STD: WDCLS Invert Sigmoid Rule (WDCLSINVSIG)

Version: v1.0.0 Status: Draft SRS Source: docusaurus/docs/srs/rules/rule-wdcls-invert-sigmoid.md Rule Name: WDCLS_INVERT_SIGMOID_POS Domain: RULES-WDCLSINVSIG

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Overview

This document specifies tests for the WDCLS Invert Sigmoid rule using decision tables and test vectors. The rule validates CLS (classification) discrepancies between DXAI and machine classifications while considering sigmoid curve patterns, applying intelligent skip conditions.

Rule Characteristics:

• Pure business logic (no UI)
• Three skip conditions evaluated in order: minimum fluorescence, max CT, sigmoid pattern
• Sigmoid direction determination from readings array
• Shared configuration with WDCLS/C Rules

Test Method: TM-API (per Test Plan Section 3.3 - Rules use automated API tests)

Verification Approach: Rule verification is performed using data-driven test vectors. Each row in a decision table represents a complete verification scenario with defined inputs and expected outputs. This format enables exhaustive condition coverage while remaining concise and auditable.

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Coverage Summary

REQ ID	Title	Conditions	Test Vectors	Coverage	Gaps
REQ-RULES-WDCLSINVSIG-001	Sigmoid Pattern Skip	6	8	100%	None
REQ-RULES-WDCLSINVSIG-002	CT Threshold Skip	4	5	100%	None
REQ-RULES-WDCLSINVSIG-003	Min Fluorescence Skip	3	4	100%	None

Totals: 3 REQs, 13 Conditions, 17 Test Vectors, 100% Coverage

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Input Variables

Variable	Type	Valid Values	Description
dxai_cls	string	Pos, Neg	DXAI classification
machine_cls	string	Pos, Neg	Machine classification
final_cls	string	Positive, Negative	Final resolved classification
sigmoid_direction	string	Upward, Downward, None	Sigmoid curve pattern
readings_count	int	0..n	Number of readings in observation
final_ct	float	numeric	Observation CT value
max_ct_for_cls_discrepancy	float?	null, numeric	Config: Maximum CT threshold
max_reading	float	numeric	Maximum value in readings array
minimum_fluorescence_to_positive	float	numeric	Config: Min fluorescence threshold

Output Variables

Variable	Type	Description
rule_skipped	bool	Whether the rule was skipped entirely
error_applied	bool	Whether CLS discrepancy error was applied
skip_reason	string?	Reason for skip (Low Fluorescence, High CT, Valid Invert Pattern)

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REQ-RULES-WDCLSINVSIG-001: Sigmoid Pattern Skip Condition

Precondition

All test vectors in this section assume:

• dxai_cls != machine_cls (discrepancy exists)
• max_reading >= minimum_fluorescence_to_positive (fluorescence check passed)
• final_ct < max_ct_for_cls_discrepancy OR max_ct_for_cls_discrepancy = null (CT check passed)

Decision Table: Sigmoid and Classification Combinations

TV	sigmoid_direction	final_cls	error_applied	skip_reason	Covers
TV-001-001	Downward	Negative	false	Valid Invert Pattern	AC: Downward + Negative = skip
TV-001-002	Downward	Positive	true	null	AC: Downward + Positive = error
TV-001-003	Upward	Negative	true	null	AC: Upward + Negative = error
TV-001-004	Upward	Positive	true	null	AC: Upward + Positive = error

Decision Table: Sigmoid Direction Determination

TV	readings_count	middle_value	penultimate_value	sigmoid_direction	Covers
TV-001-005	4	100	80	Downward	AC: middle > penultimate
TV-001-006	4	80	100	Upward	AC: middle < penultimate
TV-001-007	4	100	100	None	AC: middle == penultimate
TV-001-008	3	-	-	None	AC: readings < 4 = indeterminate

Automation Status

Test Vector Range	Status	Notes
TV-001-001 to TV-001-008	Automated	Data-driven parameterized tests

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REQ-RULES-WDCLSINVSIG-002: CT Threshold Skip Condition

Precondition

All test vectors in this section assume:

• dxai_cls != machine_cls (discrepancy exists)
• max_reading >= minimum_fluorescence_to_positive (fluorescence check passed)

Decision Table: CT Threshold Comparison

TV	max_ct_for_cls_discrepancy	final_ct	rule_skipped	skip_reason	Covers
TV-002-001	null	36	false	null	AC: Null config = proceed
TV-002-002	35	36	true	High CT	AC: final_ct > threshold = skip
TV-002-003	36	36	true	High CT	AC: final_ct == threshold = skip
TV-002-004	37	36	false	null	AC: final_ct < threshold = proceed
TV-002-005	35	34.99	false	null	AC: Boundary - just below threshold

Automation Status

Test Vector Range	Status	Notes
TV-002-001 to TV-002-005	Automated	Data-driven parameterized tests

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REQ-RULES-WDCLSINVSIG-003: Minimum Fluorescence Skip Condition

Precondition

All test vectors in this section assume:

• dxai_cls != machine_cls (discrepancy exists)

Decision Table: Fluorescence Threshold Comparison

TV	minimum_fluorescence_to_positive	max_reading	rule_skipped	skip_reason	Covers
TV-003-001	100	99	true	Low Fluorescence	AC: max < threshold = skip
TV-003-002	100	100	false	null	AC: max == threshold = proceed
TV-003-003	100	101	false	null	AC: max > threshold = proceed
TV-003-004	100	99.99	true	Low Fluorescence	AC: Boundary - just below threshold

Automation Status

Test Vector Range	Status	Notes
TV-003-001 to TV-003-004	Automated	Data-driven parameterized tests

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Decision Table: Full Rule Evaluation Order

This table verifies the correct evaluation order of skip conditions (fluorescence first, then CT, then sigmoid).

TV	max_reading	min_fl_threshold	final_ct	max_ct_threshold	sigmoid	final_cls	rule_skipped	error_applied	skip_reason
TV-FULL-001	50	100	30	35	Upward	Positive	true	false	Low Fluorescence
TV-FULL-002	150	100	40	35	Upward	Positive	true	false	High CT
TV-FULL-003	150	100	30	35	Downward	Negative	true	false	Valid Invert Pattern
TV-FULL-004	150	100	30	35	Upward	Positive	false	true	null
TV-FULL-005	150	100	30	null	Downward	Positive	false	true	null

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Traceability to Existing Tests

Requirement	Jira Tests	Status
REQ-RULES-WDCLSINVSIG-001	BT-5221	Existing
REQ-RULES-WDCLSINVSIG-002	BT-5228, BT-5237	Existing
REQ-RULES-WDCLSINVSIG-003	BT-5369, BT-5700	Existing

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Gap Analysis

Identified Gaps

Gap	Requirement	Description	Priority	Owner
None	-	All requirements have existing Jira test tickets	-	-

Notes

• All three requirements have linked Jira test tickets
• Test vectors provide additional granularity for boundary conditions
• Full evaluation order test vectors (TV-FULL-*) verify correct skip condition sequencing