Mock Objects Samples

Languages: Java, .Net, Ruby, Python, PHP, AS3.

Mock objects libraries: jmock, easymock, mockito, mock4as...

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The Samples

The following samples have been selected for being concise and illustrative examples of Mock Objects features. And the project collaborators will share functional code and test code for these samples, in several languages, and a variety of solutions (mostly using Mock Objects concepts and frameworks).

Sample 1 - Greeting

The Greeting component says Hello in any language. Greeting uses a Translator component to translate “Hello” from English to the selected language. E.g. greeting.sayHello(“Portuguese”, “Paulo”) should return “Ola Paulo” Translator is an interface containing the translate method – parameters from, to and word, which returns the translated word; e.g. translate(“English”, “Portuguese”, “Hello”) would return “Ola”.

Sample 2 - Publisher

This is a simplistic implementation of the Publisher/Subscriber service. A Publisher can accept one subscriber - public void add(ISubscriber subscriber). When publisher.publish(message) is invoked, the message is sent to the Subscriber by invoking subscriber.receive(message). Subscriber is an interface containing the receive(message) method.

Sample 3 - Bank System

This is a subset of a sample banking application. BankSystem provides transfer capability. A transfer - transfer(account from, account to, double amount) - enables the exchange of a certain amount between two accounts.

Account provides account' operations for balance, deposit, withdraw and currency.

A withdraw operation from an Account with insufficient funds will throw InsufficientFundsException.

CurrencyService provides an operation to convert rate from different currencies.

Sample 4 – Cache

TimeBasedCache provides a cache component that caches Objects in memory based on a time based ReloadPolicy.

TimeBasedCache uses ObjectLoader to load the Objects.

Clock provides a service for getting the current time - Timestamp currentTime(). Clock provides a great example of how Mock Objects facilitates unit testing more complicated scenarios – in this case, Mock Objects are facilitating time based tests.