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To test a random return value function.

Posted on 2011-09-20
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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 .
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Question by:sriramvemaraju2000
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LVL 47

Expert Comment

by:for_yan
ID: 36571274
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LVL 47

Expert Comment

by:for_yan
ID: 36571294

these are some useful  discussions on this subject and even applet , but no code is provided
http://sprng.fsu.edu/Version2.0/test-suite.html
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by:sriramvemaraju2000
ID: 36571336
Thanks for your help.
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LVL 47

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by:for_yan
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:

http://www.fourmilab.ch/random/random.zip

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Accepted Solution

by:
reijnemans earned 2000 total points
ID: 36571966
Hi,

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)) {
			Assert.fail("result is returned before " + randomResult);
		} 
		System.out.println(randomResult);
		randomResults.add(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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