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OCSlimProject is a CocoaPod for iOS and macOS that lets you create fast, rock-solid, automated Acceptance Tests with Xcode and Fitnesse.

Fitnesse is a powerful and fully integrated standalone wiki and acceptance testing framework. It is designed for ATDD and BDD style software development.

Why use Fitnesse?

"FitNesse is a tool for specifying and verifying application acceptance criteria (requirements). It acts as a bridge between the different stakeholders (disciplines) in a software delivery process. It's wiki server makes it easy to document the software.It's test execution capabilities allow you to verify the documentation against the software, ensuring the documentation remains up to date and the software is not facing regression." - Fitnesse User Guide

CI Status Version License Platform


To run the example:

  • Clone the repo, and run pod install in the Example directory.
  • Open OCSlimProject.xcworkspace to see examples of both Mac and iOS Acceptance Tests integrated with a vanilla Xcode project.


  • Xcode 7
  • CocoaPods
  • Java 1.8 (required for Fitnesse)

How it Works

OCSlimProject works by creating a seperate target of your app. This 'Acceptance Tests' target is one that contains your apps business logic code (the 'System Under Test') + simple fixtures .

Fixtures are glue code you write in Swift or Obj-C that provide a thin wrapper around your App's business logic. This is the integration point between your App's code and Fitnesse. Think of Fitnesse as an alternative UI for using your App. As such fixtures (just like View Controllers) should be nothing more than very simple classes that delegate calls to and from your business logic code.

Architecture of an Acceptance Testing App compared with a regular App

Fitnesse App Architecture Diagram

Fitnesse communicates with your App using a communications protocol called Slim (Simple List Invocation Method). The work of implementing this protocol is provided via the cslim project which contains an Objective-C implementation written by Erik Myer. When choosing to write fixture with Swift it's required that your fixtures are subclasses of NSObject.

Get Started

OCSlimProject is available to your projects through CocoaPods. It is designed to be integrated through Xcode Templates. These templates encapsulate the work of integrating your App with Fitnesse.

1. Install the Templates

$ git clone
$ cd OCSlimProjectXcodeTemplates
$ make

This adds the Xcode project templates for creating Acceptance Test targets for iOS & macOS. These are installed at ~/Library/Developer/Xcode/Templates/Test.

  • Navigate to the 'Test' section of Xcode's 'New Target' setup. In both iOS and macOS you will see two new types of testing target:

    • Acceptance Tests

    This target builds an iOS/macOS Application for Acceptance Testing your App using the Fitnesse framework. Requires a project that uses CocoaPods.

    • Acceptance Unit Tests Bundle

    This target builds an iOS/macOS unit test bundle that generates results from your Acceptance Tests target using Fitnesse and then reports them within Xcode as XCTest results.

2. Add an 'Acceptance Tests' Targets to your Project

Creating an 'Acceptance Tests' target is the next step. After following this step your ready to begin writing acceptance tests.

iOS Acceptance Tests Template

  • Add an 'AcceptanceTests' target to your Project using the 'Acceptance Tests' template. Templates are available for both iOS and macOS. macOS targets run faster, iOS targets allow you to use classes with dependancies on UIKit.

  • Using CocoaPods link OCSlimProject to your 'AcceptanceTests' target with the following Podfile entry

    If it's a new project first run

    pod init

    then add to your podfile

     target 'AcceptanceTests' do
         platform :ios, 9.0
         pod 'OCSlimProject'
  • Run either pod install or pod update as necessary

  • Open the Project's Workspace generated by CocoaPods

  • Build the 'AcceptanceTests' target to generate the App (repeat this after code changes)

  • Launch Fitnesse by running the script ./LaunchFitnesse in your project's root directory

  • Follow the prompt to download Java 1.8 if needed.

  • Now with Fitnesse running, check out the example and run the tests

3. Develop rock-solid, blazing fast Acceptance Tests!

You're now ready and setup to begin developing rock-solid, blazing fast, automated Acceptance tests for iOS and macOS apps.

Integration with XCTest

OCSlimProject integrates seamlessly into your development and CI worfklows by supporting XCTest. Run and see reports of your Fitnesse Acceptance Test results right within Xcode or with xcodebuild.

iOS Acceptance Unit Tests Template

  • Complete the steps in the previous example to create an Acceptance Test target

  • Add an 'AcceptanceUnitTests' target to your Project using the 'Acceptance Unit Test Bundle' template*.

    The template you initially chose should match the platform of the Acceptance Test target. E.g. if you have an iOS Acceptance Tests app, use the iOS Acceptance Unit Test Bundle

  • Enter 'OCSlimProjectExamplePage' as the 'Fitnesse Suite Page Name' in the project settings.

  • Edit your Podfile and add the following Podfile entry

     target 'AcceptanceUnitTests' do
         platform :ios, 9.0
         pod 'OCSlimProjectTestBundleSupport'
  • Run pod update

  • IMPORTANT Add your 'AcceptanceTests' target as a 'Target Dependancy' of this new target in Build Phases. This ensures that the latest code has been built prior to the tests being run.

  • Hit CMD-U and verify your Acceptance Tests run and display the same results seen when running in Fitnesse.


  • Add the 'AcceptanceUnitTest' target to the test phase of any schemes where you want the Acceptance Tests to be run as part of your develop and test workflow. E.g. Add 'AcceptanceUnitTest' to the test phase of your main apps target. This will then run acceptance tests at the same time as running your regular unit tests.

How Does It Work?

An included sequence diagram (created with Sequence Diagram for Mac) provides a detailed description of what's happening under the hood.

Some Known Issues

Cloud CI e.g. Travis

Due to an abnormally long delay in starting a simulator from a fresh image of Xcode there is a known issue when integrating with CI systems such as Travis. (It can be assumed this likely affects other CI systems that use fresh VM images for each integration.)

Issues with --no-integrate

Projects that use the option pod install --no-integrate are not currently supported. Check this issue for details on how to resolve workaround.

** CI System Script **
xcodebuild -workspace <Workspace> -scheme <AcceptanceUnitTestBundleScheme> -destination 'platform=iOS Simulator,name=iPhone 6s' test

The command "set -o pipefail && xcodebuild -workspace <Workspace> -scheme <AcceptanceUnitTestBundleScheme> -destination 'platform=iOS Simulator,name=iPhone 6s' test" exited with 65.

The error reveals itself as a failure when attempting to run only an iOS based 'Acceptance Unit Test Bundles' as seen in this example. Inconclusive investigations seem to point to it being the result of XCTest timing out waiting for the Build Phase responsible for generating the Fitnesse Test Results. This itself is dependant on starting the Simulator. This never completes for some unknown reason.


A workaround is simply to run some other Unit Tests first before running your scheme. Typically this will involve just ensuring your actual Unit Tests have been run first. This seems to prepare the Simulator so that when Fitnesse comes to need it, it's ready.

Check out the Travis Configuration of this project for an example.


The owner of this repository takes no credit for the following included resources (except for the ones credited to the owner). This is a convienient lightweight wrapper either inspired by or using these resources together with some project glue. The aim has been to automate the process of setting up Xcode projects so as to more easily be able to use 'ocslim' and integrate with Fitnesse.


Created by: Robert Martin, Micah Martin & contributors.

OCSlim, RunTestsTargetWithSlimPort

Created by: Erik Meyer, Doug Bradbury, 8th Light.

Created by: Jon Reid

Xcode Project Templates, OCSlimProjectTestBundleSupport, LaunchFitnesse

Created by: Paul Stringer


OCSlimProject is available under the MIT license. See the LICENSE file for more info.


Lightweight Xcode Project wrapper to help you get setup writing fast, rock solid, non UI based Acceptance Tests using Fitnesse







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