describe('backspace', function() {
    it('types some stuff and backspaces one character', function() {
        element(by.model('invoice.customerName')).sendKeys('Ali Khoda');

        element(by.model('invoice.customerName')).sendKeys(protractor.Key.BACK_SPACE);

        expect(element(by.model('invoice.customerName')).getText()).toBe('Ali Khod');

    });
});