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Also, you can include it in your building tool like Maven or Gradle, among others as you can see here. Web Testing There are many ways in which you can test a web application — most of which we covered here on the site at one point or another. All of it, using pure Java code. You should correct them. Fetching, parsing, storing and analyzing data from websites is the process known as web scraping and HtmlUnit can help you with the fetching and parsing parts.
The previous example shows how we can enter any website and navigate through it, retrieving all the info we want. HtmlUnit allows us to use it, so we will. In a real web scraping, you could take for example the h1 and h2 titles, and the outcome would be something like this: Java Web Weekly, Issue 1. Spring and Java 2. Technical and Musings 3.
Comics 4. Pick of the Week You can check that the retrieved info corresponds to the latest article in Baeldung indeed: 6. Many times you need them to finish to properly test your website or to retrieve the data you want. There are some ways to deal with them: You can use webClient. This resynchronizes calls performed from the main thread and these calls are performed synchronously to ensure that there is a stable state to test. When entering a page of a web application, you can wait for some seconds so there is enough time to let AJAX calls finish.
To achieve this, you can use webClient. You should call them after retrieving the page, but before working with it. You can wait until some expected condition related to the execution of the AJAX call is met. The user can input a text into the form, submit the form, and the text will be shown below that form. Conclusion HtmlUnit is a great tool that allows you to test your web applications easily, filling forms fields and submitting them just as if you were using the web on a browser.
It integrates seamlessly with Spring 4, and together with Spring MVC Test framework they give you a very powerful environment to make integration tests of all your pages even without a web server. Also, using HtmlUnit you can automate any task related to web browsing, such as fetching, parsing, storing and analyzing data web scraping. You can get the code over on Github. Generic bottom I just announced the new Learn Spring course, focused on the fundamentals of Spring 5 and Spring Boot
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Yet another approach Rails developers and to a lesser extent Java web developers commonly use yet another test automation technique: hosting the app in a real web server, and accessing it through a fast, invisible, simulated web browser rather than a real browser. This is known as headless browser automation. How is this beneficial? Real browsers are complicated. For example, if you launch and shut down Firefox many times in rapid succession, occasionally it will fail to launch because a previous instance is still locking some file. You can get more low-level control if you want it.
Selenium Beginner 13 – How to use HtmlUnit Driver