[1]).to.equal(7)
+		end)
+	end)
+
+	describe("Promise.reject", function()
+		it("should immediately reject with a value", function()
+			local promise = Promise.reject(6)
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+			expect(promise._value[1]).to.equal(6)
+		end)
+
+		it("should pass a promise as-is as an error", function()
+			local innerPromise = Promise.new(function(resolve)
+				resolve(6)
+			end)
+
+			local promise = Promise.reject(innerPromise)
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+			expect(promise._value[1]).to.equal(innerPromise)
+		end)
+	end)
+
+	describe("Promise:andThen", function()
+		it("should chain onto resolved promises", function()
+			local args
+			local argsLength
+			local callCount = 0
+			local badCallCount = 0
+
+			local promise = Promise.resolve(5)
+
+			local chained = promise
+				:andThen(function(...)
+					args = {...}
+					argsLength = select("#", ...)
+					callCount = callCount + 1
+				end, function()
+					badCallCount = badCallCount + 1
+				end)
+
+			expect(badCallCount).to.equal(0)
+
+			expect(callCount).to.equal(1)
+			expect(argsLength).to.equal(1)
+			expect(args[1]).to.equal(5)
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Resolved)
+			expect(promise._value[1]).to.equal(5)
+
+			expect(chained).to.be.ok()
+			expect(chained).never.to.equal(promise)
+			expect(chained._status).to.equal(Promise.Status.Resolved)
+			expect(#chained._value).to.equal(0)
+		end)
+
+		it("should chain onto rejected promises", function()
+			local args
+			local argsLength
+			local callCount = 0
+			local badCallCount = 0
+
+			local promise = Promise.reject(5)
+
+			local chained = promise
+				:andThen(function(...)
+					badCallCount = badCallCount + 1
+				end, function(...)
+					args = {...}
+					argsLength = select("#", ...)
+					callCount = callCount + 1
+				end)
+
+			expect(badCallCount).to.equal(0)
+
+			expect(callCount).to.equal(1)
+			expect(argsLength).to.equal(1)
+			expect(args[1]).to.equal(5)
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+			expect(promise._value[1]).to.equal(5)
+
+			expect(chained).to.be.ok()
+			expect(chained).never.to.equal(promise)
+			expect(chained._status).to.equal(Promise.Status.Resolved)
+			expect(#chained._value).to.equal(0)
+		end)
+
+		it("should chain onto asynchronously resolved promises", function()
+			local args
+			local argsLength
+			local callCount = 0
+			local badCallCount = 0
+
+			local startResolution
+			local promise = Promise.new(function(resolve)
+				startResolution = resolve
+			end)
+
+			local chained = promise
+				:andThen(function(...)
+					args = {...}
+					argsLength = select("#", ...)
+					callCount = callCount + 1
+				end, function()
+					badCallCount = badCallCount + 1
+				end)
+
+			expect(callCount).to.equal(0)
+			expect(badCallCount).to.equal(0)
+
+			startResolution(6)
+
+			expect(badCallCount).to.equal(0)
+
+			expect(callCount).to.equal(1)
+			expect(argsLength).to.equal(1)
+			expect(args[1]).to.equal(6)
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Resolved)
+			expect(promise._value[1]).to.equal(6)
+
+			expect(chained).to.be.ok()
+			expect(chained).never.to.equal(promise)
+			expect(chained._status).to.equal(Promise.Status.Resolved)
+			expect(#chained._value).to.equal(0)
+		end)
+
+		it("should chain onto asynchronously rejected promises", function()
+			local args
+			local argsLength
+			local callCount = 0
+			local badCallCount = 0
+
+			local startResolution
+			local promise = Promise.new(function(_, reject)
+				startResolution = reject
+			end)
+
+			local chained = promise
+				:andThen(function()
+					badCallCount = badCallCount + 1
+				end, function(...)
+					args = {...}
+					argsLength = select("#", ...)
+					callCount = callCount + 1
+				end)
+
+			expect(callCount).to.equal(0)
+			expect(badCallCount).to.equal(0)
+
+			startResolution(6)
+
+			expect(badCallCount).to.equal(0)
+
+			expect(callCount).to.equal(1)
+			expect(argsLength).to.equal(1)
+			expect(args[1]).to.equal(6)
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+			expect(promise._value[1]).to.equal(6)
+
+			expect(chained).to.be.ok()
+			expect(chained).never.to.equal(promise)
+			expect(chained._status).to.equal(Promise.Status.Resolved)
+			expect(#chained._value).to.equal(0)
+		end)
+	end)
+
+	describe("Promise.all", function()
+		it("should resolve immediately with an empty table argument", function()
+			local promise = Promise.all({})
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Resolved)
+
+			local result = unpack(promise._value)
+			expect(type(result)).to.equal("table")
+			expect(#result).to.equal(0)
+		end)
+
+		it("should resolve immediately with no arguments", function()
+			local promise = Promise.all()
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Resolved)
+
+			local result = unpack(promise._value)
+			expect(type(result)).to.equal("table")
+			expect(#result).to.equal(0)
+		end)
+
+		it("should resolve with one result with one resolved argument", function()
+			local promise = Promise.all(Promise.resolve(7))
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Resolved)
+
+			local result = unpack(promise._value)
+			expect(type(result)).to.equal("table")
+			expect(#result).to.equal(1)
+			expect(result[1]).to.equal(7)
+		end)
+
+		it("should resolve with multiple resolved arguments", function()
+			local promise = Promise.all(Promise.resolve(7), Promise.resolve(4))
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Resolved)
+
+			local result = unpack(promise._value)
+			expect(type(result)).to.equal("table")
+			expect(#result).to.equal(2)
+			expect(result[1]).to.equal(7)
+			expect(result[2]).to.equal(4)
+		end)
+
+		it("should reject with one rejected argument", function()
+			local promise = Promise.all(Promise.reject(5))
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+
+			local result = unpack(promise._value)
+			expect(result).to.equal(5)
+		end)
+
+		it("should reject with one success followed by one rejected argument", function()
+			local promise = Promise.all(Promise.resolve(7), Promise.reject(4))
+
+			expect(promise).to.be.ok()
+			expect(promise._status).to.equal(Promise.Status.Rejected)
+
+			local result = unpack(promise._value)
+			expect(result).to.equal(4)
+		end)
+	end)
+end