Selenium Error: no display specified
firefox, selenium, testing
Solution
You receive this error, because you have not set the `DISPLAY` variable. Here is a guide how to perform the test on a headless machine.
You have to install Xvfb and a browser first:
apt-get install xvfb
apt-get install firefox-mozilla-build
then start Xvfb:
Xvfb &
set `DISPLAY` and start Selenium:
export DISPLAY=localhost:0.0
java -jar selenium-server-standalone-2.44.0.jar
and then you will be able to run your tests.
Problem
I've installed selenium-server-standalone-2.42.2.jar in a debian virtual box and installed Firefox 29.0 and trying to run the following script with phpunit which is the only file in the directory: ``` <?php class TestLogin extends PHPUnit_Extensions_Selenium2TestCase{ public function setUp() { $this->setHost('localhost'); $this->setPort(4444); $this->setBrowser('firefox'); $this->setBrowserUrl('http://debian-vm/phpUnitTutorial'); } public function testHasLoginForm() { $this->url('index.php'); $username = $this->byName('username'); $password = $this->byName('password'); $this->assertEquals('', $username->value()); $this->assertEquals('', $password->value()); } } ``` I get the following error: ``` 1) TestLogin::testHasLoginForm PHPUnit_Extensions_Selenium2TestCase_WebDriverException: Unable to connect to host 127.0.0.1 on port 7055 after 45000 ms. Firefox console output: Error: no display specified Error: no display specified ``` What does this mean? I've red several threads and apparently I had to do the following which I tried: 1)to type this in the command shell ``` export PATH=:0; ``` Result: I got the same error. 2) I've installed vnc4server and getting debian-vm:1 as a application I then set `export PATH=debian-vm:1` run it with realvnc and in the viewer (which works) I got the same problem.