Add experiment properties to feature flag exposure tracking

[efahk]

Plumbs ExperimentID, isExperimentActive, and isQATester, optional properties that may be present in the /flags API response, through to the tracked $experiment_started event.

GitHub Copilot Summary

This pull request adds support for optional experiment tracking parameters to feature flag variants in the Mixpanel Android SDK. The changes ensure that experiment-related fields (experiment_id, is_experiment_active, and is_qa_tester) are parsed from API responses, stored in the MixpanelFlagVariant class, and included in tracking event properties. A new test verifies that these fields are correctly handled end-to-end.

Feature flag experiment tracking enhancements:

• Added new fields (experimentID, isExperimentActive, isQATester) to the MixpanelFlagVariant class, updated constructors to initialize them, and documented their purpose. [1] [2] [3] [4] [5]
• Updated the constants in MPConstants.Flags for the new experiment tracking fields.

Parsing and serialization improvements:

• Modified JsonUtils.parseFlagsResponse to extract the new experiment tracking fields from the API response and pass them to the MixpanelFlagVariant constructor.
• Updated the test helper method createFlagsResponseJson to include the optional experiment parameters when present.

Tracking event property updates:

• Enhanced _performTrackingDelegateCall in FeatureFlagManager to include the new experiment parameters in tracking event properties if available.

Testing:

• Added a new test to FeatureFlagManagerTest to verify that all optional experiment parameters are included in tracking event properties when present.

[efahk]

looks like some test flakes maybe, everything's passing locally

[Copilot]

Pull Request Overview

This PR adds support for three new optional experiment tracking fields (experiment_id, is_experiment_active, is_qa_tester) from the Mixpanel flags API response to be included in the $experiment_started event tracking.

Key changes:

• Extends the MixpanelFlagVariant class with three new optional experiment tracking fields
• Updates flag parsing logic to extract these optional fields from API responses
• Modifies experiment tracking to include these fields when present

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
MPConstants.java	Adds string constants for the three new experiment tracking field keys
JsonUtils.java	Updates flag parsing to extract optional experiment fields from JSON response
MixpanelFlagVariant.java	Adds new fields and constructor overloads to support experiment tracking data
FeatureFlagManager.java	Updates tracking logic to include experiment fields in event properties
FeatureFlagManagerTest.java	Adds test coverage for the new experiment tracking functionality

[jaredmixpanel]

LGTM