setup_jest.js

import Enzyme, { shallow, render, mount } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';
import toJson from 'enzyme-to-json';

// React 16 Enzyme adapter
Enzyme.configure({ adapter: new Adapter() });

// Make Enzyme functions available in all test files without importing
global.shallow = shallow;
global.render = render;
global.mount = mount;
global.toJson = toJson;

global.window.require = function() {
    return {
        ipcRenderer: {
            send: function() {
                // Fake sending message to ipcMain
            },
            on: function() {
                // Fake receiving message to ipcMain
            }
        },
        webFrame: {
            setZoomLevelLimits: function() {},
            setVisualZoomLevelLimits: function() {}
        },
        remote: {
            require: function() {
                return {
                    dirToJson: function() {
                        return new Promise((res, rej) => {});
                    },
                    getDefaultLocation: function() {},
                    selectDirectory: function() {
                        return new Promise((res, rej) => {});
                    },
                    checkUpdate: function(_old, _new) {},
                    warn: function() {},
                    isMac: function() {},
                    isWin: function() {}
                };
            },
            getGlobal: function() {
                return {
                    setConfig: function() {},
                    getConfig: function() {},
                    dictConfig: function() {},
                    configStore: {
                        onDidChange: function() {}
                    },
                    env: {
                        NODE_ENV: function() {}
                    }
                };
            },
            dialog: {
                showOpenDialog: function() {}
            },
            BrowserWindow: function() {},
            app: {
                getVersion: function() {}
            },
            process: {
                argv: {
                    includes: function() {}
                }
            }
        }
    };
};

global.window.electron = {
    remote: {
        process: {
            argv: {
                includes: function() {}
            }
        },
        require: function() {
            return {
                dirToJson: function() {
                    return new Promise((res, rej) => {});
                },
                getDefaultLocation: function() {},
                selectDirectory: function() {
                    return new Promise((res, rej) => {});
                },
                checkUpdate: function(_old, _new) {},
                warn: function() {},
                isMac: function() {},
                isWin: function() {}
            };
        },
        getGlobal: function() {
            return {
                setConfig: function() {},
                getConfig: function() {},
                dictConfig: function() {},
                configStore: {
                    onDidChange: function() {}
                }
            };
        },
        dialog: {
            showOpenDialog: function() {}
        },
        app: {
            getVersion: function() {}
        },
        BrowserWindow: function() {}
    },
    ipcRenderer: {
        send: function() {
            // Fake sending message to ipcMain
        },
        on: function() {
            // Fake receiving message to ipcMain
        }
    },
    clipboard: {
        writeText: function() {}
    },
    webFrame: {
        setZoomLevelLimits: function() {},
        setVisualZoomLevelLimits: function() {}
    }
};
// Skip createElement warnings but fail tests on any other warning
/*console.error = message => {
    if (!/(React.createElement: type should not be null)/.test(message)) {
        throw new Error(message);
    }
};*/