public function testFilter()
{
$records = [1, false, null, ''];
$collection = new Collection($records);
$this->expectsException(function () use($collection) {
$collection->filter('exception');
}, Exception::class, null, Exception::INVALID_CALLBACK);
// default behaviour: filter returns a new Collection
$filtered = $collection->filter();
$this->assertInstanceOf(Collection::class, $filtered);
$this->assertSame($collection, $filtered);
$this->assertEquals([1], $filtered->getArrayCopy());
// alternative: it returns self
$filtered = $collection->copy()->filter();
$this->assertInstanceOf(Collection::class, $filtered);
$this->assertNotSame($collection, $filtered);
$this->assertEquals([1], $filtered->getArrayCopy());
// other scenarii
$records = [1, 'test', 'test', ''];
$collection = new Collection($records);
$filtered = $collection->filter(function () {
return false;
});
$this->assertInstanceOf(Collection::class, $filtered);
$this->assertSame($collection, $filtered);
$this->assertEquals([], $filtered->getArrayCopy());
$filtered = $collection->filter(function () {
return false;
}, true);
$this->assertSame($collection, $filtered);
$this->assertEquals([], $filtered->getArrayCopy());
}
