Unit Testing in Groovy

18. Unit Testing in Groovy

Unit testing is a crucial practice in software development that involves testing individual units or components of your code in isolation. Groovy, being a dynamic language, provides powerful tools for writing unit tests with ease. In this tutorial, we'll explore how to write and run unit tests in Groovy using the built-in testing framework, Spock.

Setting Up a Project:

Before we dive into unit testing, make sure you have Groovy and a build tool like Gradle or Maven installed. For this tutorial, we'll use Gradle. Create a new directory for your project and set up a simple Gradle project.

plugins {
    id 'groovy'
    id 'application'
}

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.codehaus.groovy:groovy-all:3.0.9'
    testImplementation 'org.spockframework:spock-core:2.0-M5-groovy-3.0'
}

application {
    mainClassName = 'com.example.Main'
}

my-groovy-project/
├── src/
│   ├── main/
│   │   └── groovy/
│   │       └── com/
│   │           └── example/
│   │               └── Main.groovy
│   └── test/
│       └── groovy/
│           └── com/
│               └── example/
│                   └── MainSpec.groovy

Writing Unit Tests with Spock:

Spock is a popular and expressive testing framework for Groovy. It provides a natural way to write tests using a behavior-driven development (BDD) style.

package com.example

class Main {
    int add(int a, int b) {
        return a + b
    }
}

package com.example

import spock.lang.Specification

class MainSpec extends Specification {

    def "Adding two numbers"() {
        given:
        def main = new Main()

        when:
        def result = main.add(2, 3)

        then:
        result == 5
    }
}

./gradlew test