Individual tests do not show until opening the test file

[Austinpayne]

Describe the bug

I recently started having an issue where individual tests in the test panel do not show up unless I have previously opened the test file they are found in. Only the top level suite (or sometimes just the test target) appear. This is reproducible in the swift-nio repo. For example, notice how the NIOBase64Tests do not enumerate until I open the test file, even after having built the project and ran all tests.

Aside: I have not (intentionally) opted into pre-releases of the plugin but the version I am running does not match the latest 2.10.0 tag here in the repo. Not sure what that is about.

To Reproduce
Steps to reproduce the behavior:

1. Clone and open swift-nio: https://github.com/apple/swift-nio
2. Note that individual tests don't enumerate after package resolution
3. Build/run all tests, e.g. cmd+; a
4. Note that individual tests still don't enumerate
5. Open a test file (e.g. Tests/NIOBase64Tests.swift)
6. Note that the tests from that file now enumerate

Expected behavior

Individual tests show up in the test panel, similar to how it used to work. Apologies, I don't have those versions handy, I just know that recently (within the last week) I noticed this change of behavior.

Environment

• OS: macOS Sequoia 15.7
• Swift version: swift-driver version: 1.120.5 Apple Swift version 6.1 (swiftlang-6.1.0.110.21 clang-1700.0.13.3)
• Visual Studio Code version: 1.104.3
• vscode-swift version: 2.11.20250806

Additional context

I am able to reproduce this with Swift 6.2 as well, inside a swift:noble dev-container.

[plemarquand]

@Austinpayne thanks for the report. Could you run Swift > Capture Diagnostic Bundle and attach the zip it produces? It can be a Minimal Bundle; I'm mainly interested in whether or not you have background indexing enabled.

[Austinpayne]

Certainly! Here it is:

vscode-diagnostics-2025-10-06T12-51-31-06-00.zip

[Austinpayne]

Looking at my config, this is worth mentioning: I thought I was on Swift 6.1 but I did install Swift 6.2 on my mac which is correctly being used by vscode. I installed 6.2 with swiftly.