Verification & Test Plan

Verification Strategy

Need: (TEST) Verification shall demonstrate that :need:`REQ_SAFETY_001`, :need:`REQ_SAFETY_002`, :need:`REQ_SAFETY_003`, and all functional requirements are met through unit tests and integration tests. TEST_VERIFY_001

status: active tags: v&v, strategy links outgoing: REQ_SAFETY_001, REQ_SAFETY_002, REQ_SAFETY_003, REQ_FUNC_001, REQ_FUNC_002, REQ_FUNC_003, REQ_FUNC_004

Test Methods Overview

Need: (TEST) Unit tests shall verify individual components (:need:`ARCH_FUNC_001` Sensor Driver, :need:`ARCH_FUNC_002` Filter, :need:`ARCH_FUNC_003` State Machine) in isolation. TEST_METHOD_001

status: active tags: unit-test links outgoing: ARCH_FUNC_001, ARCH_FUNC_002, ARCH_FUNC_003 links incoming: TEST_METHOD_002

Need: (TEST) Integration tests shall verify end-to-end data flow from sensor input to state output (:need:`ARCH_001` TSIM). TEST_METHOD_002

status: active tags: integration-test links outgoing: TEST_METHOD_001, ARCH_001

Need: (TEST) Timing tests shall verify that all processing occurs within 100ms as specified in :need:`REQ_SAFETY_002`. TEST_METHOD_003

status: active tags: timing-test links outgoing: REQ_SAFETY_002, ARCH_FUNC_003 links incoming: TEST_END_TO_END_001

Unit Test Cases

Need: (TEST) TEST_CONVERSION_001: Sensor readings across full range (-40°C to +125°C) shall convert correctly per :need:`REQ_FUNC_001`. TEST_CONVERSION_001

status: active tags: unit-test, sensor-driver links outgoing: REQ_FUNC_001, ARCH_FUNC_001, ARCH_SIGNAL_001 links incoming: TEST_CODE_001

Test Steps: Input ADC values: 0, 1024, 2048, 3072, 4095 LSB Verify output temperature: -40°C, -17.5°C, 42.5°C, 102.5°C, ~125°C Pass Criteria: All conversions within ±1°C accuracy Architecture: (ARCH) The Sensor Driver sh... (ARCH_FUNC_001), (ARCH) Raw Temperature Sign... (ARCH_SIGNAL_001)

Need: (TEST) TEST_FILTER_001: Noise filtering with 5-sample moving average shall suppress sensor noise per :need:`REQ_FUNC_002`. TEST_FILTER_001

status: active tags: unit-test, filter links outgoing: REQ_FUNC_002, ARCH_FUNC_002, ARCH_SIGNAL_002 links incoming: TEST_CODE_001

Test Steps: Input noisy sequence: [50, 60, 45, 55, 50, 48, 52, 49]°C After 5 samples, filter output shall stabilize around 50°C Pass Criteria: Noise amplitude reduced by ≥80% Architecture: (ARCH) The Temperature Filt... (ARCH_FUNC_002), (ARCH) Temperature Reading ... (ARCH_SIGNAL_002)

Need: (TEST) TEST_THRESHOLD_001: State machine shall transition to UNSAFE when temperature ≥ 100°C per :need:`REQ_FUNC_003`. TEST_THRESHOLD_001

status: active tags: unit-test, state-machine links outgoing: REQ_FUNC_003, REQ_SAFETY_002, ARCH_FUNC_003, ARCH_DESIGN_001 links incoming: TEST_CODE_001

Test Steps: Set initial state: SAFE (T=50°C) Inject temperature: 100°C Verify state output: UNSAFE Pass Criteria: State transition occurs on first call after threshold exceeded Architecture: (ARCH) The State Machine sh... (ARCH_FUNC_003), (ARCH) Temperature monitori... (ARCH_DESIGN_001)

Need: (TEST) TEST_HYSTERESIS_001: State machine shall transition to SAFE only when temperature ≤ 95°C (hysteresis) per :need:`REQ_FUNC_004`. TEST_HYSTERESIS_001

status: active tags: unit-test, state-machine, hysteresis links outgoing: REQ_FUNC_004, REQ_SAFETY_003, ARCH_DESIGN_001 links incoming: TEST_CODE_001

Test Steps: Set state: UNSAFE (T=100°C) Lower temperature to 99°C (still below hysteresis) → state remains UNSAFE Lower temperature to 95°C → state transitions to SAFE Pass Criteria: Hysteresis deadband prevents spurious oscillations

Integration Test Cases

Need: (TEST) TEST_END_TO_END_001: Full sensor-to-state pipeline shall operate within latency budget per :need:`REQ_SAFETY_002`. TEST_END_TO_END_001

status: active tags: integration-test, timing links outgoing: REQ_SAFETY_002, ARCH_001, ARCH_FUNC_003, TEST_METHOD_003 links incoming: TEST_CODE_001

Test Steps: Simulate analog sensor input ramping from 25°C to 105°C Measure time from input change to state output change Pass Criteria: End-to-end latency ≤ 50ms (margin within 100ms requirement) Architecture: (ARCH) The Thermal Sensor I... (ARCH_001), (ARCH) The State Machine sh... (ARCH_FUNC_003)

Need: (TEST) TEST_ERROR_RECOVERY_001: Module shall recover gracefully from persistent sensor errors per :need:`ARCH_ERROR_001`. TEST_ERROR_RECOVERY_001

status: active tags: integration-test, error-handling links outgoing: ARCH_ERROR_001, REQ_SAFETY_001

Test Steps: Inject invalid readings (<-50°C or >150°C range) Verify state remains unchanged for up to 9 errors Inject valid reading; verify normal operation resumes Pass Criteria: State unchanged during error sequence; recovery successful Architecture: (ARCH) If sensor reading is... (ARCH_ERROR_001)

Need: (TEST) TEST_FAIL_SAFE_001: After 10 consecutive sensor failures, module shall enter UNSAFE state per :need:`ARCH_ERROR_002`. TEST_FAIL_SAFE_001

status: active tags: integration-test, fail-safe, safety links outgoing: ARCH_ERROR_002, REQ_SAFETY_002, REQ_SAFETY_003

Test Steps: Inject 10 consecutive invalid readings Verify state transitions to UNSAFE Confirm recovery pathway when valid readings resume Pass Criteria: UNSAFE state triggered; system alerts integrating system Architecture: (ARCH) The module shall tra... (ARCH_ERROR_002), (ARCH) The TSIM shall be a ... (ARCH_SEOOC_001)

Traceability Matrix

Complete Requirements-to-Test Traceability - Architecture: (ARCH) The Thermal Sensor I... (ARCH_001) | Safety: (SG) Prevent thermal damage... (REQ_SAFETY_001), (SR) The system shall detec... (REQ_SAFETY_002), (SR) The system shall repor... (REQ_SAFETY_003)

Detailed Traceability Table

Requirements to Test Coverage

Requirement	Test Case	Status	Coverage Notes
(SG) Prevent thermal damage... (REQ_SAFETY_001)	(TEST) TEST_THRESHOLD_001: ... (TEST_THRESHOLD_001)	Active	Safety goal foundation
(SR) The system shall detec... (REQ_SAFETY_002)	(TEST) TEST_THRESHOLD_001: ... (TEST_THRESHOLD_001), (TEST) TEST_END_TO_END_001:... (TEST_END_TO_END_001)	Active	Detects & reports within 100ms
(SR) The system shall repor... (REQ_SAFETY_003)	(TEST) TEST_HYSTERESIS_001:... (TEST_HYSTERESIS_001), (TEST) TEST_FAIL_SAFE_001: ... (TEST_FAIL_SAFE_001)	Active	Recovery & fail-safe behavior
(FR) The module shall read ... (REQ_FUNC_001)	(TEST) TEST_CONVERSION_001:... (TEST_CONVERSION_001)	Active	Sensor reading accuracy (-40 to +125°C)
(FR) The module shall filte... (REQ_FUNC_002)	(TEST) TEST_FILTER_001: Noi... (TEST_FILTER_001)	Active	Noise filtering (≥80% reduction)
(FR) The module shall trigg... (REQ_FUNC_003)	(TEST) TEST_THRESHOLD_001: ... (TEST_THRESHOLD_001)	Active	Threshold detection at 100°C
(FR) The module shall trigg... (REQ_FUNC_004)	(TEST) TEST_HYSTERESIS_001:... (TEST_HYSTERESIS_001)	Active	Hysteresis deadband (95°C recovery)
(ARCH) The Sensor Driver sh... (ARCH_FUNC_001)	(TEST) TEST_CONVERSION_001:... (TEST_CONVERSION_001)	Active	100Hz sampling implementation
(ARCH) The Temperature Filt... (ARCH_FUNC_002)	(TEST) TEST_FILTER_001: Noi... (TEST_FILTER_001)	Active	5-sample moving average
(ARCH) The State Machine sh... (ARCH_FUNC_003)	(TEST) TEST_THRESHOLD_001: ... (TEST_THRESHOLD_001), (TEST) TEST_HYSTERESIS_001:... (TEST_HYSTERESIS_001)	Active	State machine logic
(ARCH) Temperature monitori... (ARCH_DESIGN_001)	(TEST) TEST_THRESHOLD_001: ... (TEST_THRESHOLD_001), (TEST) TEST_HYSTERESIS_001:... (TEST_HYSTERESIS_001)	Active	Hysteresis state machine
(ARCH) The module shall tra... (ARCH_ERROR_002)	(TEST) TEST_FAIL_SAFE_001: ... (TEST_FAIL_SAFE_001)	Active	Fail-safe error handling

Test Execution & Reporting

Need: (TEST) All unit tests shall execute in ≤ 1 second; integration tests in ≤ 5 seconds. TEST_EXEC_001

status: active tags: performance, ci-cd

Need: (TEST) Test results shall be exported in JUnit XML format for traceability reporting via sphinx-test-reports. TEST_REPORT_001

status: active tags: reporting, artifact

Integration: Configure sphinx-test-reports in conf.py to import test results into this documentation for automated compliance artifact generation.