react-native-web-internals/dist/esm/modules/useStable/__tests__/index-test.native.js

React Native for Web

import { jsx as _jsx } from "react/jsx-runtime";
import "react";
import * as ReactDOM from "react-dom";
import { act } from "react-dom/test-utils";
import useStable from "../index.native.js";
function createRoot(rootNode) {
  return {
    render(element) {
      ReactDOM.render(element, rootNode);
    }
  };
}
describe("useStable", function () {
  var root,
    rootNode,
    spy = {},
    TestComponent = function (param) {
      var {
          initialValueCallback
        } = param,
        value = useStable(initialValueCallback);
      return spy.value = value, null;
    };
  beforeEach(function () {
    spy = {}, rootNode = document.createElement("div"), document.body.appendChild(rootNode), root = createRoot(rootNode);
  }), afterEach(function () {
    root.render(null), document.body.removeChild(rootNode), rootNode = null, root = null;
  }), test("correctly sets the initial value", function () {
    var initialValueCallback = function () {
      return 5;
    };
    act(function () {
      root.render(/* @__PURE__ */_jsx(TestComponent, {
        initialValueCallback
      }));
    }), expect(spy.value).toBe(5);
  }), test("does not change the value", function () {
    var counter = 0,
      initialValueCallback = function () {
        return counter++;
      };
    act(function () {
      root.render(/* @__PURE__ */_jsx(TestComponent, {
        initialValueCallback
      }));
    }), expect(spy.value).toBe(0), act(function () {
      root.render(/* @__PURE__ */_jsx(TestComponent, {
        initialValueCallback
      }));
    }), expect(spy.value).toBe(0);
  }), test("only calls the callback once", function () {
    var counter = 0,
      initialValueCallback = function () {
        return counter++;
      };
    act(function () {
      root.render(/* @__PURE__ */_jsx(TestComponent, {
        initialValueCallback
      }));
    }), expect(counter).toBe(1), act(function () {
      root.render(/* @__PURE__ */_jsx(TestComponent, {
        initialValueCallback
      }));
    }), expect(counter).toBe(1);
  }), test("does not change the value if the callback initially returns null", function () {
    var counter = 0,
      initialValueCallback = function () {
        return counter === 0 ? (counter++, null) : counter++;
      };
    act(function () {
      root.render(/* @__PURE__ */_jsx(TestComponent, {
        initialValueCallback
      }));
    }), expect(spy.value).toBe(null), act(function () {
      root.render(/* @__PURE__ */_jsx(TestComponent, {
        initialValueCallback
      }));
    }), expect(spy.value).toBe(null);
  });
});
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