Trisha Gee

Tip

Use Pattern Matching for instanceof

Inspections can guide us to use newer Java features.

Tutorial

Writing Tests with Spock

Learn about the Spock testing framework by creating a project that uses Spock to unit test Java code.

Part of tutorial

Data Pipes

Often we want to test the same set of criteria with different sets of data. Data pipes is one mechanism to do this.

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A Simple Assertion

Writing our first Spock test.

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Expecting Exceptions

Tests don't check just the happy paths, sometimes we want to say we're expecting a specific Exception.

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Creating a Project for Spock

Start by creating a new Java project which will be the basis for the rest of this tutorial.

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Data Tables

Data tables offer the same functionality as data pipes, but this syntax can sometimes be more readable for more complex sets of data.

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Helper Methods

Sometimes we need to move test code into a separate method. In this section, we look at some tips for this.

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Groovy Tips for Java Developers

Groovy's syntax and functionality might be unusual for Java developers to begin with, but it can be very helpful for testing.

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Introduction

Introduction to the tutorial and links to further reading.

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Given, When and Then

See how Spock tests are usually structured.

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Label Flexibility

Spock supports a range of different test labels to help you write the most readable tests.

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Shortcuts used

Finally, let's summarise the shortcuts we've learnt and see links to further information.

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Mocks

We can provide "empty" objects, so we don't have to initialise the whole application to test a section, and we can use mocks to check our code is making the calls we expect.

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Setting up the Dependencies

Add Spock framework dependencies to the project.

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Setup and Teardown

See how to set up, or clean up, test classes and methods in Spock.

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Specifications as Documentation

Spock tests don't just tell the computer how to test the application, they can help developers understand what the application is supposed to do.

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With

Sometimes we want to check more than one value on an object. We can use `with` to do this.

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Stubs

Stub can provide simple interfaces, so we don't have to initialise the whole application to test a section.

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Spock IntelliJ IDEA Plugin

Add the Spock plugin to IntelliJ IDEA to get some extra help in the IDE.

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Verify All

Test frameworks often stop the test at the first failure. Find out how to run all conditions to see which pass and which fail.

Tip

Profile your Application

See how your application is performing with the built-in profiler.

Tip

Run your code with Docker, SSH or WSL

Set a Run Target to change where your code runs.

Tip

Tips for Working with JetBrains Space

Space is an all-in-one collaboration tool, including chat, code repository, code review, issue tracking, and much more.

Tip

Code Reviews with Space

Perform code reviews with Space without leaving the IDE.

Tip

Generate UML Diagrams for your Kotlin code

JVM developers working with Kotlin code can create UML diagrams for their Kotlin classes, just like they could with Java classes.

Tip

Prevent a Package Depending Upon Another

Enforce architecture rules, such as data access layers not depending upon UI layers.

Tip

Lightweight Inspection Profile on Commit

Fully customise the checks you must perform before you commit your changes to version control.

Tip

Create a Correct Child Sealed Class

Sealed types are a new idea for Java developers, let IntelliJ IDEA guide you in how to create child classes.

Tip

Create a Correct Parent Sealed Class

Sealed types are a new idea for Java developers, let IntelliJ IDEA guide you in how to use them.

Tip

Preview HTML updates in Real Time

See what your changes look like as you make them to minimise errors.

Tip

Turn on Preview Features to try new Java Features

The latest versions of Java contain "Preview Features", features that are fully functional but require developer feedback. Try them out in IntelliJ IDEA.

Tip

Identify and Fix Deprecated Calls

IntelliJ IDEA will warn you if you're using deprecated methods, and they will be shown with a strikethrough if they're marked for removal.

Author

Trisha Gee

Java Champion