public function testKeys()
{
// from js
$this->assertEquals(array('one', 'two'), __u::keys((object) array('one' => 1, 'two' => 2)), 'can extract the keys from an object');
$a = array(1 => 0);
$this->assertEquals(array(1), __u::keys($a), 'is not fooled by sparse arrays');
$actual = 'underscore';
try {
$actual = __u::keys(null);
} catch (Exception $e) {
}
$this->assertEquals('underscore', $actual, 'throws an exception for null values');
$actual = 'underscore';
try {
$actual = __u::keys(UNDERSCORE_FOO);
} catch (Exception $e) {
}
$this->assertEquals('underscore', $actual, 'throws an exception for undefined values');
$actual = 'underscore';
try {
$actual = __u::keys(1);
} catch (Exception $e) {
}
$this->assertEquals('underscore', $actual, 'throws an exception for number primitives');
$actual = 'underscore';
try {
$actual = __u::keys('a');
} catch (Exception $e) {
}
$this->assertEquals('underscore', $actual, 'throws an exception for string primitives');
$actual = 'underscore';
try {
$actual = __u::keys(true);
} catch (Exception $e) {
}
$this->assertEquals('underscore', $actual, 'throws an exception for boolean primitives');
// extra
$this->assertEquals(array('one', 'two'), __u::keys(array('one' => 1, 'two' => 2)), 'can extract the keys from an array');
$this->assertEquals(array('three', 'four'), __u(array('three' => 3, 'four' => 4))->keys(), 'can extract the keys from an array using OO-style call');
// docs
$this->assertEquals(array('name', 'age'), __u::keys((object) array('name' => 'moe', 'age' => 40)));
}