/**
  * @dataProvider unsetRelationProvider
  */
 public function testUnsetRelationBelongsTo($value)
 {
     $book = new Book($this->conn, ['id' => 3]);
     $details = new BookDetails($this->conn, ['books_id' => 5]);
     $details->associateRelation('book', $book);
     $this->assertSame(3, $details->books_id);
     $this->assertSame($book, $details->book);
     $details->unsetRelation('book', $value);
     $this->assertSame($value, $details->books_id);
     $this->assertFalse($details->book);
 }