Test case doesn't pass in Circle CI

[oLeVanNghia]

I write below codes.

database.yml

test: &test
  <<: *default
  host: 127.0.0.1
  database: test_db

test_reader:
  <<: *test
  host: localhost

TestModel

class TestModel < ActiveRecord::Base
  use_switch_point :common
end

require "rails_helper"

RSpec.describe TestModel, :use_transaction do
  it "test switch point" do
    SwitchPoint.with_readonly do
      expect(TestModel.connection.pool.spec.config[:host]).to eq("localhost")
    end
  end
end

This test case passed in local but failed in Circle CI.
Can anyone help me?