public void GetProbabilityCoinFlipTest()
{
// Flip a coin TEST_ITERATION times. On balance, it should return
// true ("heads") %PROBABILITY of the time, + or - %MARGIN_OF_ERROR.
const Int32 TEST_ITERATIONS = 100000;
const Double MARGIN_OF_ERROR = 0.01d; // One percent.
const Double PROBABILITY = 0.38d; // # between 0 and 1 exclusive.
const Double LOWER_ACCEPTABLE_BOUND = PROBABILITY - MARGIN_OF_ERROR;
const Double UPPER_ACCEPTABLE_BOUND = PROBABILITY + MARGIN_OF_ERROR;
Int32 numberOfHeadsFlips = 0;
// Count the number of "heads" results.
for (Int32 i = 1; i <= TEST_ITERATIONS; i++)
{
numberOfHeadsFlips += (RandomRoutines.GetCoinFlip((Double)PROBABILITY) ? 1 : 0);
}
var percentOfHeadsFlips = (Double)numberOfHeadsFlips / (Double)TEST_ITERATIONS;
var success = (
(LOWER_ACCEPTABLE_BOUND < percentOfHeadsFlips) &&
(percentOfHeadsFlips < UPPER_ACCEPTABLE_BOUND));
Assert.IsTrue(
success,
String.Format("{0} out of {1} probability coin flips ({2} percent) returned true. Target was {3}% (+/- {4}%).",
numberOfHeadsFlips, TEST_ITERATIONS, percentOfHeadsFlips * 100, PROBABILITY * 100, MARGIN_OF_ERROR * 100));
}
public void GetCoinFlipTest()
{
// Flip a coin TEST_ITERATION times. On balance, it should return
// true ("heads") %50 of the time, + or - %MARGIN_OF_ERROR.
const Int32 TEST_ITERATIONS = 100000;
const Double MARGIN_OF_ERROR = 0.01d; // One percent.
const Double LOWER_ACCEPTABLE_BOUND = 0.5d - MARGIN_OF_ERROR;
const Double UPPER_ACCEPTABLE_BOUND = 0.5d + MARGIN_OF_ERROR;
Int32 numberOfHeads = 0;
for (Int32 i = 1; i <= TEST_ITERATIONS; i++)
{
numberOfHeads += (RandomRoutines.GetCoinFlip() ? 1 : 0);
}
var percentOfHeadsFlips = (Double)numberOfHeads / (Double)TEST_ITERATIONS;
var success = ((LOWER_ACCEPTABLE_BOUND < percentOfHeadsFlips) && (percentOfHeadsFlips < UPPER_ACCEPTABLE_BOUND));
Assert.IsTrue(
success,
String.Format("{0} out of {1} coin flips ({2}%) returned true. Target was 50% (+/- {3}%).",
numberOfHeads, TEST_ITERATIONS, percentOfHeadsFlips * 100, MARGIN_OF_ERROR * 100));
}