To test a random return value function.

Posted on 2011-09-20
Last Modified: 2012-06-27
I want to unit test a function which is returning a random value from an array-list . I want to check whether the function is returning a random value or not .
Question by:sriramvemaraju2000
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Expert Comment

ID: 36571274
LVL 47

Expert Comment

ID: 36571294

these are some useful  discussions on this subject and even applet , but no code is provided

Author Comment

ID: 36571336
Thanks for your help.
LVL 47

Expert Comment

ID: 36571346
You are welcome.
For some reason I cannot find any java source code for testing of random generator;
I'm sure it  should be avaialable

This is code in C:


Accepted Solution

reijnemans earned 500 total points
ID: 36571966

TestNG gives some features that may be usefull for testing the random generator:

	private static List<Integer> randomResults = new ArrayList<Integer>(); 
	@Test(invocationCount=100, successPercentage=50)
	public void TestRandom() {
		Integer randomResult = random();
		if (randomResults.contains(randomResult)) {"result is returned before " + randomResult);
	public Integer random () {
		Double r1 = Math.random();
		Double r2 = r1 * 100; 
		return r2.intValue();

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pay attention add the @Test

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