Dropdown unit tests should cover the actions of the triggerButton

[mnajdova]

Feature Request

Problem description

We need unit test for the Dropdown that will check the correct behavior of the triggerButton (clicking on it should open the Dropdown). There was an issue in a recent PR #1299 that broke this, but the unit tests didn't caught this.

[silviuaavram]

    it('is "true" when opened by trigger button click', () => {
      const { getItems, clickOnTriggerButton } = renderDropdown()

      clickOnTriggerButton()

      expect(getItems()).toHaveLength(items.length)
    })

    it('is "false" when closed by trigger button click', () => {
      const { clickOnTriggerButton, getItems } = renderDropdown({
        defaultOpen: true,
      })

      clickOnTriggerButton()

      expect(getItems()).toHaveLength(0)
    })

We have such tests. We can close this.