budibase/packages/builder/tests/buildCodeForScreen.spec.js

import { buildCodeForScreens } from "../src/builderStore/buildCodeForScreens";

describe("buildCodeForScreen",() => {

  it("should package _code into runnable function, for simple screen props", () => {
    const screen = {
      props: {
        _id: "1234",
        _code: "render('render argument');"
      }
    }

    let renderArg;
    const render = (arg) => {
      renderArg = arg;
    }
    const uiFunctions = getFunctions(screen);
    
    const targetfunction = uiFunctions[screen.props._id];
    expect(targetfunction).toBeDefined();

    targetfunction(render);

    expect(renderArg).toBe("render argument");

  });

  it("should package _code into runnable function, for _children ", () => {
    const screen = {
      props: {
        _id: "parent",
        _code: "render('parent argument');",
        _children: [
            {
                _id: "child1",
                _code: "render('child 1 argument');"
            },
            {
                _id: "child2",
                _code: "render('child 2 argument');"
            }
        ]
      }
    }

    let renderArg;
    const render = (arg) => {
      renderArg = arg;
    }
    const uiFunctions = getFunctions(screen);
    
    const targetfunction = uiFunctions["child2"];
    expect(targetfunction).toBeDefined();

    targetfunction(render);

    expect(renderArg).toBe("child 2 argument");

  })

});

const getFunctions = (screen) => 
    new Function(buildCodeForScreens([screen]))();