How to use the gemini-core.SetsBuilder function in gemini-core

        beforeEach(() => createSetsBuilder = sandbox.spy(SetsBuilder, 'create'));

beforeEach(() => {
        sandbox.spy(SetsBuilder, 'create');
        sandbox.stub(SetsBuilder.prototype, 'useFiles').returnsThis();
        sandbox.stub(SetsBuilder.prototype, 'useSets').returnsThis();
        sandbox.stub(SetsBuilder.prototype, 'useBrowsers').returnsThis();

        sandbox.stub(SetsBuilder.prototype, 'build').resolves({groupByBrowser: () => ({})});

        sandbox.stub(TestParser, 'prepare');
        sandbox.spy(TestParser, 'create');
        sandbox.stub(TestParser.prototype, 'applySkip').returnsThis();
        sandbox.stub(TestParser.prototype, 'applyConfigController').returnsThis();
        sandbox.stub(TestParser.prototype, 'applyGrep').returnsThis();
        sandbox.stub(TestParser.prototype, 'loadFiles').returnsThis();
        sandbox.stub(TestParser.prototype, 'parse');

        sandbox.spy(TestSkipper, 'create');
    });