driver.get("http://somefakewebsite.com")
.then(function(){ driver.findElement(By.id("login")).sendKeys("myLogin") })
.then(function(){ driver.findElement(By.id("password").sendKeys("myPassword") })
.then(function(){ driver.findElement(By.id("submit").click() })

function inputLogin(driver){
    driver.findElement(By.id("login")).sendKeys("myLogin");
}

function inputPassword(driver){
    driver.findElement(By.id("password")).sendKeys("myPassword");
}

function clickSubmit(driver){
    driver.findElement(By.id("submit")).click();
}

driver.get("http://somefakewebsite.com")
.then(inputLogin(driver))
.then(inputPassword(driver))
.then(clickSubmit(driver))