Scalatest is a free, opensource testing toolkit for scala and java programmers. For regular scala projects, use the project structure dialog, to configure the test library the use ui with sbt option that displays the test results in the same format as for platform test runner is not available test scopes in scala. For example 0 for an intinteger and false for a booleanboolean. I am current doing something similar to the following. This allows you to run junit tests from sbt unlike scala testing frameworks like scalatest which can also run junit test cases, both junit and this adapter are pure java, so you can run junit tests with any scala version supported by sbt without having to build a binarycompatible test framework first. Here i share steps i took to enable scala application testing using junit.
First, make sure you have the java 8 jdk or java 11 jdk installed. Testcase a junit3suite may be run by either junit 3 such as junit 3. However, some tools that integrate with junit carry on this distinction, so even if you are using junit 4 you may want to use this assertionsforjunit trait instead of plainold scalatest assertions. Trait junitsuite already mixes in assertionsforjunit. Create a proxy java class in the intellij java srcjava directory structure as presented by the image listing 01 below called testproxy. Junit runner is not our feature, we just try to show for junit plugin that scala class is test class should be considered as hack. Junit is a unit testing framework for java, created by erich gamma and kent beck. You will now need to tell intellij where to find the java 8 jdk as well as scala.
Ill try your case and fix it if it really should work. To use scalatest in your scala project, you must download scalatest and. If you run intellij idea for the first time, you can install the scala plugin when intellij idea suggests downloading featured plugins. If you compile this class with the scala compiler, junit will happily run the resulting class file. If using the buildmvn package zinc will automatically be downloaded and leveraged for all. Pragmatic unit testing in java with junit 2003 by andy hunt, dave. To run a test suite using junit in scala ide, open the source file of the test, rightclick in it, and select run as junit test.
Junit junit is a unit testing framework for java, created by erich gamma and kent beck. How to download and install junit in eclipse guru99. For the latest information, downloads, and opportunities to contribute, please visit. If you interested in using scala s bdd framework specs with scala 2. These two actions will cause sbt to download the scalatest library. Practical methods for programmer testing 2004 by j b rainsberger. To start working with scala in intellij idea you need to download and enable the scala plugin. If you dont have it installed, download java from oracle java 8, oracle java 11, or adoptopenjdk 811. Starts the scala repl with project classes and dependencies on the classpath modularization supported with subprojects. To demonstrate this, first create a new test class named toppingtests. Funsuite class einfachertest extends funsuite testthe word test has length 4 asserttest. You can rerun your test using the launch configuration which is automatically created. This video is part of a series of learning support material for introduction to the art of programming. Now with a shiny scala debugger, semantic highlight, more reliable junit test finder, an ecosystem of related plugins, and much more.
Junit 4 dropped the distinction between failures and errors, so you can just use scalatests plain old assertions and matchers traits. Thus it is best to explicitly state the unit result type, like this. There are multiple libraries and testing methodologies for scala, but in this tutorial, well demonstrate one popular option from the scalatest framework called funsuite. For example, if you have created a junit folder in c. Not only does this plugin give scala programmers the level of testframeworkide integration that java programmers have enjoyed with junit, it goes quite a bit farther. Replace the pom files content with the following code.
This video looks at how we can use junit to construct unit tests of our array based stack. To use this trait in a junit 3 testcase, you can mix it into your testcase class, like this. You manage fixtures with methods setup and teardown. By default, for all methods that return a value, a mock will return either null, a primitiveprimitive wrapper value, or an empty collection, as appropriate. For eclipse users, scalatest offers a powerful plugin that provides seamless support for testing in the scala ide for eclipse. By offering deep integration with tools such as junit, testng, ant, maven, sbt. This assumes you know how to build a project in intellij. Fixes the compiler errors that sometimes occurred when using overloaded methods that use varargs like doreturn. Scalatest is an extensive behaviordriven development bdd suite with numerous builtin specs, but it also intergrates with some of the classic testing frameworks like junit and testng.
This includes focusing on java 8 and above, as well as enabling many different styles of testing. Get project updates, sponsored content from our select partners, and more. The junit 5 testing framework was released on september 10. Release notes log in required the complete history of changes to the scala. When writing junit 3 tests in scala, you should keep in mind that junit 3 will not run tests that have a return type other than unit. Junit in action, second edition 2010 by petar tahchiev, felipe leme, vincent massol, gary gregory. Tests are methods that start with test, take no parameters, and have a unit return type. However, intellij idea has had support for junit 5 for quite some time, and the latest version, 2017. Testing scala in intellij with scalatest scala documentation.
Beyond running a single, simple junit test class, you can also create additional test classes, and then a testsuite. Unit testing spark and scala using scalatest presented at bangalore apache spark meetup by ganesha yadiyala on 02092017. Setting up intellij idea for creating and testing scala. That is another use case for scalatest, similar to the junit 3 one. After the installation, intellij idea will keep track. It will give you suboptions for scala, sbt, and activator. However, intellij idea has had support for junit 5 for quite some time, and the latest v2017. Supports mixed scala java projects supports testing with scalacheck, specs, and scalatest. Mockito from the java version, but it provides a more scala like syntax, mainly. One way scalatest scales down is that despite its rich feature set, scalatest is easy. Junit 5 is the result of junit lambda and its crowdfunding campaign on indiegogo. Junit in action 2003 by vincent massol, ted husted.
To actually create a project and build scala code, you should follow the directions on the next page. You can use either junit s assertions, inherited from testcase, or scalatests, inherited from assertionsforjunit. Refer jdk compatibility for scala java compatiblity detail. Well be using the scala maven plugin github repo, website formerly known as the maven scala plugin. The following features are available for free with intellij idea community edition. How to set an expected exception using scala and junit 4. We recommend following the directions on the same pages linked to on the scala download page. I want to set an expected exception for a junit 4 test using scala. Otherwise, you can use the plugins page for the installation. The goal is to create an uptodate foundation for developerside testing on the jvm.