Joseph Doherty b1f3e09661 test(modbus, abcip): align failing integration tests with fixtures ...

Two real bugs uncovered by re-running with the new fixture defaults
pointing at the shared docker host. Both are test-side, not driver-side.

AbCip — Driver_reads_seeded_DInt_from_ab_server (4 parametrized rows):
  Hardcoded 'ab://127.0.0.1:{port}/1,0' in the deviceUri instead of
  the resolved fixture.Host. The new 10.100.0.35 default (and any
  AB_SERVER_ENDPOINT override) silently couldn't reach this test —
  the driver tried to connect to a non-existent localhost:44818 and
  returned BadCommunicationError on all 4 profile rows. The sibling
  Emulate tests already use the fixture's resolved endpoint; this
  smoke test was missed in the original migration.

  Fix: deviceUri = $"ab://{fixture.Host}:{fixture.Port}/1,0".

Modbus — Float32_With_CDAB_Roundtrips_Through_Wire:
  Test wrote a Float32 to HR 100 (2 consecutive registers: 100+101).
  standard.json's writable HR range declares [100,100] only — a
  single-cell auto-incrementing register, not a 2-register pair. The
  write to register 101 was rejected with Illegal Data Address
  (BadOutOfRange).

  Fix: moved the tag from HR 100 to HR 200 (in standard.json's
  '[200, 209]' scratch range — 10 consecutive writable HRs). The
  Float32+CDAB semantic the test exercises is unchanged.

Modbus — Block_Read_Coalescing_Reduces_PDU_Count_End_To_End:
  Test read HR 300, 302, 304 — outside both the writable ranges and
  the uint16 seed list. pymodbus rejects reads to unseeded HRs even
  though 'hr size' is 2048. BadOutOfRange on every read.

  Fix: moved the tags from 300/302/304 to 200/202/204 (within the
  scratch range). The non-contiguous coalescing semantic (3 tags
  inside a 5-register window with MaxReadGap=5) is preserved.

After this commit:
  - Modbus.IntegrationTests: 6/38 pass / 32 skip / 0 fail
    (was 4 pass / 32 skip / 2 fail; 32 skips are profile-gated
    ExceptionInjectionTests — they need MODBUS_SIM_PROFILE=
    exception_injection and a different container, intentional gating)
  - AbCip.IntegrationTests: 10/12 pass / 2 skip / 0 fail
    (was 6 pass / 2 skip / 4 fail; 2 skips are Emulate tests that
    need the fixture for separate scenarios)

No driver code changed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-23 19:45:57 -04:00

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