4d23c15a6a
There is nothing about the class that mandates it be used exclusively for profiling, or exclusively within the context of MediaWiki. The functionality it provides is generic. So move it to libs/ to make it easier to discover & reuse. Change-Id: Iac8f2f8e1c3231ebe76318d72cf6225e25a7b891
81 lines
2.4 KiB
PHP
81 lines
2.4 KiB
PHP
<?php
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/**
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* PHP Unit tests for RunningStat class.
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* @covers RunningStat
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*/
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class RunningStatTest extends MediaWikiTestCase {
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public $points = array(
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49.7168, 74.3804, 7.0115, 96.5769, 34.9458,
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36.9947, 33.8926, 89.0774, 23.7745, 73.5154,
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86.1322, 53.2124, 16.2046, 73.5130, 10.4209,
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42.7299, 49.3330, 47.0215, 34.9950, 18.2914,
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);
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/**
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* Verify that the statistical moments and extrema computed by RunningStat
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* match expected values.
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* @covers RunningStat::push
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* @covers RunningStat::count
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* @covers RunningStat::getMean
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* @covers RunningStat::getVariance
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* @covers RunningStat::getStdDev
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*/
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public function testRunningStatAccuracy() {
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$rstat = new RunningStat();
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foreach( $this->points as $point ) {
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$rstat->push( $point );
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}
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$mean = array_sum( $this->points ) / count( $this->points );
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$variance = array_sum( array_map( function ( $x ) use ( $mean ) {
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return pow( $mean - $x, 2 );
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}, $this->points ) ) / ( count( $rstat ) - 1 );
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$stddev = sqrt( $variance );
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$min = min( $this->points );
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$max = max( $this->points );
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$this->assertEquals( count( $rstat ), count( $this->points ) );
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$this->assertEquals( $rstat->min, min( $this->points ) );
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$this->assertEquals( $rstat->max, max( $this->points ) );
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$this->assertEquals( $rstat->getMean(), $mean );
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$this->assertEquals( $rstat->getVariance(), $variance );
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$this->assertEquals( $rstat->getStdDev(), $stddev );
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}
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/**
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* When one RunningStat instance is merged into another, the state of the
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* target RunningInstance should have the state that it would have had if
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* all the data had been accumulated by it alone.
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* @covers RunningStat::merge
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* @covers RunningStat::count
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*/
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public function testRunningStatMerge() {
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$expected = new RunningStat();
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foreach( $this->points as $point ) {
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$expected->push( $point );
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}
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// Split the data into two sets
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$sets = array_chunk( $this->points, floor( count( $this->points ) / 2 ) );
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// Accumulate the first half into one RunningStat object
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$first = new RunningStat();
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foreach( $sets[0] as $point ) {
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$first->push( $point );
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}
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// Accumulate the second half into another RunningStat object
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$second = new RunningStat();
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foreach( $sets[1] as $point ) {
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$second->push( $point );
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}
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// Merge the second RunningStat object into the first
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$first->merge( $second );
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$this->assertEquals( count( $first ), count( $this->points ) );
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$this->assertEquals( $first, $expected );
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}
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}
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