- $this->assertTrue(file_exists($file));
- $this->assertTrue($this->instance->acquire('test'));
- $this->assertTrue($this->instance->isLocked('test'));
- $this->assertTrue($this->instance->release('test'));
+ self::assertTrue(file_exists($file));
+ self::assertTrue($this->instance->acquire('test'));
+ self::assertTrue($this->instance->isLocked('test'));
+ self::assertTrue($this->instance->release('test'));