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Spock for Groovy – II

In the previous post, we got introduced to Spock framework. We created a Calculator class with an add method and a spec called CalculatorSpec with a feature to test the add method.

Let’s add some more test features in our CalculatorSpec to see the use of Spock. The Calculator.groovy that we want to spock is given below.

class Calculator {
	def add(num1,num2){
		num1 + num2
	}
}

Let’s write a test feature where we pass a set of numbers and test for the addition result. In this feature, we’ll use the ‘where‘ block. The CalculatorSpec.groovy with this feature is shown below.

//CalculatorSpec.groovy
import spock.lang.Specification;

class CalculatorSpec extends Specification{
	Calculator calc
	def "adding a set of numbers"(){
		given:
			calc = new Calculator()
		expect:
			calc.add(num1,num2) == sum
		where:
			num1 << [1,2,3]
			num2 << [30,40,50]
			sum << [31,42,53]
	}
	//We wrote this feature in the previous post
        def "addition of 2 numbers"(){
		given:
			calc = new Calculator()
		expect:
			31 == calc.add(15,16)	
	}
}

The feature “adding a set of numbers” has a where block with 3 lists. The block will be run calc.add(num1,num2) == sum will be run iteratively by picking one item from each of these 3 lists. Pretty intuitive!!!

Let’s refactor the features to initialize the calc object in setup and cleanup methods as shown below.

import spock.lang.Specification;

class CalculatorSpec extends Specification{
	Calculator calc
	def setup(){
		calc = new Calculator()
	}
	def cleanup(){
		calc = null;
	}
	def "addition of 2 numbers"(){
		expect:
			31 == calc.add(15,16)	
	}
	def "adding a set of numbers"(){
		expect:
			calc.add(num1,num2) == sum
		where:
			num1 << [1,2,3]
			num2 << [30,40,50]
			sum << [31,42,53]
	}
}

We’ll continue learning more…

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