To write tests with GitHub Copilot, give Copilot the code or behavior to test, name your testing framework, and specify the normal, boundary, invalid, and error cases that matter. Ask it to follow existing tests in your project, then inspect and run every generated test. Copilot can draft the suite; you are responsible for confirming it checks the intended behavior.
Choose the right workflow
| Situation | How to ask | Why |
|---|---|---|
| The implementation already exists | Use Copilot Chat’s /tests command on the active file or selected code, or ask for tests directly. |
The command is intended to generate tests for existing code that Copilot can inspect. GitHub’s IDE chat guide describes the command. |
| You are following test-driven development | Describe the desired behavior in a normal Copilot Chat prompt; do not use /tests. |
For tests-first work, there may be no implementation file for the command to analyze. The same IDE guide distinguishes this workflow from generating tests for existing code. |
Prepare context before prompting
Open the function, class, or file you want to test. If the project has tests already, open a nearby example or identify its path in your prompt. That gives Copilot useful evidence about the test framework, naming style, setup, and project conventions. It cannot reliably infer undocumented business rules, so state those explicitly.
Before asking, identify the behavior the tests should verify. Consider which of these apply:
- Expected behavior for ordinary valid inputs.
- Boundary values, including empty, minimum, maximum, or unusually large inputs.
- Invalid inputs and expected validation behavior.
- Exceptions: what should fail, and how the failure should be represented.
- Side effects, such as calls to dependencies, persisted changes, or emitted events.
- Relevant branches or interactions between conditions.
These details are more useful than asking for a “comprehensive” suite without defining what comprehensive means. GitHub’s writing-tests guide recommends describing the scenarios and reviewing generated tests for missing cases.
#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.
Write a specific prompt
Adapt this pattern to your codebase:
Write tests for [function or behavior] using [framework]. Follow the patterns in [existing test file]. Cover the expected behavior for [normal cases], [boundary cases], and [invalid or error cases]. Include [relevant side effects or dependency interactions]. Do not assume business rules that are not stated; list any unclear requirement before encoding it in an assertion.
For example, replace the brackets with the actual function name, framework, test-file path, and requirements. If you have not settled a requirement, ask Copilot to identify the ambiguity rather than letting it invent an expected result. A reusable GitHub prompt-file example also recommends descriptive test names, Arrange–Act–Assert structure, independent tests, and assertions focused on behavior rather than implementation details: Generate unit tests.
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.
Review and run the generated tests
- Check each assertion against the requirement. A test that passes can still encode the wrong business rule. Verify that expected values and failure behavior came from requirements, not guesswork.
- Look for missing cases. Compare the generated suite with the normal, boundary, invalid, exception, side-effect, and branch scenarios relevant to the code. Generated tests may not cover every scenario; GitHub makes this limitation explicit in its testing guidance.
- Check independence and readability. Tests should be understandable on their own, use meaningful names, and avoid depending on execution order or private implementation details unless the project has a justified convention.
- Run the project’s test command. Use the command and setup already established by your project. Resolve compilation, fixture, import, and environment errors, then run the relevant tests again.
- Improve the suite yourself. Add missing assertions or cases, and remove tests that merely duplicate coverage without checking a distinct behavior.
Copilot can help draft unit and integration tests, but generated output is not evidence that the behavior is correct or that coverage is complete. Review-and-run guidance is also discussed in GitHub’s article on increasing test coverage.
Check availability and project fit
GitHub’s writing-tests guide lists a Copilot subscription, Visual Studio, Visual Studio Code, or a JetBrains IDE, and the GitHub Copilot extension among its prerequisites. Exact subscription and IDE requirements can change; check the current official guide for the setup you use.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →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.
The reusable unit-test prompt-file example is marked public preview and lists availability in VS Code, Visual Studio, and JetBrains IDEs. Because preview status and editor support may change, verify the current status in the prompt-file documentation before relying on it.
Troubleshoot common problems
- The tests use the wrong framework or style: Name the framework and point Copilot to an existing test file. Check imports, fixtures, and naming against the project’s actual setup.
- Assertions seem plausible but requirements are unclear: Clarify the expected behavior yourself. Ask Copilot to surface questions rather than encode an unstated assumption.
- Important cases are missing: Prompt for the specific untested category—such as boundary values, invalid input, exceptions, or a dependency interaction—and inspect the result rather than assuming a follow-up request completes coverage.
- Tests fail to compile or run: Inspect generated imports, test setup, mocks, and fixture usage. Compare them with nearby working tests, correct the mismatch, and rerun the suite.
- Tests pass but do not protect behavior: Examine whether the assertions would fail if the behavior were wrong. Replace assertions that only mirror implementation details with ones tied to the stated outcome.
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server for developers, not a GitHub Copilot test-writing feature; it is not a substitute for writing or running code tests. If your workflow also needs website screenshots, one GET request can capture a page. See the ScreenshotNeo API documentation.
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
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp
- Cookie banners are accepted and more than 60 known consent platforms, newsletter popups, and chat widgets are removed before capture; each step can be turned off.
- Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing; response headers report the page verdict and billing status.
- An MCP server gives AI agents tools to take screenshots, get page information, and capture PDFs.
- The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000.
Learn about ScreenshotNeo or sign up free for 1,000 screenshots a month with no card.
Free tools Windows power users keep installed
One-click scans. No signup required.
Quick Recap
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.
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.
