public function getNumTestedFunctions()
{
if ($this->numTestedFunctions === null) {
$this->numTestedFunctions = 0;
foreach ($this->functions as $function) {
if ($function['executableLines'] > 0 && $function['coverage'] == 100) {
$this->numTestedFunctions++;
}
}
}
return $this->numTestedFunctions;
}