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

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import TabBar from "../index";
describe("TabBar", () => {
    describe("calcIndicatorWidth", () => {
        it("should equale 25%", () => {
            const uut = new TabBar({});
            uut.state = {
                widths: [80, 80, 80, 80],
                selectedIndex: 1
            };
            uut.childrenCount = 4;
            uut.contentWidth = 320;
            jest.spyOn(uut, "calcIndicatorWidth");
            expect(uut.calcIndicatorWidth()).toEqual("25%");
        });
        it("should equale 50%", () => {
            const uut = new TabBar({});
            uut.state = {
                widths: [150, 150, 300],
                selectedIndex: 2
            };
            uut.childrenCount = 2;
            uut.contentWidth = 600;
            jest.spyOn(uut, "calcIndicatorWidth");
            expect(uut.calcIndicatorWidth()).toEqual("50%");
        });
    });
});