wsltests is a single large target whose compile time dominates local test
iteration. Enabling CMake unity builds batches test sources into shared
translation units, cutting wall-clock build time significantly.
Batch size is controlled by the new WSL_TEST_UNITY_BATCH_SIZE cache variable
(default 2). Setting it to 0 disables unity builds and compiles every file
separately, which is useful for isolating a build break to a single source
file. The value is validated at configure time and documented in
UserConfig.cmake.sample.
Concatenating sources into one translation unit surfaced latent collisions
that file scope had previously hidden:
- g_pipelineBuildId was defined as a separate file-static in both Common.cpp
and InstallerTests.cpp. Common.cpp now owns the definition and
InstallerTests.cpp declares it extern.
- ProcessOutput was declared at namespace scope in both WslcSdkTests.cpp and
WslcSdkWinRTTests.cpp. The latter is renamed to CapturedProcessOutput.
- Broad `using namespace wsl::windows::common;` directives in
WindowsUpdateTests.cpp, WSLCE2EHelpers.cpp, WSLCE2ETlsRegistryTests.cpp and
WSLCExecutor.cpp leaked into neighboring sources and created ambiguous
lookups. They are replaced with targeted using-declarations and namespace
aliases.
Unity builds also change test execution order, which broke assertions that
implicitly depended on running before anything else had created a session.
WSLCTests::ListSessions and WSLCTests::SessionManagement now share a
ListTestSessionNames() helper that filters out the persistent sessions the
wslc CLI creates for itself, so the assertions no longer depend on what else
has run on the machine.
SessionManagement is the only test that creates persistent sessions, which
outlive the COM reference that created them. It now records the ones it
creates and terminates them from a scope_exit handler, so a failure partway
through cannot leak a session into subsequent runs.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Updates the WSLC SDK install API to allow more flexibility in the calling pattern, specifically enabling caller-initiated updates/reinstalls to WSL even when WSLC is already present.
