STD: WDCLSC Invert Sigmoid Rule (WDCLSCINVSIG)

Version: v1.0.0 Status: Draft SRS Source: docusaurus/docs/srs/rules/rule-wdclsc-invert-sigmoid.md Rule Name: WDCLSC_INVERT_SIGMOID_POS Domain: RULES-WDCLSCINVSIG

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Overview

This document specifies tests for the WDCLSC Invert Sigmoid rule using decision tables and test vectors. The rule validates CLS discrepancies between DXAI and machine classifications on Control wells while considering sigmoid curve patterns, with intelligent skip conditions to reduce false-positive discrepancy errors.

Rule Characteristics:

• Pure business logic (no UI)
• Sequential skip condition evaluation (min fluorescence -> sigmoid pattern -> max CT)
• Control well specific
• Configuration-driven thresholds

Test Method: TM-API (per Test Plan §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. The rule has three sequential skip conditions, each with distinct triggering logic. Test vectors cover all condition combinations including boundary cases and error handling.

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Coverage Summary

REQ ID	Title	Conditions	Test Vectors	Coverage	Gaps
REQ-RULES-WDCLSCINVSIG-001	Sigmoid Pattern Skip	6	8	100%	None
REQ-RULES-WDCLSCINVSIG-002	Maximum CT Skip	5	7	100%	None
REQ-RULES-WDCLSCINVSIG-003	Minimum Fluorescence Skip	4	6	100%	None

Totals: 3 REQs, 15 Conditions, 21 Test Vectors, 100% Coverage

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Input Variables

Variable	Type	Valid Values	Description
obs.readings	array	float[], empty	Fluorescence readings over amplification cycles
obs.max_reading	float	numeric	Maximum value from readings array
obs.sigmoid_pattern	string	downward, upward, undetermined	Detected sigmoid curve pattern
obs.final_cls	string	positive, negative	Final classification result
obs.final_ct	float	numeric, null	Final cycle threshold value
config.minimum_fluorescence_to_positive	float	numeric, missing	Min fluorescence threshold for rule execution
config.max_ct_for_cls_discrepancy	float?	numeric, null	Max CT above which discrepancy is skipped

Output Variables

Variable	Type	Description
rule_skipped	bool	Rule did not execute (min fluorescence not met)
discrepancy_error_assigned	bool	CLS discrepancy error was assigned to observation

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REQ-RULES-WDCLSCINVSIG-003: Minimum Fluorescence Skip

This requirement is evaluated FIRST in execution order. When the maximum reading is below the threshold, the entire rule is skipped.

Decision Table: Threshold Comparison

TV	max_reading	min_fluor_config	rule_skipped	Covers
TV-003-001	99	100	true	AC: Below threshold - skip rule
TV-003-002	100	100	false	AC: At threshold - execute rule (boundary)
TV-003-003	101	100	false	AC: Above threshold - execute rule

Decision Table: Error Handling

TV	readings	min_fluor_config	rule_skipped	Covers
TV-003-004	[] (empty)	100	true	AC: Empty readings - skip rule
TV-003-005	[50, 75, 100]	missing	false	AC: Missing config - proceed with rule
TV-003-006	[50, 75, 100]	100	false	AC: Normal case - max=100, threshold=100

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REQ-RULES-WDCLSCINVSIG-001: Sigmoid Pattern Skip

This requirement is evaluated SECOND. When sigmoid pattern is downward AND final classification is negative, the discrepancy error is skipped.

Decision Table: Sigmoid + Classification Matrix

TV	sigmoid_pattern	final_cls	discrepancy_error_assigned	Covers
TV-001-001	downward	negative	false	AC: Skip - both conditions met
TV-001-002	downward	positive	true	AC: Error - wrong classification
TV-001-003	upward	negative	true	AC: Error - wrong pattern
TV-001-004	upward	positive	true	AC: Error - neither skip condition

Decision Table: Undetermined Pattern

TV	sigmoid_pattern	final_cls	discrepancy_error_assigned	Covers
TV-001-005	undetermined	negative	true	AC: Undetermined = no skip
TV-001-006	undetermined	positive	true	AC: Undetermined = no skip

Decision Table: Error Handling

TV	readings	sigmoid_pattern	discrepancy_error_assigned	Covers
TV-001-007	missing	N/A	(proceeds to CT check)	AC: Missing readings - skip sigmoid eval
TV-001-008	[] (empty)	N/A	(proceeds to CT check)	AC: Empty readings - skip sigmoid eval

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REQ-RULES-WDCLSCINVSIG-002: Maximum CT Skip

This requirement is evaluated THIRD (after sigmoid check fails to skip). When final CT >= max threshold, the discrepancy error is skipped.

Decision Table: CT Threshold Comparison

TV	max_ct_config	final_ct	discrepancy_error_assigned	Covers
TV-002-001	35	36	false	AC: CT > threshold - skip error
TV-002-002	36	36	false	AC: CT = threshold - skip error (boundary)
TV-002-003	37	36	true	AC: CT < threshold - assign error

Decision Table: Null Configuration

TV	max_ct_config	final_ct	discrepancy_error_assigned	Covers
TV-002-004	null	36	true	AC: Null config - no skip, assign error
TV-002-005	null	100	true	AC: Null config - any CT assigns error

Decision Table: Error Handling

TV	max_ct_config	final_ct	discrepancy_error_assigned	Covers
TV-002-006	35	invalid	true	AC: Invalid CT - log warning, assign error
TV-002-007	missing	36	true	AC: Missing config - default behavior, assign error

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Combined Execution Order Test

This section verifies the sequential evaluation order: REQ-003 -> REQ-001 -> REQ-002.

Decision Table: Full Execution Flow

TV	max_reading	min_fluor	sigmoid	final_cls	max_ct_cfg	final_ct	rule_skipped	error_assigned	Covers
TV-FLOW-001	50	100	N/A	N/A	N/A	N/A	true	false	REQ-003: Rule skipped at fluorescence check
TV-FLOW-002	100	100	downward	negative	35	30	false	false	REQ-001: Skipped at sigmoid check
TV-FLOW-003	100	100	upward	negative	35	36	false	false	REQ-002: Skipped at CT check
TV-FLOW-004	100	100	upward	negative	37	36	false	true	All checks pass - error assigned
TV-FLOW-005	100	100	upward	positive	null	36	false	true	All checks pass - error assigned

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Traceability to Existing Tests

Requirement	Jira Tests	Automation Status
REQ-RULES-WDCLSCINVSIG-001	BT-5220	Automated
REQ-RULES-WDCLSCINVSIG-002	BT-5237	Automated
REQ-RULES-WDCLSCINVSIG-003	Pending	Gap

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Gap Analysis

Identified Gaps

Gap	Requirement	Description	Priority	Owner
GAP-001	REQ-RULES-WDCLSCINVSIG-003	No Jira test ticket for minimum fluorescence skip	High	TBD

Remediation Plan

1. GAP-001: Create test ticket covering TV-003-001 through TV-003-006 for minimum fluorescence threshold validation