react-native-ui-lib/typings/components/connectionStatusBar/__tests__/index.spec.js

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import _ from "lodash";
import ConnectionStatusBar from "../index";
describe("ConnectionStatusBar", () => {
    let uut;
    beforeEach(() => {
        uut = new ConnectionStatusBar({});
        ConnectionStatusBar.unregisterGlobalOnConnectionLost();
    });
    describe("registerGlobalOnConnectionLost", () => {
        it("should register a callback for when connection is lost", () => {
            const callback = jest.fn();
            expect(ConnectionStatusBar.onConnectionLost).toBe(undefined);
            ConnectionStatusBar.registerGlobalOnConnectionLost(callback);
            expect(ConnectionStatusBar.onConnectionLost).toBe(callback);
            ConnectionStatusBar.unregisterGlobalOnConnectionLost();
            expect(ConnectionStatusBar.onConnectionLost).toBe(undefined);
        });
        it("should call onConnectionLost callback when connection state changed from connected to disconnected", () => {
            const callback = jest.fn();
            ConnectionStatusBar.registerGlobalOnConnectionLost(callback);
            _.set(uut, "state.isConnected", true);
            uut.onConnectionChange({ type: "none" });
            expect(callback).toHaveBeenCalled();
        });
        it("should not call onConnectionLost callback when connection state changed from disconnected to connected", () => {
            const callback = jest.fn();
            ConnectionStatusBar.registerGlobalOnConnectionLost(callback);
            _.set(uut, "state.isConnected", false);
            uut.onConnectionChange({ type: "wifi" });
            expect(callback).not.toHaveBeenCalled();
        });
    });
});