Use PageObjects pattern Be fluent with - return this, varargs, generics, - reuse your model and jodatime Be robust and portable - Prefered selector order : id > name > css > xpath - Avoid Thread.sleep prefer Wait or FluentWait - Use relative URLs - Don't rely on specific Driver implementation - Create your dataset Know your new tool - Keep up to date (versions and usage pattern) - Troubleshooting - jre 1.6 - IE (zoom, Protected mode setting ) - Firefox/firebug startpage - How to deal with UI components like... fileupload, datepicker, ajaxtables,... - Detect when selenium isn't the good tool for the job - Don't be afraid to hack around selenium
Use PageObjects pattern
Page Object is a Design Pattern which has become popular in test automation for enhancing test maintenance and reducing code duplication. A page object is an object-oriented class that serves as an interface to a page of your Application Under Test. The tests then use the methods of this page object class whenever they need to interact with that page of the UI. The benefit is that if the UI changes for the page, the tests themselves don't need to change, only the code within the page object needs to change. Subsequently all changes to support that new UI are located in one place.
The Page Object Design Pattern provides the following advantages :
- There is a clean separation between test code and page specific code such as locators (or their use if you're using a UI map) and layout.
- There is a single repository for the services or operations offered by the page rather than having these services scattered through out the tests.
For example you have a LoginPage that you can reuse in all your integration test.
if the logon has now a new option or the layout changed a bit� adapt the LoginPage� that's it !
More on page object : page-objects-in-selenium-2-, PageObjectFactory, simple example based on google search page
Be fluent !
With return this
It makes often your tests more readable if your "void" methods return "this".
1 2 3 4 5 6 | public class CampaignCreatePage extends AbstractPage {
...
public CampaignCreatePage withCampaignName(String campaignName) {
name.sendKeys(campaignName);
return this;
}
|
So you can chain the calls like :
1 2 3 4 5 6 7 8 9 10 11 | @Test
public void shouldntSaveWithoutAnyErrors() throws Exception {
CampaignCreatePage createPage = openCampaignCreatePage();
createPage.hasNumberOfErrors(4);
createPage.withCampaignName("SELENIUM").save();
createPage.hasNumberOfErrors(3);
createPage.withAgent("firefox").save();
createPage.hasNumberOfErrors(2);
createPage.withAssignee("tom").save();
createPage.hasNumberOfErrors(1);
}
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With varargs
You can also use varargs to make the api cleaner
1 2 3 4 | public CampaignCreatePage withCampaignTargetsIds(long... targets) {
targetsIds.sendKeys(StringUtils.join(target,","));
return this;
}
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In the test this give us something like
1 2 3 4 5 6 | @Test
public void shouldntSaveTargetUnknownIds() throws Exception {
CampaignCreatePage createPage = openCampaignCreatePage();
createPage.withCampaignName("SELENIUM").withAgent("firefox").withAssignee("tom").withProduct(0).withCampaignTargetsIds(1, 2, 3, 4);
createPage.save().hasNumberOfErrors(1);
}
|
With generics
If you have a component that don't have access to your pageObject. For example, a generic menu where plugins can contribute links to their own pages.
you can use this trick :
1 2 3 4 | public T clickOnMenu(String path, Class pageClassToProxy) {
clickOnMenu(path);
return PageFactory.initElements(getDriver(), pageClassToProxy);
}
|
1 2 3 4 5 6 7 8 | @Test
public void testBrodocWithoutMemberOrProspectIdentified() {
processLogon();
MemberIdentificationPage page = openMemberIdentificationPage();
page = page.getMenuElement().clickOnMenu(LuceneSearchPage.URL, LuceneSearchPage.class);
page.hasInfoMessage();
page.withNameFilter("mestachs").search().getResults().hasResults()
}
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By reusing your model and joda
For example the CampaignSearchPage can reuse the SearchCampaignParameter
1 2 3 4 5 6 7 8 9 10 11 12 | ...
public CampaignSearchPage searchFor(SearchCampaignParameter parameter) {
clearForm();
selectRadio("campaignTargetType", parameter.getPersonType());
sendString(campaignName, parameter.getCampaignName());
sendDate(creationDateFrom, parameter.getCreationDateFrom());
sendDate(creationDateTo, parameter.getCreationDateTo());
sendDate(campaignDateFrom, parameter.getCampaignDateFrom());
sendDate(campaignDateTo, parameter.getCampaignDateTo());
findCampaigns.click();
}
...
|
Be robust and portable
Preferred selector order : id > name > css > xpath
To locate an element we can use
- the element's ID
- the element's name attribute
- an XPath statement
- by a links text
- document object model (DOM)
In practice, you will discover
- id and name are often the easiest and sure way.
- xpath are often brittle. for example you have 3 tables displayed but sometimes there are no data and the table isn't rendered, your xpath locating the second table will not always return the intented one.
- css are the way to go in conjunction of id and name !
- locating links in an internationalized application is sometimes hard� try to use partial href.
various selectors articles : why-jquery-in-selenium-css-locators-is-the-way-to-go, css selector demystified, jquery selectors
Avoid Thread.sleep prefer Wait or FluentWait
Instead of sleep
1 2 3 4 | public void clickOnContactType() {
getDriver().findElement(By.id("contacttypelink")).click();
sleep(500);
}
|
Prefer this fluentWait
1 2 3 4 | public void clickOnContactType() {
getDriver().findElement(By.id("contacttypelink")).click();
SeleniumUtil.fluentWait(By.name("handle"), getDriver());
}
|
It's more robust, deterministic, in case of element not found� the exception will be clearer.
Another alternative is
1 2 3 4 | (new WebDriverWait(driver, 30)).until(new ExpectedCondition() {
public Boolean apply(WebDriver d) {
return d.getTitle().toLowerCase().startsWith("java developer");
}
|
More on this http://www.thoughtworks-studios.com/twist-agile-test-automation/2.3/help/how_do_i_handle_ajax_in_selenium2.html
Use relative URLs
Avoid hardcoding hosts
1 2 3 | WikiMainPage page = PageFactory.initElements(getDriver(), WikiMainPage.class);
page.search("sdfsdf");
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Prefer configuration and pass relative urls like
That use an abstract method
1 2 3 4 5 6 7 8 9 10 11 12 13 | protected void openPartialUrl(String partialurl) {
getDriver().get(getUrlPrefix() + partialurl + "?siteLanguage=" + this.settings.getLanguage());
}
private static String getPrefix() {
return StringUtils.replace(System.getProperty("selenium.website.url", HTTP_PREFIX), "@localhost@", getCanonicalHostName());
}
private static String getCanonicalHostName() {
try {
return java.net.InetAddress.getLocalHost().getCanonicalHostName();
} catch (Exception e) {
return "127.0.0.1";
}
}
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It is easy then to launch these tests against another server (integration,acceptance,� or jetty in integration tests)
Don't rely on specific Driver implementation
Don't assume that driver will be an instance of FireFoxDriver or InternetExplorerDriver. For example when running the integration tests on your continuous build (linux) you will receive a RemoteDriver.
It's quite easy to create a small framework around selenium using :
- LabelledParameterized : to be able to run with different browsers IE,FF,� or with different user language fr/nl/en
- ScreenShotWatchMan : that takes screenshot on exception and logs the html sources. (see ./target/screenshot/*.png)
Create your dataset
Avoid something like assuming that the data is always there.
1 2 3 4 | CampaignConsultPage consult = openCampaignConsultPage(2132103215L);
CampaignEditPage edit = consult.goToEditPage();
consult = edit.save();
consult.hasInfoMessage();
|
Create a new campaign and check consult
1 2 3 4 5 6 7 8 9 | CampaignCreatePage createPage = openCampaignCreatePage();
createPage.withCampaignName("SELENIUM" + new DateTime()).withAgent("tom").withAssignee("tom").withProduct(0);
createPage.save().hasNumberOfErrors(0);
createPage.hasInfoMessage();
Long campaignId = createPage.getCampaignId();
CampaignConsultPage consult = openCampaignConsultPage(campaignId);
CampaignEditPage edit = consult.goToEditPage();
consult = edit.save();
consult.hasInfoMessage();
|
Know your new tool
Keep up to date
Keep your binaries and knowledge up to date !
This official blog contains announcements and also some a lot of links to possible application of selenium
StackOverflow forums are really good to learn from other mistakes. The official Sauce Labs Blog is also really interesting for their real life experiences.
Use jre 1.6
If while starting your integration tests you encounter :
java.lang.NoSuchFieldError: HOURS at org.openqa.selenium.remote.internal.HttpClientFactory.(HttpClientFactory.java:44)
or
java.lang.NoSuchFieldError: java/util/concurrent/TimeUnit.HOURS
Run your test with a jre 1.6
How to close Firebug startpage
FirefoxProfile profile = new FirefoxProfile(); profile.setPreference("extensions.firebug.currentVersion", "1.8.2"); driver = new FirefoxDriver(profile); note that you may need to adapt the version.
IE not working
check
- The browser zoom level must be set to 100% so that the native mouse events can be set to the correct coordinates.
- On IE 7 or higher on Windows Vista or Windows 7, you must set the Protected Mode settings for each zone to be the same value. The value can be on or off, as long as it is the same for every zone. To set the Protected Mode settings, choose "Internet Options�" from the Tools menu, and click on the Security tab. For each zone, there will be a check box at the bottom of the tab labeled "Enable Protected Mode".
Possible workaround for Protected Mode
1 2 3 4 | DesiredCapabilities ieCapabilities = DesiredCapabilities.internetExplorer();
ieCapabilities.setCapability(InternetExplorerDriver.INTRODUCE_FLAKINESS_BY_IGNORING_SECURITY_DOMAINS, true);
ieCapabilities.setCapability("ensureCleanSession", true);
driver = new InternetExplorerDriver(ieCapabilities);
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How to deal with ui elements like
File upload
Selenium Tips: Uploading Files in Remote WebDriver
Single and multi select
One option
1 2 3 4 5 6 7 | public class AbstractPage {
...
protected void selectRadio(String name, String code) {
WebElement select = this.webDriver.findElement(By.xpath("//input[@value='" + code+ "'and @name='" + name + "' ]"));
select.click();
}
...
|
Maybe a better option is using org.openqa.selenium.support.ui.Select
1 2 3 4 5 6 7 8 | Select singleSelection = new Select(getDriver().findElement(By.id("single-selection")));
singleSelection.selectByVisibleText("July");
Select mulitpleSelection = new Select(getDriver().findElement(By.xpath("//select[@multiple='multiple' and @size=12]")));
mulitpleSelection.deselectAll();
mulitpleSelection.selectByIndex(1);
mulitpleSelection.selectByValue("Aug");
mulitpleSelection.selectByVisibleText("November");
|
DatePicker
1 2 3 4 | public class CampaignSearchPage extends AbstractPage {
...
sendDate(creationDateFrom, parameter.getCreationDateFrom());
...
|
sendDate is defined in AbstractPage
1 2 3 4 5 | protected void sendDate(WebElement e, DateMidnight dm) {
if (dm != null) {
sendString(e, dm.toString("dd/MM/YYYY"));
}
}
|
AjaxTableElement
If you use table elemenst with paging, sorting,� you can perhaps create a component AjaxTableElement
add in pageObject :
1 2 3 4 5 6 | public class CampaignSearchPage extends AbstractPage {
....
public AjaxTableElement getTableResult() {
return new AjaxTableElement(getDriver(),"results");
}
}
|
Then you can use the AjaxTableElement
1 2 3 | page.searchFor(param);
page.getTableResult().hasResult();
page.getTableResult().clickOnResult(1);
|
Detect when selenium isn't the good tool for the job
Selenium can't deal with OS level dialogs so first avoid them as much as possible�
For eg don't try to download a pdf through selenium and open acrobat reader.
You may be tempted to use tool like : autoit or sikuli (his java api) but you will loose portability and may be they will only offer you a false sense of quality.
Don't be afraid to hack around selenium
A lot of people are using it but also trying new stuff like :
- collecting performance statistics.
- creating a full acceptance framework
- implementing a new webdriver
