@onflow/flow-js-testing/test/basic/cadence.test.js

This package will expose a set of utility methods, to allow Cadence code testing with libraries like Jest

import registry from "../../src/generated"
const {FlowManagerTemplate} = registry.contracts

describe("manager code", () => {
  test("FlowManager contract", async () => {
    const code = await FlowManagerTemplate()

    expect(code.includes("access(all) contract FlowManager")).toBe(true)
  })
})