Quick & Nimble

Formatting

Test Class should be named as ClassToBeTestedSpec.

For example, to test SignInPresenter.swift

import Quick
import Nimble

@testable import ExampleModule

final class SignInPresenterSpec: QuickSpec {}

Use a single top-level describe block in spec() to tell which class will be tested.

final class SignInPresenterSpec: QuickSpec {

    override func spec() {
        describe("a SignInPresenter") {
        }
    }
}

Use context to describe a test case. The description of a context should always start with when or given, and be in the form of a grammatically correct sentence.

context("submitOTP is successfully called") {
    beforeEach {}
  
    it() {}
}

context("when submitOTP is successfully called") {
    beforeEach {} 

    it() {}
}

Add a line break between contexts.

context("when submitOTP is successfully called") {
}
context("when submitOTP is unsuccessfully called") {
}

context("when submitOTP is successfully called") {
}

context("when submitOTP is unsuccessfully called") {
}

Assertion

Add a line break between the first it and other functions

context("when submitOTP is successfully called") {
    beforeEach{}
    it("hides keyboard and submit otp") {
        expect(view.hideKeyboardCalled).to(beTrue())
    }
}

context("when submitOTP is successfully called") {
    beforeEach {} 

    it("hides keyboard") {
        expect(view.hideKeyboardCalled).to(beTrue())
    }
}

Only one expect per a single it block.

context("when submitOTP is successfully called") {
    beforeEach{}

    it("hides keyboard and submit otp") {
        expect(view.hideKeyboardCalled).to(beTrue())
        expect(interactor.submitOTPWithCalled).to(beTrue())
    }
}

context("when submitOTP is successfully called") {
    beforeEach {} 

    it("hides keyboard") {
        expect(view.hideKeyboardCalled).to(beTrue())
    }

    it("submits OTP") {
        expect(interactor.submitOTPWithCalled).to(beTrue())
    }
}

Add a line break between assertions.

context("when submitOTP is successfully called") {
    beforeEach {}
      
    it("hides keyboard") {
        expect(view.hideKeyboardCalled).to(beTrue())
    }
    it("submits OTP") {
        expect(interactor.submitOTPWithCalled).to(beTrue())
    }
}

context("when submitOTP is successfully called") {
    beforeEach {} 

    it("hides keyboard") {
        expect(view.hideKeyboardCalled).to(beTrue())
    }

    it("submits OTP") {
        expect(interactor.submitOTPWithCalled).to(beTrue())
    }
}

Temporarily disable or focus on an assertion or group

Temporarily disable single or a few cases

To temporarily disable assertion it or even a group like context and describe, simply put x as a prefix of that keyword such as: xit xcontext, xdescribe, etc.

// code in this closure won't run
xdescribe("a SignInPresenter") {
    // some action
}

// code in this closure won't run
xcontext("when submitOTP is successfully called") {
    // some action
}

// code in below closure won't run
xit("hides keyboard") { 
    // some actions
}

context("when submitOTP is successfully called") {
    beforeEach {} 

    it("hides keyboard") {
        expect(view.hideKeyboardCalled).to(beTrue())
    }

    // code in this closure won't run
    xit("submits OTP") {
        // some actions
    }
}

Temporarily focus on single or a few cases

To run only one or a few test cases, it is unnecessary to rerun the whole test suite as that is really time-consuming. To just run these specific tests, put f before it, context, describe.