react-stable-ref
Version:
An assortment of utilities for testing against unstable references in React
67 lines • 3.02 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
Object.defineProperty(o, k2, { enumerable: true, get: function() { return m[k]; } });
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
var react_1 = __importStar(require("react"));
var react_2 = require("@testing-library/react");
var useStableRefTester_1 = __importDefault(require("./useStableRefTester"));
jest.useFakeTimers();
describe('useStableRefTester', function () {
afterEach(function () { return react_2.cleanup(); });
it('triggers a rerender every at every interval', function () {
var UnstableButton = function (_a) {
var onRender = _a.onRender, children = _a.children;
var unstableArray = ['1', '2', '3'];
useStableRefTester_1.default();
react_1.useEffect(function () {
onRender();
}, [unstableArray]);
return react_1.default.createElement("button", { type: "button" }, children);
};
var onRender = jest.fn();
react_2.render(react_1.default.createElement(UnstableButton, { onRender: onRender }, "Hello world"));
react_2.act(function () {
jest.runOnlyPendingTimers();
});
expect(onRender).toHaveBeenCalledTimes(2);
});
it('does not trigger a rerender every at every interval with a stable reference', function () {
var StableButton = function (_a) {
var onRender = _a.onRender, children = _a.children;
var unstableArray = ['1', '2', '3'];
var stableArrayHash = JSON.stringify(unstableArray);
useStableRefTester_1.default();
react_1.useEffect(function () {
onRender();
}, [stableArrayHash]);
return react_1.default.createElement("button", { type: "button" }, children);
};
var onRender = jest.fn();
react_2.render(react_1.default.createElement(StableButton, { onRender: onRender }, "Hello world"));
react_2.act(function () {
jest.runOnlyPendingTimers();
});
expect(onRender).toHaveBeenCalledTimes(1);
});
});
//# sourceMappingURL=useStableRefTester.spec.js.map