What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Use JUnit Jupiter assertions to verify what Selenium reads from the browser after an interaction: a page title, displayed message, input value, or other observable state. For changing pages, wait for the relevant condition before reading and asserting the result. Use assertThrows only when the test is meant to check that an operation throws a particular exception.
Set up a Selenium check that verifies an outcome
An assertion should check a result of the browser interaction—not merely confirm that a click or other action was called. Selenium’s official Java example checks the page title, submits a form, and then checks the resulting message. The following examples use JUnit Jupiter’s static assertion methods.
import static org.junit.jupiter.api.Assertions.assertEquals;
// Navigate and interact with the page first.
String title = driver.getTitle();
assertEquals("Web form", title);
// After entering text and submitting the form:
String message = driver.findElement(By.id("message")).getText();
assertEquals("Received!", message);assertEquals(expected, actual) reads naturally as a comparison: the expected value comes first, and the value obtained from the browser comes second. Selenium’s example uses this pattern for both page text and an element value. The snippets here illustrate the documented approach; they are not a complete test class and have not been independently run. See Selenium’s Java getting-started example.
Choose an assertion that matches the result
Equal values: assertEquals
Use equality when the expected and actual values should match, such as a title, confirmation text, or input value:
Free tools Windows power users keep installed
One-click scans. No signup required.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
assertEquals("Order received", confirmation.getText());Boolean conditions
When the requirement is a predicate rather than an exact value—for example, that an element is displayed—use a boolean assertion from JUnit Jupiter and express the condition directly. Keep the assertion tied to the expected browser state, rather than to the fact that an interaction method ran.
Exceptions: assertThrows
Use assertThrows when immediate failure is the behavior under test. It takes the expected exception class and an executable; if that exception is thrown, the method returns it.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
import static org.junit.jupiter.api.Assertions.assertThrows;
NoSuchElementException exception = assertThrows(
NoSuchElementException.class,
() -> driver.findElement(By.id("not-present"))
);This is not the right check when the element is expected to appear after an asynchronous update. In that case, wait for the expected state and assert it instead.
Wait before asserting dynamic page content
A page may not have reached the state your assertion expects immediately after a click or navigation. Synchronize on the condition the next operation depends on, then read the value. Selenium documents explicit waits, implicit waits, and fixed sleeps; an explicit condition makes the required state clear in the test. The appropriate wait depends on the application and the operation, so these examples do not establish one strategy for every page.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Wait for an element to become visible
import static org.junit.jupiter.api.Assertions.assertEquals;
import java.time.Duration;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.ui.Wait;
import org.openqa.selenium.support.ui.WebDriverWait;
WebElement revealed = driver.findElement(By.id("revealed"));
driver.findElement(By.id("reveal")).click();
Wait<WebDriver> wait = new WebDriverWait(driver, Duration.ofSeconds(2));
wait.until(d -> revealed.isDisplayed());
revealed.sendKeys("Displayed");
assertEquals("Displayed", revealed.getDomProperty("value"));This follows Selenium’s documented explicit-wait example: wait until the element is displayed, enter text, and assert the input’s value. Adapt the condition and value accessor to the page and Selenium API version in your project. For more on synchronization choices, consult Selenium’s waiting strategies documentation.
Check an exception message separately
The message supplied as an assertion’s failure-message parameter explains a failed test; it is not the expected message from the exception. To verify an exception’s message, first capture the exception with assertThrows, then make a separate assertion on its message:
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
MyException exception = assertThrows(
MyException.class,
() -> performOperation()
);
assertEquals("expected detail", exception.getMessage());JUnit documents this two-step check in its JUnit 5.14.4 Assertions API.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common assertion failures
- The actual text is empty or unexpected: Check that the locator identifies the intended element and that the page has reached the expected state before reading it. If content appears asynchronously, wait for the relevant condition.
- The lookup throws before the assertion runs: If the element should appear later, an immediate lookup is premature; wait for the expected state. If immediate absence is the behavior under test, assert the expected exception with
assertThrows. - The input-value check does not match: Confirm that the test interacts with the intended input and reads the property representing its current value. The Selenium example uses
getDomProperty("value"); adjust the accessor for your page and Selenium API version. - The exception assertion fails: Verify that the operation inside the executable is expected to throw the specified type. If no exception is thrown, or a different type is thrown, the expected-exception check does not pass.
- The exception type is right but its message check fails: Compare the actual exception message separately from the assertion failure message; they serve different purposes.
Version and dependency notes
The JUnit Assertions API linked here is version 5.14.4, while the Selenium documentation examples do not establish a complete Java, browser, driver, Selenium, and JUnit compatibility matrix. Check the current project documentation and your project’s dependency configuration for the versions you use rather than inferring compatibility from an example.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Or skip the browser setup
If your goal is to capture a page rather than write an assertion-driven browser test, ScreenshotNeo is a website screenshot API and MCP server. Its API accepts a URL in a GET request and can return a PNG, JPEG, WebP, or PDF. It can accept cookie and consent banners before capture and remove more than 60 known consent platforms, newsletter popups, and chat widgets; each of those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing status. An MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents and other MCP clients.
curl -G "https://api.screenshotneo.com/v1/shot"
-d access_key=YOUR_API_KEY
--data-urlencode url=https://stripe.com
-o shot.webpSee the ScreenshotNeo documentation for API details. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for ScreenshotNeo’s free plan.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
