/**
* Test that the generator only returns results in the specified range.
*
* @covers \DrupalReleaseDate\NumberGenerator\QuadraticWeighted<extended>
*/
function testRange()
{
$min = 2;
$max = 15;
$probabilitySum = $this->calculateProbabilitySum($min, $max);
$generator = new QuadraticWeighted($this->weightGeneratorStub, $min, $max);
$this->weightGeneratorStub->method('generate')->will($this->onConsecutiveCalls(-1, 0, 1, $probabilitySum / 2, $probabilitySum - 1, $probabilitySum, $probabilitySum + 1));
for ($i = 0; $i < 7; $i++) {
$rand = $generator->generate();
$this->assertGreaterThanOrEqual($min, $rand);
$this->assertLessThanOrEqual($max, $rand);
}
}
/**
* Check that the distribution of results from a generator is accurate
* within its range.
*
* The generator under test must use a Cyclic generator for its weights.
*
* @param NumberGeneratorInterface $generator
* @param int $min
* @param int $max
* @param int|float $slope
* @param int|float $base
* @param int|float $step
*/
protected function checkDistribution(NumberGeneratorInterface $generator, $min, $max, $slope = 1, $base = 1, $step = 1)
{
$probabilitySum = $this->calculateProbabilitySum($min, $max, $slope, $base);
$results = array_fill($min, $max - $min + 1, 0);
for ($i = 0; $i < $probabilitySum * 10 / $step; $i++) {
$results[$generator->generate()]++;
}
foreach ($results as $value => $count) {
$this->assertEquals(($slope * ($value - $min) + $base) * 10 / $step, $count);
}
}
