public function testShouldUnshiftValue() { $value = 'value'; $value2 = 'value2'; $valueToUnshift = 'valueToUnshift'; $this->list->add($value); $this->assertEquals($value, $this->list->first()); $this->list->add($value2); $this->assertEquals($value, $this->list->first()); $this->list->unshift($valueToUnshift); $this->assertEquals($valueToUnshift, $this->list->first()); }