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//renderer:renderer_server_test fails when mozc_renderer is already running in Windows #1421
Description
Description
//renderer:renderer_server_test fails when mozc_renderer is already running in Windows.
Steps to reproduce
- Build
Mozc64.msiand install it. - Enable Mozc in some applications and make sure that Mozc's candidate window is shown.
bazelisk test --config oss_windows -c dbg //renderer:renderer_server_test --nocache_test_results --test_output=streamed
Expected behavior
The test succeeds at the step 3.
Actual behavior
The test fails with the following error:
[ RUN ] RendererServerTest.IPCTest
F1231 18:30:45.528271 18296 win32_ipc.cc:492] CreateNamedPipe failed231
*** Check failure stack trace: ***
@ 00007FF65B7D63F7 (unknown)
@ 00007FF65B7D6384 (unknown)
@ 00007FF65B725C58 (unknown)
@ 00007FF65B861FF3 (unknown)
@ 00007FF65B732B80 (unknown)
@ 00007FF65B7222C8 (unknown)
@ 00007FF65B722108 (unknown)
@ 00007FF65B721BDE (unknown)
@ 00007FF65B7A8160 (unknown)
@ 00007FF65B7809F8 (unknown)
@ 00007FF65B7646A3 (unknown)
@ 00007FF65B7651E9 (unknown)
@ 00007FF65B765A8B (unknown)
@ 00007FF65B77409D (unknown)
@ 00007FF65B7A9490 (unknown)
@ 00007FF65B783B58 (unknown)
@ 00007FF65B773B01 (unknown)
@ 00007FF65BC9BE71 (unknown)
@ 00007FF65BC9BE42 (unknown)
@ 00007FF65BD23FF9 (unknown)
@ 00007FF65BD24132 (unknown)
@ 00007FF65BD241BE (unknown)
@ 00007FF65BD241DE (unknown)
@ 00007FF83D99E8D7 (unknown)
@ 00007FF83E48C53C (unknown)
Version or commit-id
Environment
- OS: Windows 11 25H2
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nvssai11 commentedon Jan 1, 2026
@yukawa I’d like to help work on this issue and investigate the test failure when mozc_renderer is already running on Windows. Could you please assign it to me?
yukawa commentedon Jan 2, 2026
Hi @nvssai11,
Thank you for your interest in contributing to this issue.
While fixing this bug might seem straightforward, the solution involves a subtle trade-off regarding how much test-specific logic we should expose in the production code. Since this touches on the project's core design philosophy regarding testability, I believe it would be more efficient for the maintainers to discuss and implement the fix directly.
I will assign this issue to myself and handle it. I appreciate your willingness to help!
Simplify `RendererClient`
Simplify `RendererClient`
Simplify `RendererClient`
Simplify `RendererClient` (#1422)
Use unique services name in `renderer_server_test`
Use unique services name in `renderer_server_test`
Use unique service names in `renderer_server_test`
Use unique service names in `renderer_server_test`
Use unique service names in `renderer_server_test` (google#1433)