/**
* When one RunningStat instance is merged into another, the state of the
* target RunningInstance should have the state that it would have had if
* all the data had been accumulated by it alone.
* @covers RunningStat::merge
* @covers RunningStat::count
*/
public function testRunningStatMerge()
{
$expected = new RunningStat();
foreach ($this->points as $point) {
$expected->push($point);
}
// Split the data into two sets
$sets = array_chunk($this->points, floor(count($this->points) / 2));
// Accumulate the first half into one RunningStat object
$first = new RunningStat();
foreach ($sets[0] as $point) {
$first->push($point);
}
// Accumulate the second half into another RunningStat object
$second = new RunningStat();
foreach ($sets[1] as $point) {
$second->push($point);
}
// Merge the second RunningStat object into the first
$first->merge($second);
$this->assertEquals(count($first), count($this->points));
$this->assertEquals($first, $expected);
}
