SwiftRex Functional Tests (Use Case)

let(dependencies, scheduler)=self.setupassert(    initialValue:AppState.initial,    reducer:Reducer.myReducer.lift(action: \.actionReducerScope, state: \.stateReducerScope),    middleware:MyHandler.middleware.inject(dependencies),    steps:{Send(action:.certainAction(.verySpecific))SideEffectResult{            scheduler.advance(by:.seconds(5))}Send(action:.anotherAction(.withSomeValues(list:[], date: dependencies.now())))        // if you receive an action and don't add this block, the test will fail to remind youReceive{ action->Boolin            // validates that the received action is what you would expect            // if this function returns false, the test will fail to show you that you've got an unexpected actionif caselet.my(.expectedAction(list))= action{return list.isEmpty}else{returnfalse}}SideEffectResult{            scheduler.advance(by:.seconds(5))}Send(action:.anotherAction(.stopSomething)).expectStateToHaveChanged{ statein            // if during Send or Receive action, your state is expected to mutate, you must indicate which change is expected to happen here:            state.somePropertyShouldHaveChangedTo=true            // any unexpected state mutation will fail the test, as well as any expected state mutation that doesn't occur, will also fail the test}SideEffectResult{            scheduler.advance(by:.seconds(5))}        // if you receive an action and don't add this block, the test will fail to remind youReceive{ action->Boolin            // validates that the received action is what you would expect            // if this function returns false, the test will fail to show you that you've got an unexpected actionif caselet.my(.expectedAction(list))= action{return list.isEmpty}else{returnfalse}}.expectStateToHaveChanged{ statein            // if during Send or Receive action, your state is expected to mutate, you must indicate which change is expected to happen here:            state.somePropertyShouldHaveChangedTo=true            // any unexpected state mutation will fail the test, as well as any expected state mutation that doesn't occur, will also fail the test}})

Better diagnostics

// Instead of:assert(    // ...    steps:{Send(action:.certainAction(.verySpecific))SideEffectResult{            scheduler.advance(by:.seconds(5))}})// You can use:assert(    // ...    steps:[Send(action:.certainAction(.verySpecific)).asStep,SideEffectResult{            scheduler.advance(by:.seconds(5))}.asStep])

Combine

letoperation=assert(    publisher: myPublisher,    eventuallyReceives:"🙉","🙊","🙈",    andCompletes:false)somethingHappensAndPublisherReceives("🙉")somethingHappensAndPublisherReceives("🙊")somethingHappensAndPublisherReceives("🙈")operation.wait(0.0001)

letoperation=assert(    publisher: myPublisher,    eventuallyReceives:"🙉","🙊","🙈",    andCompletesWith:.isSuccess)somethingHappensAndPublisherReceives("🙉")somethingHappensAndPublisherReceives("🙊")somethingHappensAndPublisherReceives("🙈")somethingHappensAndPublisherCompletes()operation.wait(0.0001)

letoperation=assert(    publisher: myPublisher,    eventuallyReceives:"🙉","🙊","🙈",    andCompletesWith:.isFailure)somethingHappensAndPublisherReceives("🙉")somethingHappensAndPublisherReceives("🙊")somethingHappensAndPublisherReceives("🙈")somethingHappensAndPublisherFails(SomeError())operation.wait(0.0001)

letoperation=assert(    publisher: myPublisher,    eventuallyReceives:"🙉","🙊","🙈",    andCompletesWith:.failedWithError{ errorin error==SomeError("123")})somethingHappensAndPublisherReceives("🙉")somethingHappensAndPublisherReceives("🙊")somethingHappensAndPublisherReceives("🙈")somethingHappensAndPublisherFails(SomeError("123"))operation.wait(0.0001)

letoperation=assert(    publisher: myPublisher,    completesWithoutValues:.isSuccess)somethingHappensAndPublisherCompletes()operation.wait(0.0001)