Building Java file at runtime & running JUnit test on that class file

Question

I am trying to build a Dynamic web project where user can practice Java code.

I got success on writing the code written by user in a .java file, compile the code & get error messages using Java Compile API.

Now, I need to run JUnit 1.4 Compatible test on that code.

I researched for it, and found something like parameterized junit testing. But my view on how should it be done isn't still clear.

UPDATE

This (http://codingbat.com/prob/p171896) is the exact thing what I'm trying to implement.

The first publicly-available version of JUnit was 3.7. Maybe you mean "JUnit4 Compatible", which was a big version change over the previous JUnit3, or "JUnit for Java 1.4", which this question defines nicely? — Jeff Bowman
– Jeff Bowman, Commented Sep 8, 2014 at 23:48
@JeffBowman thanx for noticing the question. Its actually "JUnit for Java 1.4". I know the JUnit testing, and had been using it for my projects. But in this project. I need to test the class file at runtime, which is written by the user. There comes my problem. — TheManish
– TheManish, Commented Sep 9, 2014 at 4:48

Marcel Bochtler · Accepted Answer · 2016-10-25 18:08:35Z

2

I solved this problem with the following steps:

Compile the JUnit TestClass and the ClassToTest

JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
int compilerResult = compiler.run(null, null, null,"/path/to/TestClass.java", "/path/to/ClassToTest.java");
System.out.println("Compiler result code: " + compilerResult);

Load the compiled classes into the classloader

File dir = new File("/path/to/class/files/");
URL url = dir.toURI().toURL();
URL[] urls = {url};
ClassLoader classLoader = new URLClassLoader(urls);

Run the tests (make sure that you add junit as a dependency of your project)

Class<?> junitTest = Class.forName("TestClass", true, classLoader);
Result result = junit.run(junitTest);

Edit: If you're not needing the JUnit tests to be dynamic you can skip the compilation of those tests and add them here: junit.run(JunitTest.class)

edited Oct 25, 2016 at 18:08

answered Oct 25, 2016 at 16:53

Marcel Bochtler

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