ENV-004d — Control Time Sources

Go to ENV-004 — Provide Deterministic Test Environment

For each Test Execution, the DIDO-TE SHALL control or measure and record each time source identified by the applicable Test Definition.

• ENV-004 — Provide Deterministic Test Environment
• [DTE5] DIDO-TE Requirements Register, source requirement identifier and obligation to be assigned
• [DTE6] Structured Information Processing Reference Architecture (SIP-RA)
• [DTE7] Federated Data Interpretation Systems Reference Architecture (FDIS-RA)

Time affects event ordering, scheduling, timeout behaviour, expiration, retries, message processing, transaction processing, security controls, and the interpretation of Test Results.

A distributed Test Environment may contain multiple physical, virtual, simulated, monotonic, or externally supplied time sources. Differences among these sources include offset, drift, precision, resolution, synchronisation status, adjustment behaviour, and leap-second handling.

Where the Test Definition requires a fixed, simulated, or otherwise controlled time source, the DIDO-TE supplies and maintains that source. Where controlling a time source would distort the behaviour under test, the DIDO-TE measures and records its characteristics and variation.

Explicit control or observation of time sources permits investigators to distinguish time-related environmental variation from the behaviour of the Test Object.

• Test Environment
• Test Definition
• Test Execution
• Test Object
• Node
• Test Resource
• Configuration
• Constraint
• Evidence

Verification confirms that:

• The applicable Test Definition identifies each time source capable of influencing the Test Execution or Test Results.
• The controlled descriptive information specifies whether the DIDO-TE controls or measures and records each identified time source.
• Each identified time source has a unique identity and specified provider.
• Each identified time source specifies its clock type, reference, time zone, offset, precision, resolution, synchronisation method, drift tolerance, and adjustment behaviour, where applicable.
• The DIDO-TE supplies each controlled time source with the specified characteristics.
• The DIDO-TE measures each uncontrolled time source and records its applicable characteristics and variation.
• The DIDO-TE detects loss of synchronisation, excessive offset, excessive drift, unexpected adjustment, unavailable time, and substitution of an unauthorised time source.
• The DIDO-TE records time-source identity, configuration, synchronisation status, offset, drift, adjustments, detected deviations, and relevant timestamps as Evidence.
• Timestamps used for correlation identify their applicable time source and provide sufficient precision and resolution for the Test Definition.
• The DIDO-TE maintains Traceability among each time source, its controlled descriptive information, affected Test Environment elements, Test Definition, Test Execution, and Test Results.
• An unidentified, unavailable, unsynchronised, incorrectly configured, insufficiently precise, unmeasured, unrecorded, or untraceable time source constitutes nonconformance with this requirement when it falls outside the conditions permitted by the Test Definition.

Verification includes:

• Inspection of the time sources identified by the Test Definition
• Inspection of time-source identities, providers, types, references, time zones, offsets, precision, resolution, synchronisation methods, drift tolerances, and adjustment behaviour
• Observation of controlled time-source provisioning
• Observation of time-source measurement and recording
• Comparison of timestamps produced by participating Nodes and Test Resources
• Testing with loss of synchronisation, excessive offset, excessive drift, unexpected adjustment, unavailable time, or an unauthorised time source
• Confirmation that the DIDO-TE detects and records each applicable deviation
• Inspection of time-source status, measurement, adjustment, deviation, and timestamp Evidence
• Inspection of Traceability records connecting each time source to its controlled descriptive information, affected elements, Test Definition, Test Execution, and Test Results
• Confirmation that a time-source condition outside its permitted tolerance produces a nonconformance result

• Add links to the architecture sections governing time-source control, clock synchronisation, timestamping, event correlation, environmental monitoring, Evidence, and Traceability.

Assign the applicable delivery phase.

Draft

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