[docs] Document VSCode tests and gradle tasks (#1641)

docs/source/docs/contributing/building-photon.md

@@ -167,30 +167,31 @@ repositories {
 }
 ```
 
+### VSCode Test Runner Extension
+
+With the VSCode [Extension Pack for Java](https://marketplace.visualstudio.com/items?itemName=vscjava.vscode-java-pack), you can get the Test Runner for Java and Gradle for Java extensions. This lets you easily run specific tests through the IDE:
+
+```{image} assets/vscode-runner-tests.png
+:alt: An image showing how unit tests can be ran in VSCode through the Test Runner for Java extension.
+```
+
+To correctly run PhotonVision tests this way, you must [delegate the tests to Gradle](https://code.visualstudio.com/docs/java/java-build#_delegate-tests-to-gradle). Debugging tests like this will [**not** currently](https://github.com/microsoft/build-server-for-gradle/issues/119) collect outputs.
+
 ### Debugging PhotonVision Running Locally
 
-One way is by running the program using gradle with the {code}`--debug-jvm` flag. Run the program with {code}`./gradlew run --debug-jvm`, and attach to it with VSCode by adding the following to {code}`launch.json`. Note args can be passed with {code}`--args="foobar"`.
+Unit tests can instead be debugged through the ``test`` Gradle task for a specific subproject in VSCode, found in the Gradle tab:
 
-```
-{
-   // Use IntelliSense to learn about possible attributes.
-   // Hover to view descriptions of existing attributes.
-   // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-   "version": "0.2.0",
-   "configurations": [
-      {
-            "type": "java",
-            "name": "Attach to Remote Program",
-            "request": "attach",
-            "hostName": "localhost",
-            "port": "5005",
-            "projectName": "photon-core",
-      }
-   ]
-}
+```{image} assets/vscode-gradle-tests.png
+:alt: An image showing how unit tests can be debugged in VSCode through the Gradle for Java extension.
 ```
 
-PhotonVision can also be run using the gradle tasks plugin with {code}`"args": "--debug-jvm"` added to launch.json.
+However, this will run all tests in a subproject.
+
+Similarly, a local instance of PhotonVision can be debugged in the same way using the Gradle ``run`` task. In both cases, additional arguments can be specified:
+
+```{image} assets/vscode-gradle-args.png
+:alt: An image showing how VSCode gradle tasks can specify additional arguments.
+```
 
 ### Debugging PhotonVision Running on a CoProcessor