C# Dev Kit Test Explorer doesn't run tests - Incorrect format for TestCaseFilter Error: Empty parenthesis ( )

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#3,294 opened on Jul 9, 2026 2 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 48/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Quiet
Tech stack: csharp
Domain: devtools, testing

Research direction

Start by reviewing the attached csdevkit logs and the Test Explorer path triggered by the Run Tests button or top-level project item. Trace where the empty TestCaseFilter is produced and compare the behavior when running all tests. Done means those actions build and execute the tests without the Empty parenthesis error.

Written by the indexing model from the issue text.

Description

bug

Describe the issue

Clicking the Run Tests button to run all tests, or clicking on the top-level project item in Testing tab builds the tests but does not run them.

In Test explorer I see this error:

[error] Incorrect format for TestCaseFilter Error: Empty parenthesis ( ). Specify the correct format and try again. Note that the incorrect format can lead to no test getting executed

Collect logs

csdevkit-logs-2026-07-09T21-39-30.zip

Steps to reproduce

No response

Expected behavior

No response

Environment information

C# Dev Kit v3.20.199
Version: 1.128.0 (user setup)
Commit: fc3def6774c76082adf699d366f31a557ce5573f
Date: 2026-07-07T15:14:24-07:00
Electron: 42.5.0
ElectronBuildId: 14525058
Chromium: 148.0.7778.271
Node.js: 24.17.0
V8: 14.8.178.33-electron.0
OS: Windows_NT x64 10.0.22631

Dominant language: No language data
Stars: 321
Forks: 54
Avg merge: 2d 19h
Merged PRs (30d): 2

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First steps

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