tests: Extended Integration Tests

[KonradBreitsprecherBkd]

Subject

Tests: extend the integration tests for logging, health monitoring, PCAP tracing, domain sockets, configuration precedence and LIN sleep/wakeup

Description

Adds integration tests for behavior that was so far only checked by hand: end-to-end scenarios with real participants and a registry, which inspect log files, PCAP output and lifecycle states.

New test files:

• ITest_HealthCheck:
  • A simulation step that exceeds the configured SoftResponseTimeout logs a warning, and the simulation continues.
  • A step that exceeds HardResponseTimeout puts the participant into the Error state.
  • Other participants observe a disconnect.
• ITest_PcapTracing: Ethernet frames of a controller with a PCAP trace sink end up in a valid PCAP stream, both for a PcapFile and a PcapPipe sink. The stream is parsed without SIL Kit internals, the same way an external tool like Wireshark reads it.
• ITest_DomainSockets: Participants on the same host connect via local domain sockets by default, and via TCP if domain sockets are disabled.
• ITest_ConfigPrecedence:
  • The participant name and the registry URI from the participant configuration override the values passed to the API.
  • The API registry URI is used if the configuration has none.
  • The controller network from the configuration overrides the API argument.

Extended:

• ITest_Lin: new test repeated_sleep_and_wakeup_cycles. LIN master and slave go through several go-to-sleep / wakeup cycles and exchange frames after every wakeup, so a slave that does not return from sleep is detected. The existing sync_lin_simulation only covers a single cycle.
• ITest_Logging now contains all logging integration tests:
  • Sink levels: each sink only receives messages at or above its level, and Level: Off writes nothing.
  • File sink naming: <LogName>_<ParticipantName>_<Timestamp>.jsonl, with one file per participant.
  • Remote logging, merged from ITest_RemoteLogging, which is removed:
    • the existing two senders / one receiver test
    • LogFromRemotes: false ignores remote messages
    • LogFromRemotes defaults to false
    • the level of the sender's Remote sink filters on the sender side

Test infrastructure:

• The log file helpers (MakeUniqueLogName, FindLogFiles, ReadTextFile, ScopedLogFiles) are in IntegrationTestUtils.hpp; no new header is added.
• IntegrationTestUtils.hpp was not included by any test so far. To include it from several tests:
  • its free functions are now inline, which avoids multiple definitions at link time
  • <Windows.h> is included with NOMINMAX
  • platform checks use defined(), because -Wundef failed for __unix__ and WIN32
• ITest_PcapTracing defines NOMINMAX / WIN32_LEAN_AND_MEAN only if they are not defined yet. MinGW's libstdc++ already defines NOMINMAX, and redefining it broke the MinGW build with -Werror.

Instructions for review / testing

• Test-only change: the files under SilKit/IntegrationTests/ and their entries in SilKit/IntegrationTests/CMakeLists.txt. No production code changes.
• Run the new and changed tests:

  SilKitIntegrationTests --gtest_filter=ITest_Logging.*:ITest_HealthCheck.*:ITest_PcapTracing.*:ITest_DomainSockets.*:ITest_ConfigPrecedence*:ITest_LinSleepWakeup.*
  

• The tests write log and PCAP files with unique names into the working directory and remove them afterwards.
• The former ITest_RemoteLogging.* tests are now ITest_Logging.*. Update test filters that select them by suite name.
• Built locally with SILKIT_WARNINGS_AS_ERRORS=ON with MSVC (VS 2026, Debug) and MinGW GCC 13.2 (Ninja). The logging, health check, domain socket and PCAP tests pass with both.

Developer checklist (address before review)

• Changelog.md updated
• Prepared update for depending repositories
• Documentation updated (public API changes only)
• API docstrings updated (public API changes only)
• Rebase → commit history clean
• Squash and merge → proper PR title