Test Plan Development for Project
1:38
Running design review.
Reviewing the bill of materials.
Analyzing the schematic.
Analyzing the PCB layout.
Refining answer requirements.
Clarifying design state issues.
Comprehensive Test Plan - Flux Capacitor Project V1.1
2) Test Objectives Primary objectives
3) Requirements to Validate
4) Test Environment Setup
Board setup
5) Test Categories and Detailed Test Cases
7) Automation Strategy What to automate first
Automation priorities
9) Recommended Pass/Fail Flow Prototype bring-up gate
11) Minimal First-Pass Test Sequence for This Project
This test plan is based on the project’s current state: a 75-component / 20-net schematic, a 2-layer PCB, and a 50 mm x 60 mm rectangular layout with 10 mm corner radius. Current automated checks show no missing footprints and no airwires, but there are 31 floating-pin ERC errors, so verification should treat schematic cleanup as part of test readiness. For project analysis, it is important to document the design as it exists now and use concrete values and observed behavior, not assumptions
1) Test Scope
In scope
- Power-path behavior
- Logic/control behavior
- LED output behavior
- Switch/input behavior
- Programming/interface behavior
- PCB manufacturability and basic physical robustness
- Thermal rise under steady operation
- Environmental robustness for storage and light functional operation
- Pre-production validation and regression retest
- Regulatory certification
- Long-term field reliability modeling
- EMC pre-compliance beyond basic functional sanity checks
- Any performance claim requiring specs not yet defined in the project description
2) Test Objectives Primary objectives
- Confirm the board powers up safely and repeatably
- Verify all intended outputs and inputs function correctly
- Confirm the PCB can be assembled, programmed, and operated without electrical faults
- Detect latent issues related to floating nodes, unstable power, solder defects, or thermal stress
- Establish pass/fail criteria suitable for prototype bring-up and later production screening
- Build a reusable regression checklist
- Identify design weak points before additional spins
- Improve confidence in reliability across supply, temperature, and handling variation
3) Requirements to Validate
Functional requirements
| ID | Requirement | Validation Method |
|---|---|---|
| F1 | Board powers on from intended source without damage | Bring-up, current monitoring |
| F2 | Logic/control section starts consistently | Power-cycle and programming tests |
| F3 | Visual outputs behave as intended | Functional output test |
| F4 | User input/switching changes behavior correctly | Input stimulus test |
| F5 | Programming/debug interface is usable | Interface/programming test |
| F6 | All intended nets are electrically continuous | Continuity and resistance checks |
Non-functional requirements
| ID | Requirement | Validation Method |
|---|---|---|
| N1 | No excessive current draw in idle or active states | Power profiling |
| N2 | No component exceeds safe operating temperature in normal use | Thermal test |
| N3 | PCB survives normal handling and installation | Mechanical inspection and stress |
| N4 | Board remains functional after environmental exposure | Environmental test |
| N5 | Assembly is manufacturable and repeatable | DFM/assembly inspection |
| N6 | Design is free of unresolved critical ERC/DRC issues before release | Review gate |
4) Test Environment Setup
Bench equipment
| Equipment | Purpose |
|---|---|
| Bench power supply with current limit | Safe bring-up |
| Digital multimeter | Voltage, continuity, resistance |
| Oscilloscope | Supply stability, switching, signal timing |
| Logic analyzer | Digital behavior and interface timing |
| IR camera or thermocouple | Thermal characterization |
| ISP/programming tool | Programming and verification |
| Magnification microscope | Solder and assembly inspection |
| ESD-safe workstation | Safe handling |
| Environmental chamber if available | Temperature/humidity stress |
- Test at room ambient first: 23 C to 27 C
- Use current-limited supply for first power-up
- Record board revision, firmware version, and any rework status
- If multiple prototypes exist, assign serial IDs and test all units
- No airwires
- No missing footprints
- ERC floating-pin issues reviewed and either resolved or formally waived
- Firmware image frozen for test campaign
- Power input polarity and expected supply range documented
5) Test Categories and Detailed Test Cases
A. Electrical Testing
| TC ID | Test Case | Procedure | Expected Outcome | Pass/Fail Criteria |
|---|---|---|---|---|
| E-01 | Visual pre-power inspection | Inspect polarity, solder bridges, tombstones, connector orientation, damaged pads | No visible assembly defects | Pass if no defect likely to cause short/open |
| E-02 | Power-to-ground resistance | Measure input rail to ground before power-up | Finite resistance, not near-short | Pass if resistance is consistent with design and not indicative of a short |
| E-03 | First power-up current limit | Power with low current limit and monitor current | No latch-up, no sudden overcurrent | Pass if current stays below set safe threshold and board remains stable |
| E-04 | Steady-state input current | Measure current after startup | Stable, repeatable current draw | Pass if within expected operating window defined during characterization |
| E-05 | Rail voltage accuracy | Measure all supply nodes | Rails within tolerance | Pass if each rail is within +/- 5% of target unless tighter limit is later defined |
| E-06 | Power-cycle repeatability | Cycle power 50 times | Reliable startup every cycle | Pass if zero failed boots |
| E-07 | Brownout behavior | Ramp supply down/up slowly | Predictable reset or shutdown | Pass if no latch-up, corruption, or excessive current |
| E-08 | Output continuity | Validate each output path electrically | All expected paths connected | Pass if continuity matches schematic intent |
| E-09 | Idle ripple/noise | Probe supply rails with scope | No abnormal ripple/oscillation | Pass if ripple is stable and no sustained oscillation is observed |
| E-10 | Input debounce/stability | Toggle switch/input repeatedly | Clean response, no chatter-induced malfunction | Pass if no missed or false events beyond agreed limit |
| E-11 | LED channel validation | Exercise all visible outputs one by one and in pattern mode | Correct channels activate with correct polarity | Pass if every channel behaves correctly |
| E-12 | Fault current check | Test safe response to brief abnormal operating condition where practical | No catastrophic failure | Pass if board recovers and no damage occurs |
B. Communication & Interface Testing
| TC ID | Test Case | Procedure | Expected Outcome | Pass/Fail Criteria |
|---|---|---|---|---|
| I-01 | Programming interface connectivity | Connect programmer and detect target | Target is recognized reliably | Pass if detection succeeds on 3/3 attempts |
| I-02 | Firmware flash and verify | Program image and verify contents | Successful write/verify | Pass if verify is clean with zero retries required beyond normal tool behavior |
| I-03 | Reset/programming sequence | Test reset entry and reprogram cycle | Consistent programming access | Pass if repeated programming succeeds |
| I-04 | Interface signal integrity | Check clock/data lines during programming | Clean levels, no stuck lines | Pass if levels meet logic thresholds and transactions complete |
| I-05 | Recovery after interrupted programming | Interrupt one programming cycle safely, then retry | Board remains recoverable | Pass if successful reflash restores operation |
C. Functional Testing
| TC ID | Test Case | Procedure | Expected Outcome | Pass/Fail Criteria |
|---|---|---|---|---|
| F-01 | Basic startup behavior | Apply power and observe behavior | Intended startup sequence occurs | Pass if startup result matches defined behavior every time |
| F-02 | Normal operating mode | Run intended primary function for 30 min | Stable operation | Pass if no reset, lockup, or visible malfunction |
| F-03 | User interaction | Operate switch through all expected states | Device responds correctly | Pass if all states are reachable and repeatable |
| F-04 | Output pattern endurance | Run output sequence continuously for 4 hr | No drift or failure | Pass if functionality remains correct throughout |
| F-05 | Simultaneous activity stress | Drive outputs while exercising inputs/programming-safe functions | No interference or unstable behavior | Pass if no missed events, resets, or corrupted operation |
D. Thermal Testing
| TC ID | Test Case | Procedure | Expected Outcome | Pass/Fail Criteria |
|---|---|---|---|---|
| T-01 | Room-temperature thermal map | Run normal mode for 30 min and capture temperatures | Hotspots identified, stable temperatures | Pass if no component exceeds its rated temperature limit |
| T-02 | Worst-case power thermal run | Operate in highest-current realistic condition for 1 hr | Temperature reaches steady state safely | Pass if junction/case estimates remain below rated limits with margin |
| T-03 | Enclosure-like airflow restriction | Repeat thermal run with reduced airflow if enclosure is planned | Predictable temperature rise | Pass if still below allowable limit |
| T-04 | Hot restart | Run hot, power-cycle, restart | Normal restart from warm condition | Pass if startup remains reliable |
E. Mechanical Testing
| TC ID | Test Case | Procedure | Expected Outcome | Pass/Fail Criteria |
|---|---|---|---|---|
| M-01 | Dimensional inspection | Measure board outline and key clearances | PCB matches fabrication intent | Pass if critical dimensions are within fab tolerance |
| M-02 | Connector/programmer mating | Insert and remove cable/programmer repeatedly | No pad lift, no intermittent contact | Pass if 20 cycles complete without damage |
| M-03 | Switch actuation life screening | Actuate switch repeatedly | Stable mechanical function | Pass if no sticking or intermittent response after 200 cycles |
| M-04 | Handling robustness | Gentle manual handling and fixture mounting | No cracked joints or detached parts | Pass if post-test inspection and function are clean |
| M-05 | Battery/contact retention if applicable | Check retention/contact pressure during movement | Reliable contact | Pass if no unintended disconnect |
F. Environmental Testing
| TC ID | Test Case | Procedure | Expected Outcome | Pass/Fail Criteria |
|---|---|---|---|---|
| ENV-01 | Cold functional test | Test at low ambient, e.g. 0 C or project target | Board starts and runs | Pass if full functionality is maintained |
| ENV-02 | Hot functional test | Test at high ambient, e.g. 50 C or project target | Board starts and runs | Pass if full functionality is maintained |
| ENV-03 | Thermal cycling | Cycle between low/high ambient 10 times | No latent failures | Pass if function before/after is identical |
| ENV-04 | Humidity exposure | Expose to moderate humidity soak if available | No corrosion-related or leakage-related malfunction | Pass if behavior remains normal after stabilization |
| ENV-05 | ESD handling check | Basic controlled ESD handling evaluation | No permanent damage from normal handling exposure | Pass if no reset or failure outside acceptable handling limits |
G. Manufacturing / Reliability Gate Tests
| TC ID | Test Case | Procedure | Expected Outcome | Pass/Fail Criteria |
|---|---|---|---|---|
| R-01 | Schematic/layout review gate | Review open ERC/DRC findings | No unresolved critical issues | Fail if critical review issues remain unresolved |
| R-02 | Assembly repeatability | Test multiple assembled units | Similar current, voltages, and function | Pass if unit-to-unit spread is acceptable |
| R-03 | Burn-in | Operate for 12 hr to 24 hr | No infant mortality failures | Pass if unit remains fully functional |
| R-04 | Regression after rework | Retest repaired units | No degradation after rework | Pass if all prior critical tests still pass |
6) Edge Cases to Include
| Edge Case | Why It Matters |
|---|---|
| Minimum input voltage at startup | Finds brownout sensitivity |
| Maximum allowed input voltage | Verifies safe margin |
| Rapid power toggling | Finds reset or latch-up issues |
| Power applied with switch active | Checks startup-state handling |
| Programming attempt during unusual board state | Checks recovery robustness |
| Cold start after long unpowered storage | Reveals weak contacts or startup issues |
| Long-duration operation | Reveals thermal drift and intermittent faults |
| Multiple outputs active simultaneously | Finds aggregate current issues |
| Open or intermittent external connection | Checks fault tolerance |
7) Automation Strategy What to automate first
- Power-cycle testing
- Rail-voltage logging
- Current-consumption logging
- Functional output sequence verification
- Programmer connect/flash/verify loops
- Regression result capture
Suggested automation stack
| Layer | Recommendation |
|---|---|
| Instrument control | Python with SCPI for PSU, DMM, scope |
| Functional sequencing | USB relay / GPIO test controller |
| Result logging | CSV or SQLite with per-board serial number |
| Regression | One-button script for bring-up and flash verification |
| Reporting | Auto-generated pass/fail summary and trend plots |
- Safe power-up script with current-limit enforcement
- Repeated startup and flash verification
- Current/voltage trend logging over time
- Thermal logging during endurance tests
8) Risks and Failure Modes
| Risk | Likely Effect | Mitigation |
|---|---|---|
| Floating nodes already seen in ERC | Unpredictable logic or false failures | Resolve or document before formal test |
| Unknown current budget | Overstress during bring-up | Use current-limited supply and characterize gradually |
| Thermal hotspots on dense LED/output regions | Reduced life or intermittent behavior | IR scan under worst-case load |
| Connector or battery contact intermittency | Random resets | Mechanical retention and contact testing |
| Incomplete requirements definition | Ambiguous pass/fail outcomes | Freeze measurable acceptance criteria before signoff |
| Prototype-only workmanship variation | False negatives | Test more than one assembled board |
9) Recommended Pass/Fail Flow Prototype bring-up gate
- E-01 through E-06
- I-01 through I-03
- F-01 through F-03
- All electrical, interface, and functional cases
- T-01 and T-02
- M-01 and M-02
- Burn-in
- Thermal cycling
- Repeated power-cycle testing
- Multi-unit comparison
A board should not advance to reliability testing until:
- No critical shorts/overcurrent behavior exist
- Rail measurements are stable
- Programming is repeatable
- Open critical ERC findings are dispositioned
10) Recommendations to Improve Test Coverage
| Recommendation | Benefit |
|---|---|
| Define explicit nominal and min/max supply limits | Makes power tests objective |
| Add a current budget table | Enables meaningful pass/fail thresholds |
| Add labeled test points on key rails/signals in next revision | Faster debug and production screening |
| Resolve current floating-pin findings before final validation | Reduces ambiguous failures |
| Document intended LED behavior/state table | Makes output testing deterministic |
| Create a golden-board reference dataset | Enables unit-to-unit comparison |
| Run at least 3 boards through the same plan | Better confidence in repeatability |
| Add a simple automated production smoke test | Shortens future screening time |
11) Minimal First-Pass Test Sequence for This Project
If you want the fastest practical first validation pass, do this:
- Visual inspection and resistance-to-ground check
- Current-limited first power-up
- Measure all rails
- Verify programming interface works
- Run basic functional/output test
- Power-cycle 50 times
- Run 30 min thermal soak
- Recheck function
- Review and resolve the existing floating-pin ERC issues
- Repeat on at least one more assembled unit
12) Suggested Deliverables
| Deliverable | Purpose |
|---|---|
| Test matrix spreadsheet | Track status by case and by unit |
| Bring-up checklist | Safe first-power procedure |
| Automated bench script | Repeatable regression |
| Thermal image set | Document hotspots |
| Final validation report | Signoff evidence |
If you want, I can turn this into a production-ready test matrix table with columns for owner, priority, setup, measured values, status, and notes.
Create test matrix
Tailor to this board
Add measurable limits
Focus on ERC issues
31 days
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