# -*- coding: utf-8 -*-
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import Select
from selenium.common.exceptions import NoSuchElementException
from selenium.common.exceptions import NoAlertPresentException
import unittest, time, re

class Untitled(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Firefox()
        self.driver.implicitly_wait(30)
        self.base_url = "https://ya.ru/"
        self.verificationErrors = []
        self.accept_next_alert = True

    def test_untitled(self):
        driver = self.driver
        driver.get(self.base_url + "/")
        driver.find_element_by_id("text").click()
        driver.find_element_by_id("text").clear()
        driver.find_element_by_id("text").send_keys(u"голый петросян")
        driver.find_element_by_xpath("//button[@type='submit']").click()

    def is_element_present(self, how, what):
        try:
            self.driver.find_element(by=how, value=what)
        except NoSuchElementException, e: return False
        return True

    def is_alert_present(self):
        try:
            self.driver.switch_to_alert()
        except NoAlertPresentException, e: return False
        return True

    def close_alert_and_get_its_text(self):
        try:
            alert = self.driver.switch_to_alert()
            alert_text = alert.text
            if self.accept_next_alert:
                alert.accept()
            else:
                alert.dismiss()
            return alert_text
        finally:
            self.accept_next_alert = True

    def tearDown(self):
        self.driver.quit()
        self.assertEqual([], self.verificationErrors)

if __name__ == "__main__":
    unittest.main()

# -*- coding: utf-8 -*-
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import Select
from selenium.common.exceptions import NoSuchElementException
from selenium.common.exceptions import NoAlertPresentException
import unittest, time, re

class Untitled(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Remote('http://192.168.154.144:4444/wd/hub', webdriver.DesiredCapabilities.FIREFOX)
        self.driver.implicitly_wait(30)
        self.base_url = "https://ya.ru/"
        self.verificationErrors = []
        self.accept_next_alert = True

    def test_untitled(self):
        driver = self.driver
        driver.get(self.base_url + "/")
        driver.find_element_by_id("text").click()
        driver.find_element_by_id("text").clear()
        driver.find_element_by_id("text").send_keys(u"голый петросян")
        driver.find_element_by_xpath("//button[@type='submit']").click()

    def is_element_present(self, how, what):
        try:
            self.driver.find_element(by=how, value=what)
        except NoSuchElementException, e: return False
        return True

    def is_alert_present(self):
        try:
            self.driver.switch_to_alert()
        except NoAlertPresentException, e: return False
        return True

    def close_alert_and_get_its_text(self):
        try:
            alert = self.driver.switch_to_alert()
            alert_text = alert.text
            if self.accept_next_alert:
                alert.accept()
            else:
                alert.dismiss()
            return alert_text
        finally:
            self.accept_next_alert = True

    def tearDown(self):
        self.driver.quit()
        self.assertEqual([], self.verificationErrors)

if __name__ == "__main__":
    unittest.main()

Update test_case.py