如何使用minitest计算fixtures文件中项目的ID?

我正在使用Rails 5和minitest。在我的测试文件中,我如何知道fixtures文件中某个项目的ID是什么?我有以下模式

  create_table "lines", force: :cascade do |t|
    t.string  "route_long_name"
    t.string  "name"
    t.integer "system_type"
    t.string  "color"
    t.string  "onestop_id"
    t.string  "vehicle_type"
    t.string  "wheelchair_accessible"
    t.string  "bikes_allowed"
    t.index ["onestop_id"], name: "index_lines_on_onestop_id"
    t.index ["route_long_name"], name: "index_lines_on_route_long_name"
  end

然后在我的测试/夹具/生产线中。yml,我创建了这个装置

one:
  id: "1"
  name: "line1"
  color: "green"

So in my minitest test, I try this

  test "get show page with valid line id" do
    test_line_id = "1"
    line = Line.find_by_id(test_line_id)
    puts "inspect1: #{line.inspect}"
    assert_not_nil line

    get line_url(line)
    line = assigns(:line)
    puts "inspect2 #{line.inspect}"
    assert_equal test_line_id, line.id
    assert_response :success
  end

但是那条线

 assert_equal test_line_id, line.id

模具有错误

Expected: "1"
  Actual: "980190962"

那么,如何在fixtures文件中计算出项目的ID呢?