_handleResults = (results) => {
    if (results.length !== undefined && results.length === 0) {
        this.setState({ noRecord: true })
    }

    if (this.state.val !== '') {
        this.setState({ trainingcatalogues: results })
    } else {
        this.setState({ trainingcatalogues: this.state.traininglist })
        this.setState({ errorMessage: false })
        this.setState({ noRecord: false })
    }
}

it('handles the result', () => {
    results="passed";
    const wrapper = renderer.create(<Online />).getInstance();
    wrapper._handleResults(results);
    expect(wrapper.state.noRecord).toBe(true);
});

expect(received).toBe(expected)

Expected value to be (using ===):
  true
Received:
  false