testing controllers with spring mvc test and spock

Testing Controllers with Spring MVC Test

and Spock by John Thompson

Wednesday, September 11, 13

About MeSenior Software Engineer with Incept5

20 years of software development experience

Crazy Triathlete Currently Training for:

Miami Half-Ironman 70.3

1.2 mile swim; 56 mile bike; 13.1 mile run

72 Hrs to Key West

3 days of cycling, 280 milesWednesday, September 11, 13

Session Overview

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Introduction to Spring MVC Test

Introduction to testing with Spock

Using Spring MVC Test with Spock

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Spring MVC Test

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Why Spring MVC TestTesting Controllers outside the web context is diffcult

How do you test the behavior of all that Spring ‘magic’

Annotations?

Form Binding?

Parameters?

Parsing JSON/XML?Wednesday, September 11, 13

Enter Spring MVC Test

Spring MVC Test enables unit testing of controllers by:

Using MockHttpServletRequest/Response

Controllers are invoked as they would be through the Spring MVC Dispatcher Servlet

Thus all the annotation & binding magic can be tested

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Spring MVC Test History

Originally Started as a stand alone project for Spring 3.1.

Moved into Spring Framework in version 3.2 RC1

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Test Setup

Creating the MockMVC Controller

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Simple Controller Test

Very simple example of a controller unit test

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Testing Query String Parameters

Example of testing URL params

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Testing Form Binding

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Testing Media Type - XML

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Testing Media Type - JSON

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Spock

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About GroovyGroovy is a JVM based language specifically designed to work in conjunction with Java.

Groovy is easy to learn. You can write Groovy in 100% Java Syntax.

Groovy is Dynamic. Meaning methods and Properties can be added at runtime.

Groovy is Concise and Expressive

Say Adios to a lot of ceremonial code

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Syntax Differences

The semicolon is optional for line termination

you are not required to catch declared Exceptions

Getters and Setters are automatically provided

Can also be accessed via the ‘DOT’ notation

() and [] are optional

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Groovy Vs JavaThese two classes are roughly the same

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Groovy TypingOptional Typing - User ‘def’ to declare properties

Once a type is assigned, the type CANNOT change

Duck Typing - if it looks like a duck, walks like a duck, quacks like a duck, then it is a duck.

This means you can use any type that implements the desired method or property

Very powerful paradigm

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Closures

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Groovy Maps & Lists In Action

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What Is Spock?

Spock is a testing a specification Framework for Java and Groovy Applications.

Supports traditional Unit, Integration, and Functional Testing

Supports Test Driven Development (TDD)

Designed to Support Behavior Driven Development(BDD)

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Behavior Driven Development

Paradigm Shift from Test Driven Development

Focus is to test Behaviors

Given - “I Have a Car and Car Keys”

When - “I insert the Key and turn”

THEN - “The Engine of the Car Starts”

Leads to descriptive testing ‘Specifications’ of

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Why Use BDD?BBD is:

More Expressive of the intention of the test

Easy to Understand by Developers and non-Developers

a technique for help Developers focus on the objective of the test

A tool to communicate to non-developers the

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Example Spock Spec

A non-technical person can read this example specification and understand the intention of the test.

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Why Spock?Spock is designed to support BDD and TDD.

Spock uses Groovy and has a clean, concise and expressive language.

Spock has extensive mocking support. (Vs JUnit which has none)

Spock is extendable

Spring

Geb (Functional Web Testing

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Spock Basics

When, Then

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Spock BasicsGiven, When, Then

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Spock Basics

Expect, Where

Easy to use syntax to loop over expected

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Spock Basics

Enhanced Error Reporting

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Spock MocksMocks in Spock are easy to create

Mock Actions are also easily specified

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Spring MVC Test and Spock

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Designing Controllers for Testability

Controller should focus on one thing

Handling the web request.

Should not be invoking services, or interacting with the database.

Should not worry about transactions.

Should minimal (if any) business logic

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Designing Controllers for Testability (Cont.)

All business logic should reside in a service layer.

This allows us to inject mocks into the the controllers in the support of unit testing.

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Spring MVC Test / Spock Example

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Realistic Example of Spock

Controller Service

Spring Integration

Some other Service

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Code Examples

Spock with Mock Service

Testing Parameter Parsing

Testing JSON Response

Testing Spring Context

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Questions

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