protected function createFixtures(array $fixtures)
{
// normalize fixture configurations
$config = [];
// configuration provided in test case
$aliases = [];
// class name => alias or class name
foreach ($fixtures as $name => $fixture) {
if (!is_array($fixture)) {
$class = ltrim($fixture, '\\');
$fixtures[$name] = ['class' => $class];
$aliases[$class] = is_int($name) ? $class : $name;
} elseif (isset($fixture['class'])) {
$class = ltrim($fixture['class'], '\\');
$config[$class] = $fixture;
$aliases[$class] = $name;
} else {
throw new InvalidConfigException("You must specify 'class' for the fixture '{$name}'.");
}
}
// create fixture instances
$instances = [];
$stack = array_reverse($fixtures);
while (($fixture = array_pop($stack)) !== null) {
if ($fixture instanceof Fixture) {
$class = get_class($fixture);
$name = isset($aliases[$class]) ? $aliases[$class] : $class;
unset($instances[$name]);
// unset so that the fixture is added to the last in the next line
$instances[$name] = $fixture;
} else {
$class = ltrim($fixture['class'], '\\');
$name = isset($aliases[$class]) ? $aliases[$class] : $class;
if (!isset($instances[$name])) {
$instances[$name] = false;
$stack[] = $fixture = Yii::createObject($fixture);
foreach ($fixture->depends as $dep) {
// need to use the configuration provided in test case
$stack[] = isset($config[$dep]) ? $config[$dep] : ['class' => $dep];
}
} elseif ($instances[$name] === false) {
throw new InvalidConfigException("A circular dependency is detected for fixture '{$class}'.");
}
}
}
return $instances;
}