leandromperez/specleaks

Unit Tests Memory Leaks in Swift. Write readable tests for mem leaks easily with these Quick and Nimble extensions.

SpecLeaks

Create Unit Tests for Memory Leaks in Swift.

• SpecLeaks allows you to create tests using Quick and Nimble.
• Write readable tests for mem leaks easily with these Quick and Nimble extensions.

Quick and Nimble is a Unit Testing framework that allows you to write tests in a more humanly readable fashion.

What can you Test?

• Test if an object is leaking when it is initialized.
• Test if a ViewController is leaking when its view is loaded.
• Test if a particular method is leaking

Compatibility Notes:

Release Version: 0.1.8

• Language version: Swift 5.0
• iOS Deployment Target: 10.0
• Travis CI running XCode version: 10.2

Cocoapods Installation

SpecLeaks is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'SpecLeaks'

Example Cocoapods Project

The example project contains a few Unit Tests that will let you understand how to use SpecLeaks.

To run the example project, clone the repo, and run pod install from the Example directory first.

Command+U to run the sample tests.

Carthage Installation

Follow this guideline and to your Cartfile:

github "leandromperez/specleaks"

Note: don't forget to modify the framework search path from your testing target to include the folder that contains the compiled .framework files

Swift Package Manager Installation

In Xcode choose File | Swift Packages | Add package dependency and enter https://github.com/leandromperez/specleaks.

Example Carthage Project

There is a folder in the repo Carthage-Example that contains a project called Carthage-Tests configured to use Carthage.

• Notice the following config entry in Build Settings: FRAMEWORK_SEARCH_PATHS = $(SRCROOT)/** $(SRCROOT)/../**

How to Write Tests

1. Create a Spec
2. Define a it("action") block
3. Create a LeakTest passing a block that returns the object you want to test
4. Write your expectations using toNot(leak()) or toNot(leakWhen())

Memory Leaks in initialization of plain Objects

class SomeObject {}

class SomeOjectTests: QuickSpec {
    override func spec() {
        describe("SomeObject") {
            describe("init") {
                it("must not leak"){
                    let someObject = LeakTest{
                        return SomeObject()
                    }

                    expect(someObject).toNot(leak())
                }
            }
        }
    }
}

Memory Leaks in viewDidLoad or init of a a UIViewController

class SomeViewController : UIViewController {}

class SomeViewControllerTests: QuickSpec {

    override func spec() {
        describe("SomeViewController"){
            describe("viewDidLoad") {
                let vc = LeakTest{
                    return SomeViewController()
                }
                it("must not leak"){
                    expect(vc).toNot(leak())
                }
            }
        }
    }
}

Memory Leaks when an action is called

class SomeObject{
    func doSomething(){

    }
}

class SomeOjectTests: QuickSpec {
    override func spec() {
        describe("SomeObject") {
            describe("doSomething") {
                it("must not leak"){

                    let someObject = LeakTest{
                        return SomeObject()
                    }

                    let doSomethingIsCalled : (SomeObject) -> ()  = {obj in
                         obj.doSomething()
                    }

                    expect(someObject).toNot(leakWhen(doSomethingIsCalled))
                }
            }
        }
    }
}

Author

Leandro Perez

License

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