Refactor code and add txPowerReadingError value

[priyaranjannanda]

The changes include

• Refactoring the code for validation check
• Adding txPowerReadingError value for consistent validation
• Updated the constant values for inactive optical channel power

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on refactoring the transceiver power validation tests to improve code quality and consistency. By centralizing validation logic and standardizing constant values, the changes ensure more robust testing of optical channel states and power readings.

Highlights

• Code Refactoring: Consolidated power validation logic by introducing a helper function to handle nil checks and streamline validation calls.
• Constant Updates: Updated inactive optical channel power constants to 0.0 and increased the txPowerReadingError threshold to 3.
• Test Lifecycle Improvement: Refactored the interface lifecycle testing logic into a reusable function to improve readability and maintainability.

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[OpenConfigBot]

Pull Request Functional Test Report for #5428 / a30e601

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.
Cisco 8000E		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.
Cisco XRd		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.
Juniper ncPTX		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.
Nokia SR Linux		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.
Openconfig Lemming		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.
Cisco 8808		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.
Juniper PTX10008		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.
Nokia 7250 IXR-10e		TRANSCEIVER-4.1: Telemetry: 400ZR RX input and TX output power telemetry values streaming.

Help

[gemini-code-assist]

Code Review

This pull request refactors the zr_input_output_power_test.go file to improve modularity and readability by introducing helper functions for interface lifecycle management and consolidating power validation logic. Feedback from the reviewer highlights concerns regarding the increased power thresholds and error tolerances, which may be too permissive for accurate telemetry validation. Suggestions were also provided to mitigate potential test flakiness during state transitions and to enhance the clarity of error messages.

[gemini-code-assist]

Setting the inactive power thresholds to 0.0 dBm is extremely permissive. In optical networking, 0.0 dBm (1mW) is a significant amount of power and often falls within the normal operating range of an active transceiver. Typically, values like -30.0 or -40.0 are used to ensure the laser is truly off or no signal is present. Using 0.0 might fail to detect cases where a port is reported as DOWN but is still emitting or receiving significant power.

[gemini-code-assist]

Increasing txPowerReadingError to 3 dB significantly loosens the validation tolerance. A 3 dB difference represents a factor of 2 in power levels. Most ZR specifications and related tests in this repository use a much tighter tolerance, typically between 0.5 and 1.0 dB, to ensure accurate telemetry reporting.

[gemini-code-assist]

This check is likely to cause test flakiness. The samplestream starts collecting data before the interface is toggled, and gnmi.Await waits for the status to change. Consequently, the stream will contain samples from the transition period where the operStatus is still the old value. Since validateSampleStream already verifies that power levels are correct for the status reported in each sample, failing the test here for status mismatches is unnecessary and prone to error.

Suggested change

	if operStatus != expectedStatus {
	t.Errorf("Invalid %v operStatus value: want %v, got %v", p.Name(), expectedStatus, operStatus)
	}
	if operStatus != expectedStatus {
	continue
	}

[gemini-code-assist]

The error message would be more useful for debugging if it included the expected validation bounds (minAllowed, maxAllowed, or inactiveValue) that caused the failure.

Suggested change

	t.Errorf("Invalid %v sample when %v is %v --> min : %v, max : %v, avg : %v, instant : %v", pm, portName, operStatus, min, max, avg, instant)
	t.Errorf("Invalid %v sample when %v is %v --> min: %v, max: %v, avg: %v, instant: %v (expected range [%v, %v] or inactive <= %v)", pm, portName, operStatus, min, max, avg, instant, minAllowed, maxAllowed, inactiveValue)