How to debug Rust unit tests on Windows?

Rust unit tests are compiled as separate binaries, which means you debug them exactly the same as any other binary. Once compiled, they are located at ./target/debug/$name-$hash.

Visual Studio Code

Here's modified versions of the VS Code configuration files that allow me to debug a unit test.

tasks.json

{    "type": "shell",    "label": "cargo test build",    "command": "cargo",    "args": [        "test", "--no-run"    ],    "problemMatcher": [        "$rustc"    ]}

launch.json

{    "name": "Run Test Debugger",    "type": "cppvsdbg",    "request": "launch",    "program": "${workspaceFolder}/target/debug/buggin-70708b3916187eeb.exe",    "args": [],    "stopAtEntry": false,    "cwd": "${workspaceFolder}",    "environment": [],    "externalConsole": true,    "preLaunchTask": "cargo test build",}

Working

Windbg

Build your tests:

cargo test --no-run

Open the built executable in Windbg and open the source file.

Finding the hash is the most annoying aspect. The best solution I know of is to write a small script that builds the tests and then finds the test executable based on which is newest. My Powershell skills are not adequate to the task, nor do I know how to directly integrate this with VS Code or Windbg.

There are open issues for Cargo to help with identifying the file:

• produce deterministic filenames for build --test and test --no-run (#1924)
• Make it possible to run binaries produced by cargo directly (#3670)