Test if the help text is available on the add effect form.
function testAddEffectHelpText() {
// Create a random image style.
$style = $this
->createRandomStyle();
// Open the add effect form and check for the help text.
$this
->drupalGet($style['path'] . '/add/image_crop');
$this
->assertText(t('Cropping will remove portions of an image to make it the specified dimensions.'), 'The image style effect help text was displayed on the add effect page.');
}