Describe the Issue
Running tests from VS Code with C# Dev Kit fails to start when diagnostic logging is enabled and the diagnostic output directory contains spaces.
Steps to Reproduce
- Create a new MSTest project in a folder whose path contains spaces:
/home/<user>/src/Example Solution
- Ensure the test project uses MTP.
- Open the folder in a fresh VS Code window and wait for C# Dev Kit to discover tests.
- In Test Explorer, choose Debug on any test.
Expected Behaviour
The test process starts and logs diagnostics to the correct directory.
Actual Behaviour
The test host exits immediately. Output shows the diagnostic path split at spaces.
Diagnostic file (level 'Information' with async flush): /home/<user>/src/Example Solution/artifacts/build/bin/Example.Tests/debug/"/home/<user>/src/Example/log_260317001604517.diag
Option '--diagnostic-output-directory' from provider 'Platform command line provider' (UID: PlatformCommandLineProvider) expects at most 1 arguments
Evidence
With VS Code C# debug log tracing enabled, debug console shows the path quoted but escaped, so the directory is not treated as a single token.
[Start Debugging] CreateProcess((null), "/home/<user>/src/Example Solution/artifacts/build/bin/Example.Tests/debug/Example.Tests" --server --diagnostic --diagnostic-verbosity Information --diagnostic-output-directory \"/home/<user>/src/Example Solution/artifacts/build/bin/Example.Tests/debug/Log\" --client-port 43653 , inheritHandles:0, launchFlags:0x4, currentDirectory:/home/<user>/src/Example Solution/artifacts/build/bin/Example.Tests...
Extension version: 2.10.3
VS Code version: Code 1.111.0 (ce099c1ed25d9eb3076c11e4a280f3eb52b4fbeb, 2026-03-06T23:06:10Z)
OS version: Windows_NT x64 10.0.26200
Modes:
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2
System Info
| Item |
Value |
| CPUs |
Intel(R) Core(TM) Ultra 5 125U (14 x 2688) |
| GPU Status |
2d_canvas: enabled
GPU0: VENDOR= 0x8086, DEVICE=0x7d45 [Intel(R) Graphics], DRIVER_VENDOR=Intel, DRIVER_VERSION=32.0.101.7026 ACTIVE
GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.7309
Machine model name:
Machine model version:
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
trees_in_viz: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off |
| Load (avg) |
undefined |
| Memory (System) |
31.51GB (12.98GB free) |
| Process Argv |
--folder-uri=vscode-remote://wsl+Ubuntu-24.04/home/lhook/src/Cloud%20Application%20Guidelines/Canary%20API --remote=wsl+Ubuntu-24.04 --crash-reporter-id 3dadc642-0059-4492-a57b-4855c93d5ec0 |
| Screen Reader |
no |
| VM |
0% |
| Item |
Value |
| Remote |
WSL: Ubuntu-24.04 |
| OS |
Linux x64 6.6.87.2-microsoft-standard-WSL2 |
| CPUs |
Intel(R) Core(TM) Ultra 5 125U (14 x 0) |
| Memory (System) |
15.37GB (11.87GB free) |
| VM |
0% |
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Describe the Issue
Running tests from VS Code with C# Dev Kit fails to start when diagnostic logging is enabled and the diagnostic output directory contains spaces.
Steps to Reproduce
/home/<user>/src/Example SolutionExpected Behaviour
The test process starts and logs diagnostics to the correct directory.
Actual Behaviour
The test host exits immediately. Output shows the diagnostic path split at spaces.
Evidence
With VS Code C# debug log tracing enabled, debug console shows the path quoted but escaped, so the directory is not treated as a single token.
[Start Debugging] CreateProcess((null), "/home/<user>/src/Example Solution/artifacts/build/bin/Example.Tests/debug/Example.Tests" --server --diagnostic --diagnostic-verbosity Information --diagnostic-output-directory \"/home/<user>/src/Example Solution/artifacts/build/bin/Example.Tests/debug/Log\" --client-port 43653 , inheritHandles:0, launchFlags:0x4, currentDirectory:/home/<user>/src/Example Solution/artifacts/build/bin/Example.Tests...Extension version: 2.10.3
VS Code version: Code 1.111.0 (ce099c1ed25d9eb3076c11e4a280f3eb52b4fbeb, 2026-03-06T23:06:10Z)
OS version: Windows_NT x64 10.0.26200
Modes:
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2
System Info
GPU0: VENDOR= 0x8086, DEVICE=0x7d45 [Intel(R) Graphics], DRIVER_VENDOR=Intel, DRIVER_VERSION=32.0.101.7026 ACTIVE
GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.7309
Machine model name:
Machine model version:
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
trees_in_viz: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off
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