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I am looking for a Java tool that would create anonymous variables (variables whose value I don't care about) in my tests, similar to AutoFixture in .Net. Here is a link to AutoFixture's readme , which has pretty good examples of what it does. Here is a short example taken from the same readme: [TestMethod] public void IntroductoryTest() { // Fixture setup Fixture fixture = new Fixture(); int expectedNumber = fixture.CreateAnonymous<int>(); MyClass sut = fixture.CreateAnonymous<MyClass>(); // Exercise system int result = sut.Echo(expectedNumber); // Verify outcome Assert.AreEqual<int>(expectedNumber, result, "Echo"); // Teardown } Is there such a tool in the Java world? Edit: I tried QuickCheck and while it managed to do something like what I was looking for: import net.java.quickcheck.Generator; import net.java.quickcheck.generator.PrimitiveGenerators; import net.java.quickcheck.generator.support.ObjectGeneratorImpl; public class Main { interface Test{ String getTestValue(); } public static void main(String[] args) { Generator<String> stringGen = PrimitiveGenerators.strings(5, 100); Generator<Integer> intGen = PrimitiveGenerators.integers(5, 20); ObjectGeneratorImpl<Test> g = new ObjectGeneratorImpl<>(Test.class); g.on(g.getRecorder().getTestValue()).returns(stringGen); for (int i = 0; i < intGen.next(); i++) { System.out.println("value of testValue is: " + g.next().getTestValue()); } } } The tool seems to work only with interfaces. If I change Test to be a class and the method to a field, the generator throws an exception that only interfaces are

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