test_save_record.swift

func testSaveRecord() {
    let record = PFARecord()
    record.title = "Unexpected expense"
    record.price = 1.0

    let category = PFACategory()
    category.title = "A category"
    record.category = category

    do {
        try self.storage?.save(object: record)
    } catch _ as NSError {
        XCTFail("Impossible to save the current record")
    }
}