Integration Test Specification

Document ID	Rev	Date	Classification
SWE.5-001	1.0	2026-03-21	Confidential

Revision History

Rev	Date	Author	Reviewer	Description
1.0	2026-03-21	An Dao	--	Initial release

1. Purpose

This document specifies integration-level tests for the foxBMS 2 POSIX port, satisfying ASPICE SWE.5 (software integration and integration test) and ISO 26262 Part 6 Clause 10. Integration tests verify that modules interact correctly through their defined interfaces.

2. Scope

Integration tests verify: - CAN interface data flow (external stimulus to internal database) - Database producer/consumer data integrity across modules - State machine transitions driven by inter-module interactions - Safety path: SOA to DIAG to BMS to Contactor

3. References

ID	Title
[SWE.1-001]	Software Requirements Specification
[SWE.2-001]	Software Architecture Description
[SWE.4-001]	Unit Test Specification
[SWE.6-001]	Qualification Test Specification

4. Test Environment

Aspect	Value
Test framework	pytest 8.x
CAN interface	SocketCAN (vcan0)
SIL binary	foxBMS POSIX build (x86-64, GCC 13)
Stimulus	python-can library injecting CAN frames
Observation	python-can listener capturing TX frames
Timeout	Per-test configurable, default 5 seconds

5. Test Suites

5.1 Integration Test Suite (test_integration.py)

5.1.1 CAN Interface Integration

ID	Test Case	Stimulus	Expected Result	Traces To
IT-001 ↑ Traces Up STKH-REQ-005 STKH-REQ-006 STKH-REQ-019 SW-REQ-040 SW-REQ-041 SW-REQ-100 SYS-REQ-060 SYS-REQ-061 +2 more	State request reception	Send CAN 0x210 with NORMAL request	BMS transitions from STANDBY; CAN 0x220 reflects new state	SW-REQ-100 ↑ Traces Up STKH-REQ-007 STKH-REQ-015 STKH-REQ-018 SYS-REQ-061 SYS-REQ-070 ↓ Traces Down IT-001 IT-002 IT-008 IT-013 UT-051 UT-052 , SW-REQ-041 ↑ Traces Up STKH-REQ-006 STKH-REQ-020 SYS-REQ-072 SYS-REQ-091 ↓ Traces Down IT-001 IT-021 IT-023 IT-050 SSR-051 UT-030 UT-031 UT-061
IT-002 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 STKH-REQ-015 STKH-REQ-018 SW-REQ-090 SW-REQ-091 SW-REQ-100 SW-REQ-101 +2 more	IVT current data reception	Send CAN 0x521 with current value	Database[CURRENT] updated; value appears in CAN 0x221 TX	SW-REQ-101 ↑ Traces Up STKH-REQ-007 STKH-REQ-016 SYS-REQ-007 SYS-REQ-062 SYS-REQ-073 ↓ Traces Down IT-002 IT-003 IT-004 UT-052 , SW-REQ-091 ↑ Traces Up STKH-REQ-007 STKH-REQ-015 SYS-REQ-061 ↓ Traces Down IT-002
IT-003 ↑ Traces Up SW-REQ-101	IVT voltage data reception	Send CAN 0x522-0x524 with voltage values	Database entries updated; pack voltage reflected in TX	SW-REQ-101 ↑ Traces Up STKH-REQ-007 STKH-REQ-016 SYS-REQ-007 SYS-REQ-062 SYS-REQ-073 ↓ Traces Down IT-002 IT-003 IT-004 UT-052
IT-004 ↑ Traces Up SW-REQ-101 SYS-REQ-062	IVT temperature data reception	Send CAN 0x525 with temperature	Database entry updated	SW-REQ-101 ↑ Traces Up STKH-REQ-007 STKH-REQ-016 SYS-REQ-007 SYS-REQ-062 SYS-REQ-073 ↓ Traces Down IT-002 IT-003 IT-004 UT-052
IT-005 ↑ Traces Up SW-REQ-092 SW-REQ-102	AFE cell voltage reception	Send CAN 0x270 with multiplexed voltage data	Cell voltages appear in CAN 0x240-0x245 TX messages	SW-REQ-102 ↑ Traces Up SYS-REQ-074 ↓ Traces Down IT-005 , SW-REQ-092 ↑ Traces Up SYS-REQ-067 ↓ Traces Down IT-005
IT-006 ↑ Traces Up SW-REQ-093 SW-REQ-103	AFE cell temperature reception	Send CAN 0x280 with multiplexed temp data	Temperature data appears in CAN 0x260 TX	SW-REQ-103 ↑ Traces Up SYS-REQ-075 ↓ Traces Down IT-006 , SW-REQ-093 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SYS-REQ-060 SYS-REQ-067 ↓ Traces Down IT-006
IT-007 ↑ Traces Up SW-REQ-090 SYS-REQ-060 SYS-REQ-063 SYS-REQ-082	CAN TX periodicity	Observe CAN 0x220 timing over 2 seconds	Inter-frame interval approximately 100 ms (within 20%)	SW-REQ-090 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SYS-REQ-060 SYS-REQ-069 SYS-REQ-086 ↓ Traces Down IT-002 IT-007 IT-014 UT-050 UT-052 UT-103
IT-008 ↑ Traces Up SW-REQ-100	Unknown CAN ID rejected	Send CAN 0x999 (not in config)	No crash, no state change, frame ignored	SW-REQ-100 ↑ Traces Up STKH-REQ-007 STKH-REQ-015 STKH-REQ-018 SYS-REQ-061 SYS-REQ-070 ↓ Traces Down IT-001 IT-002 IT-008 IT-013 UT-051 UT-052

5.1.2 Database Data Flow Integration

ID	Test Case	Stimulus	Expected Result	Traces To
IT-010 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SW-REQ-001 SW-REQ-060 SW-REQ-062 SYS-REQ-001 SYS-REQ-002 SYS-REQ-003 +4 more	Cell voltage flows from AFE to SOA	Inject cell voltages via CAN 0x270	SOA reads correct voltages from database	SW-REQ-001 ↑ Traces Up STKH-REQ-007 SYS-REQ-020 TSR-001 ↓ Traces Down IT-010 IT-030 IT-036 SSR-001 UT-012 UT-015 UT-016 , SW-REQ-062 ↑ Traces Up STKH-REQ-001 STKH-REQ-002 STKH-REQ-003 STKH-REQ-004 STKH-REQ-005 STKH-REQ-006 SYS-REQ-001 SYS-REQ-002 +12 more ↓ Traces Down IT-010 IT-011 IT-012 UT-042
IT-011 ↑ Traces Up STKH-REQ-005 STKH-REQ-008 SW-REQ-010 SW-REQ-062 SW-REQ-070 SYS-REQ-010 SYS-REQ-011 SYS-REQ-012	Current flows from IVT to SOA	Inject current via CAN 0x521	SOA reads correct current from database	SW-REQ-010 ↑ Traces Up STKH-REQ-008 SYS-REQ-030 TSR-002 ↓ Traces Down IT-011 IT-036 SSR-003 UT-016 UT-020 , SW-REQ-062 ↑ Traces Up STKH-REQ-001 STKH-REQ-002 STKH-REQ-003 STKH-REQ-004 STKH-REQ-005 STKH-REQ-006 SYS-REQ-001 SYS-REQ-002 +12 more ↓ Traces Down IT-010 IT-011 IT-012 UT-042
IT-012 ↑ Traces Up SW-REQ-020 SW-REQ-062 SYS-REQ-005	Temperature flows from AFE to SOA	Inject temperatures via CAN 0x280	SOA reads correct temperatures from database	SW-REQ-020 ↑ Traces Up STKH-REQ-009 SYS-REQ-040 TSR-003 ↓ Traces Down IT-012 IT-032 IT-036 SSR-005 UT-018 UT-024 , SW-REQ-062 ↑ Traces Up STKH-REQ-001 STKH-REQ-002 STKH-REQ-003 STKH-REQ-004 STKH-REQ-005 STKH-REQ-006 SYS-REQ-001 SYS-REQ-002 +12 more ↓ Traces Down IT-010 IT-011 IT-012 UT-042
IT-013 ↑ Traces Up SW-REQ-060 SW-REQ-100 SYS-REQ-061	State request flows from CAN to BMS	Send state request via CAN 0x210	BMS reads correct request from database	SW-REQ-100 ↑ Traces Up STKH-REQ-007 STKH-REQ-015 STKH-REQ-018 SYS-REQ-061 SYS-REQ-070 ↓ Traces Down IT-001 IT-002 IT-008 IT-013 UT-051 UT-052 , SW-REQ-060 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SYS-REQ-060 TSR-015 ↓ Traces Down IT-010 IT-013 IT-060 UT-040 UT-042
IT-014 ↑ Traces Up SW-REQ-040 SW-REQ-090	BMS state flows to CAN TX	Trigger BMS state change	CAN 0x220 reflects updated BMS state	SW-REQ-090 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SYS-REQ-060 SYS-REQ-069 SYS-REQ-086 ↓ Traces Down IT-002 IT-007 IT-014 UT-050 UT-052 UT-103 , SW-REQ-040 ↑ Traces Up STKH-REQ-005 STKH-REQ-006 STKH-REQ-019 SYS-REQ-071 SYS-REQ-090 ↓ Traces Down IT-001 IT-014 IT-062 UT-030 UT-102

5.1.3 State Machine Integration

ID	Test Case	Stimulus	Expected Result	Traces To
IT-020 ↑ Traces Up SW-REQ-050 SW-REQ-053 SYS-REQ-070 SYS-REQ-073 SYS-REQ-081	SYS startup sequence	Start binary, wait 2 seconds	SYS progresses: UNINITIALIZED -> INITIALIZATION -> INITIALIZED -> IDLE -> RUNNING	SW-REQ-050 ↑ Traces Up STKH-REQ-005 STKH-REQ-006 STKH-REQ-018 SYS-REQ-070 SYS-REQ-080 SYS-REQ-081 SYS-REQ-082 SYS-REQ-083 ↓ Traces Down IT-020 UT-101 to SW-REQ-053 ↑ Traces Up STKH-REQ-018 SYS-REQ-070 SYS-REQ-083 ↓ Traces Down IT-020
IT-021 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +6 more	BMS STANDBY to PRECHARGE	Send CAN 0x210 NORMAL request	BMS state changes to PRECHARGE (6)	SW-REQ-041 ↑ Traces Up STKH-REQ-006 STKH-REQ-020 SYS-REQ-072 SYS-REQ-091 ↓ Traces Down IT-001 IT-021 IT-023 IT-050 SSR-051 UT-030 UT-031 UT-061
IT-022 ↑ Traces Up SW-REQ-042	BMS PRECHARGE to NORMAL	Send state request + wait for precharge	BMS state changes to NORMAL (7)	SW-REQ-042 ↑ Traces Up STKH-REQ-006 SYS-REQ-092 SYS-REQ-100 SYS-REQ-101 SYS-REQ-102 TSR-006 ↓ Traces Down IT-022 IT-050 UT-030 UT-032
IT-023 ↑ Traces Up SW-REQ-041	BMS NORMAL to STANDBY	Send CAN 0x210 STANDBY request	BMS state changes to STANDBY (5)	SW-REQ-041 ↑ Traces Up STKH-REQ-006 STKH-REQ-020 SYS-REQ-072 SYS-REQ-091 ↓ Traces Down IT-001 IT-021 IT-023 IT-050 SSR-051 UT-030 UT-031 UT-061
IT-024 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +6 more	BMS any-state to ERROR	Inject fault condition (e.g., overvoltage)	BMS state changes to ERROR (9)	SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more
IT-025 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +7 more	BMS ERROR persistence	In ERROR, send NORMAL request	BMS remains in ERROR (dual condition required)	SW-REQ-045 ↑ Traces Up STKH-REQ-013 SYS-REQ-055 SYS-REQ-085 SYS-REQ-094 ↓ Traces Down IT-025 IT-038 SSR-022 SSR-023 SSR-024 UT-030 UT-035 UT-036

5.2 ASIL Test Suite (test_asil.py)

5.2.1 Safety Path Integration

ID	Test Case	Stimulus	Expected Result	Traces To
IT-030 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +13 more	Overvoltage MSL triggers ERROR	Inject cell voltage > 2800 mV via CAN 0x270 for 50+ evaluations	DIAG FATAL set; BMS enters ERROR; contactors open	SW-REQ-001 ↑ Traces Up STKH-REQ-007 SYS-REQ-020 TSR-001 ↓ Traces Down IT-010 IT-030 IT-036 SSR-001 UT-012 UT-015 UT-016 , SW-REQ-032 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-053 ↓ Traces Down IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 IT-037 +4 more , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more , SW-REQ-044 ↑ Traces Up STKH-REQ-011 STKH-REQ-013 SYS-REQ-006 SYS-REQ-015 SYS-REQ-054 SYS-REQ-084 SYS-REQ-095 SYS-REQ-103 +9 more ↓ Traces Down IT-030 IT-031 IT-050 IT-051 IT-052 IT-063 SSR-021 SSR-050 +4 more
IT-031 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +8 more	Undervoltage MSL triggers ERROR	Inject cell voltage < 1500 mV via CAN 0x270 for 50+ evaluations	DIAG FATAL set; BMS enters ERROR; contactors open	SW-REQ-002 ↑ Traces Up SYS-REQ-021 TSR-001 ↓ Traces Down IT-031 SSR-002 UT-013 UT-016 , SW-REQ-032 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-053 ↓ Traces Down IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 IT-037 +4 more , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more , SW-REQ-044 ↑ Traces Up STKH-REQ-011 STKH-REQ-013 SYS-REQ-006 SYS-REQ-015 SYS-REQ-054 SYS-REQ-084 SYS-REQ-095 SYS-REQ-103 +9 more ↓ Traces Down IT-030 IT-031 IT-050 IT-051 IT-052 IT-063 SSR-021 SSR-050 +4 more
IT-032 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +7 more	Overtemperature discharge MSL triggers ERROR	Inject temperature > 55 deg C via CAN 0x280 for 500+ evaluations	DIAG FATAL set; BMS enters ERROR	SW-REQ-020 ↑ Traces Up STKH-REQ-009 SYS-REQ-040 TSR-003 ↓ Traces Down IT-012 IT-032 IT-036 SSR-005 UT-018 UT-024 , SW-REQ-032 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-053 ↓ Traces Down IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 IT-037 +4 more , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more
IT-033 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +7 more	Undertemperature discharge MSL triggers ERROR	Inject temperature < -20 deg C via CAN 0x280 for 500+ evaluations	DIAG FATAL set; BMS enters ERROR	SW-REQ-021 ↑ Traces Up STKH-REQ-010 SYS-REQ-041 TSR-003 ↓ Traces Down IT-033 SSR-006 UT-019 UT-024 , SW-REQ-032 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-053 ↓ Traces Down IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 IT-037 +4 more , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more
IT-034 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +7 more	Overtemperature charge MSL triggers ERROR	Inject temperature > 45 deg C during charge	DIAG FATAL set; BMS enters ERROR	SW-REQ-022 ↑ Traces Up STKH-REQ-013 SYS-REQ-042 TSR-003 ↓ Traces Down IT-034 SSR-007 UT-020 UT-024 , SW-REQ-032 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-053 ↓ Traces Down IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 IT-037 +4 more , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more
IT-035 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +7 more	Undertemperature charge MSL triggers ERROR	Inject temperature < -20 deg C during charge	DIAG FATAL set; BMS enters ERROR	SW-REQ-023 ↑ Traces Up SYS-REQ-043 TSR-003 ↓ Traces Down IT-035 SSR-008 UT-021 UT-024 , SW-REQ-032 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-053 ↓ Traces Down IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 IT-037 +4 more , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more
IT-036 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +14 more	Discharge overcurrent MSL triggers ERROR	Inject current > 180000 mA for 10+ evaluations	DIAG FATAL set; BMS enters ERROR	SW-REQ-010 ↑ Traces Up STKH-REQ-008 SYS-REQ-030 TSR-002 ↓ Traces Down IT-011 IT-036 SSR-003 UT-016 UT-020 , SW-REQ-032 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-053 ↓ Traces Down IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 IT-037 +4 more , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more
IT-037 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +7 more	Charge overcurrent MSL triggers ERROR	Inject charge current > 180000 mA for 10+ evaluations	DIAG FATAL set; BMS enters ERROR	SW-REQ-011 ↑ Traces Up SYS-REQ-031 TSR-002 ↓ Traces Down IT-037 SSR-004 UT-017 UT-020 , SW-REQ-032 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-053 ↓ Traces Down IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 IT-037 +4 more , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more
IT-038 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +6 more	Deep discharge latches ERROR	Inject cell voltage <= 1500 mV	FATAL set with threshold=1; BMS enters ERROR; does not auto-clear	SW-REQ-005 ↑ Traces Up SYS-REQ-022 ↓ Traces Down IT-038 SSR-009 UT-014 UT-016 , SW-REQ-045 ↑ Traces Up STKH-REQ-013 SYS-REQ-055 SYS-REQ-085 SYS-REQ-094 ↓ Traces Down IT-025 IT-038 SSR-022 SSR-023 SSR-024 UT-030 UT-035 UT-036
IT-039 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +8 more	Current on open string triggers ERROR	Inject current > 200 mA with contactors open	DIAG FATAL set; BMS enters ERROR	SW-REQ-014 ↑ Traces Up SYS-REQ-013 ↓ Traces Down IT-039 SSR-010 UT-020 , SW-REQ-043 ↑ Traces Up STKH-REQ-006 SYS-REQ-073 SYS-REQ-093 ↓ Traces Down IT-024 IT-030 IT-031 IT-032 IT-033 IT-034 IT-035 IT-036 +5 more

5.2.2 Diagnostic Debounce Integration

ID	Test Case	Stimulus	Expected Result	Traces To
IT-040 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +10 more	Overvoltage below threshold count does not trigger ERROR	Inject overvoltage for 49 evaluations, then normal	BMS remains in current state; counter resets	SW-REQ-031 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-051 SYS-REQ-053 SYS-REQ-056 SYS-REQ-057 +3 more ↓ Traces Down IT-040 IT-041 IT-042 IT-061 SSR-032 SSR-033 UT-001 UT-002 +1 more , SW-REQ-033 ↑ Traces Up STKH-REQ-009 SYS-REQ-052 ↓ Traces Down IT-040 IT-041 SSR-031 UT-001 UT-004
IT-041 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +6 more	Temperature below threshold count does not trigger ERROR	Inject overtemp for 499 evaluations, then normal	BMS remains in current state	SW-REQ-031 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-051 SYS-REQ-053 SYS-REQ-056 SYS-REQ-057 +3 more ↓ Traces Down IT-040 IT-041 IT-042 IT-061 SSR-032 SSR-033 UT-001 UT-002 +1 more , SW-REQ-033 ↑ Traces Up STKH-REQ-009 SYS-REQ-052 ↓ Traces Down IT-040 IT-041 SSR-031 UT-001 UT-004
IT-042 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +5 more	Overcurrent reaches threshold quickly (10 events)	Inject overcurrent continuously	FATAL triggered after 10 events at 100 ms delay	SW-REQ-031 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-051 SYS-REQ-053 SYS-REQ-056 SYS-REQ-057 +3 more ↓ Traces Down IT-040 IT-041 IT-042 IT-061 SSR-032 SSR-033 UT-001 UT-002 +1 more

5.2.3 Contactor Integration

ID	Test Case	Stimulus	Expected Result	Traces To
IT-050 ↑ Traces Up STKH-REQ-011 STKH-REQ-013 SW-REQ-041 SW-REQ-042 SW-REQ-044 SYS-REQ-006 SYS-REQ-054	Precharge sequence closes correct contactors	Request NORMAL via CAN	Precharge + string- close; string+ closes after precharge	SW-REQ-041 ↑ Traces Up STKH-REQ-006 STKH-REQ-020 SYS-REQ-072 SYS-REQ-091 ↓ Traces Down IT-001 IT-021 IT-023 IT-050 SSR-051 UT-030 UT-031 UT-061 , SW-REQ-042 ↑ Traces Up STKH-REQ-006 SYS-REQ-092 SYS-REQ-100 SYS-REQ-101 SYS-REQ-102 TSR-006 ↓ Traces Down IT-022 IT-050 UT-030 UT-032
IT-051 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +8 more	ERROR opens all three contactors	Trigger FATAL event	String+, string-, precharge all commanded OPEN	SW-REQ-044 ↑ Traces Up STKH-REQ-011 STKH-REQ-013 SYS-REQ-006 SYS-REQ-015 SYS-REQ-054 SYS-REQ-084 SYS-REQ-095 SYS-REQ-103 +9 more ↓ Traces Down IT-030 IT-031 IT-050 IT-051 IT-052 IT-063 SSR-021 SSR-050 +4 more
IT-052 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +4 more	Contactor feedback mismatch detected	Simulate feedback mismatch (via stub)	DIAG reports contactor feedback event	SW-REQ-044 ↑ Traces Up STKH-REQ-011 STKH-REQ-013 SYS-REQ-006 SYS-REQ-015 SYS-REQ-054 SYS-REQ-084 SYS-REQ-095 SYS-REQ-103 +9 more ↓ Traces Down IT-030 IT-031 IT-050 IT-051 IT-052 IT-063 SSR-021 SSR-050 +4 more

5.3 SIL Probe Test Suite (test_sil_probes.py)

ID	Test Case	Stimulus	Expected Result	Traces To
IT-060 ↑ Traces Up SW-REQ-060 SYS-REQ-050 SYS-REQ-071	Database entry write observed	Write known value to database entry	SIL probe reads matching value	SW-REQ-060 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SYS-REQ-060 TSR-015 ↓ Traces Down IT-010 IT-013 IT-060 UT-040 UT-042
IT-061 ↑ Traces Up SW-REQ-031	DIAG counter observable	Trigger diagnostic event	SIL probe reads incremented counter	SW-REQ-031 ↑ Traces Up STKH-REQ-009 STKH-REQ-011 STKH-REQ-012 STKH-REQ-017 SYS-REQ-051 SYS-REQ-053 SYS-REQ-056 SYS-REQ-057 +3 more ↓ Traces Down IT-040 IT-041 IT-042 IT-061 SSR-032 SSR-033 UT-001 UT-002 +1 more
IT-062 ↑ Traces Up SW-REQ-040	BMS state observable	Trigger state transition	SIL probe reads new state value	SW-REQ-040 ↑ Traces Up STKH-REQ-005 STKH-REQ-006 STKH-REQ-019 SYS-REQ-071 SYS-REQ-090 ↓ Traces Down IT-001 IT-014 IT-062 UT-030 UT-102
IT-063 ↑ Traces Up SW-REQ-044	Contactor state observable	Command contactor state	SIL probe reads commanded state	SW-REQ-044 ↑ Traces Up STKH-REQ-011 STKH-REQ-013 SYS-REQ-006 SYS-REQ-015 SYS-REQ-054 SYS-REQ-084 SYS-REQ-095 SYS-REQ-103 +9 more ↓ Traces Down IT-030 IT-031 IT-050 IT-051 IT-052 IT-063 SSR-021 SSR-050 +4 more

6. Integration Strategy

6.1 Integration Order

Integration follows a bottom-up approach:

Level 1: HAL stubs + Driver layer (CAN via SocketCAN, SPI/I2C stubs)
Level 2: Engine layer (Database, DIAG) on top of drivers
Level 3: Application layer (SOA, BMS, Algorithm) on top of engine
Level 4: Full system integration with CAN stimulus

6.2 Integration Criteria

Level	Entry Criteria	Exit Criteria
Level 1	HAL stubs compile, driver unit tests pass	IT-001 ↑ Traces Up STKH-REQ-005 STKH-REQ-006 STKH-REQ-019 SW-REQ-040 SW-REQ-041 SW-REQ-100 SYS-REQ-060 SYS-REQ-061 +2 more through IT-008 ↑ Traces Up SW-REQ-100 pass
Level 2	Level 1 exit, engine unit tests pass	IT-010 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SW-REQ-001 SW-REQ-060 SW-REQ-062 SYS-REQ-001 SYS-REQ-002 SYS-REQ-003 +4 more through IT-014 ↑ Traces Up SW-REQ-040 SW-REQ-090 pass
Level 3	Level 2 exit, application unit tests pass	IT-020 ↑ Traces Up SW-REQ-050 SW-REQ-053 SYS-REQ-070 SYS-REQ-073 SYS-REQ-081 through IT-025 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +7 more pass
Level 4	Level 3 exit	IT-030 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +13 more through IT-063 ↑ Traces Up SW-REQ-044 all pass

7. Pass/Fail Criteria

All integration tests shall pass with zero failures.
No test shall cause a crash, segfault, or timeout.
CAN message timing shall be within 20% of specified periods.
State transitions shall occur within 500 ms of stimulus injection.

Traceability: SW-REQ to Integration Test

SW-REQ	Verified By	Description
SW-REQ-001 ↑ Traces Up STKH-REQ-007 SYS-REQ-020 TSR-001 ↓ Traces Down IT-010 IT-030 IT-036 SSR-001 UT-012 UT-015 UT-016	IT-036 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +14 more	Voltage check integration
SW-REQ-010 ↑ Traces Up STKH-REQ-008 SYS-REQ-030 TSR-002 ↓ Traces Down IT-011 IT-036 SSR-003 UT-016 UT-020	IT-036 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +14 more	Voltage check integration
SW-REQ-020 ↑ Traces Up STKH-REQ-009 SYS-REQ-040 TSR-003 ↓ Traces Down IT-012 IT-032 IT-036 SSR-005 UT-018 UT-024	IT-036 ↑ Traces Up HZ-001 HZ-002 HZ-003 HZ-004 HZ-005 HZ-006 HZ-007 HZ-008 +14 more	Voltage check integration
SW-REQ-040 ↑ Traces Up STKH-REQ-005 STKH-REQ-006 STKH-REQ-019 SYS-REQ-071 SYS-REQ-090 ↓ Traces Down IT-001 IT-014 IT-062 UT-030 UT-102	IT-001 ↑ Traces Up STKH-REQ-005 STKH-REQ-006 STKH-REQ-019 SW-REQ-040 SW-REQ-041 SW-REQ-100 SYS-REQ-060 SYS-REQ-061 +2 more	State machine integration
SW-REQ-044 ↑ Traces Up STKH-REQ-011 STKH-REQ-013 SYS-REQ-006 SYS-REQ-015 SYS-REQ-054 SYS-REQ-084 SYS-REQ-095 SYS-REQ-103 +9 more ↓ Traces Down IT-030 IT-031 IT-050 IT-051 IT-052 IT-063 SSR-021 SSR-050 +4 more	IT-050 ↑ Traces Up STKH-REQ-011 STKH-REQ-013 SW-REQ-041 SW-REQ-042 SW-REQ-044 SYS-REQ-006 SYS-REQ-054	Contactor integration
SW-REQ-060 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SYS-REQ-060 TSR-015 ↓ Traces Down IT-010 IT-013 IT-060 UT-040 UT-042	IT-010 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SW-REQ-001 SW-REQ-060 SW-REQ-062 SYS-REQ-001 SYS-REQ-002 SYS-REQ-003 +4 more	Database integration
SW-REQ-070 ↑ Traces Up STKH-REQ-005 STKH-REQ-008 SYS-REQ-010 SYS-REQ-012 SYS-REQ-130 TSR-013 ↓ Traces Down IT-011 UT-070	IT-011 ↑ Traces Up STKH-REQ-005 STKH-REQ-008 SW-REQ-010 SW-REQ-062 SW-REQ-070 SYS-REQ-010 SYS-REQ-011 SYS-REQ-012	SOC integration
SW-REQ-090 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 SYS-REQ-060 SYS-REQ-069 SYS-REQ-086 ↓ Traces Down IT-002 IT-007 IT-014 UT-050 UT-052 UT-103	IT-002 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 STKH-REQ-015 STKH-REQ-018 SW-REQ-090 SW-REQ-091 SW-REQ-100 SW-REQ-101 +2 more	CAN TX integration
SW-REQ-100 ↑ Traces Up STKH-REQ-007 STKH-REQ-015 STKH-REQ-018 SYS-REQ-061 SYS-REQ-070 ↓ Traces Down IT-001 IT-002 IT-008 IT-013 UT-051 UT-052	IT-002 ↑ Traces Up STKH-REQ-007 STKH-REQ-014 STKH-REQ-015 STKH-REQ-018 SW-REQ-090 SW-REQ-091 SW-REQ-100 SW-REQ-101 +2 more	CAN RX integration

End of Document

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