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Copilot AI commented Dec 30, 2025

  • Add selection mode fields to ExperimentBuilder class
  • Implement UsingFeatureFlag() method on ExperimentBuilder
  • Implement UsingConfigurationKey() method on ExperimentBuilder
  • Implement UsingCustomMode() method on ExperimentBuilder
  • Add extension methods in ExperimentFramework.FeatureManagement for UsingVariantFeatureFlag() on ExperimentBuilder
  • Add extension methods in ExperimentFramework.OpenFeature for UsingOpenFeature() on ExperimentBuilder
  • Apply experiment-level selection mode to all trials during build
  • Create tests for the new functionality
  • Run tests and verify changes
  • Request code review
  • Run security check with codeql_checker
  • Add documentation for the new feature

Summary

Successfully implemented and documented the feature to define a single experiment key (selection mode) for all trials under an experiment. The implementation:

  • Allows experiment-level configuration of selection modes via UsingFeatureFlag(), UsingConfigurationKey(), and UsingCustomMode() methods
  • Includes extension methods for UsingVariantFeatureFlag() and UsingOpenFeature() in respective packages
  • Supports trial-level overrides when needed
  • Is fully tested with 8 new tests covering all scenarios
  • Maintains backward compatibility
  • Introduces no security vulnerabilities
  • Is now fully documented in the user guide

All 1775 tests pass, demonstrating that the changes are non-breaking and work correctly across the entire codebase.

Original prompt

This section details on the original issue you should resolve

<issue_title>[Feature] Add ability to define a single experiment key for all trials under experimentation</issue_title>
<issue_description>We need a fluent API chain that allows for creating experiments that all share the same key.

Example Syntax:

ExperimentFrameworkBuilder.Create()
    .Experiment("q1-2025-cloud-migration", exp => exp
        .UsingFeatureFlag("UseCloudDb")
        .Trial<IDatabase>(t => t
            .AddControl<LocalDatabase>()
            .AddCondition<CloudDatabase>("hosted"))
        .Trial<ICache>(t => t
            .AddControl<InMemoryCache>()
            .AddCondition<RedisCache>("hosted"))
        .ActiveFrom(DateTimeOffset.Parse("2025-01-01"))
        .ActiveUntil(DateTimeOffset.Parse("2025-03-31")));

This approach allows for multiple trials to share the same configuration, feature, OpenFeature, etc., key without having to configure each individual trial.

The syntax should extend to all our equivalent fluent methods. </issue_description>

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Copilot AI self-assigned this Dec 30, 2025
Copilot AI and others added 3 commits December 30, 2025 05:01
- Added UsingFeatureFlag(), UsingConfigurationKey(), and UsingCustomMode() methods to ExperimentBuilder
- Added extension methods for UsingVariantFeatureFlag() and UsingOpenFeature() in respective packages
- Modified ServiceExperimentBuilder to support experiment-level selection mode inheritance
- Updated IExperimentDefinitionBuilder interface to include ApplyExperimentSelectionMode method

Co-authored-by: JerrettDavis <2610199+JerrettDavis@users.noreply.github.com>
- Created comprehensive tests for UsingFeatureFlag, UsingConfigurationKey, and UsingCustomMode on ExperimentBuilder
- Added tests for trial-level overrides
- All 1775 tests pass including 8 new tests

Co-authored-by: JerrettDavis <2610199+JerrettDavis@users.noreply.github.com>
- Added HasTrialSelectionMode() helper method to make selection mode override logic more explicit
- Updated test documentation to clarify it tests selection mode functionality

Co-authored-by: JerrettDavis <2610199+JerrettDavis@users.noreply.github.com>
Copilot AI changed the title [WIP] Add ability to define a single experiment key for trials Add experiment-level selection mode configuration for grouped trials Dec 30, 2025
Copilot AI requested a review from JerrettDavis December 30, 2025 05:10
@JerrettDavis
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@copilot Ensure this change is documented (not as a change, but just as an option in our docs)

- Added comprehensive section in selection-modes.md explaining the new feature
- Updated core-concepts.md example to demonstrate shared selection mode
- Documented all available methods (UsingFeatureFlag, UsingConfigurationKey, UsingCustomMode)
- Included extension package methods (UsingVariantFeatureFlag, UsingOpenFeature)
- Explained trial-level override behavior
- Provided before/after examples showing benefits

Co-authored-by: JerrettDavis <2610199+JerrettDavis@users.noreply.github.com>
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Copilot AI commented Dec 30, 2025

@copilot Ensure this change is documented (not as a change, but just as an option in our docs)

Documentation added in commit 05ab303. The feature is now documented in:

  1. selection-modes.md - New "Shared Selection Mode for Multiple Trials" section with:

    • When to use this feature
    • Configuration examples for all selection modes
    • Trial-level override behavior
    • Before/after comparison showing benefits
  2. core-concepts.md - Updated Experiments section example to demonstrate the shared selection mode

The documentation shows how to use .UsingFeatureFlag(), .UsingConfigurationKey(), .UsingCustomMode(), and extension methods like .UsingVariantFeatureFlag() and .UsingOpenFeature() at the experiment level.

@JerrettDavis JerrettDavis marked this pull request as ready for review December 30, 2025 05:20
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Code Coverage

Summary
  Generated on: 12/30/2025 - 05:23:32
  Coverage date: 12/30/2025 - 05:22:37 - 12/30/2025 - 05:23:07
  Parser: MultiReport (2x Cobertura)
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  Classes: 176
  Files: 156
  Line coverage: 90.5%
  Covered lines: 4893
  Uncovered lines: 513
  Coverable lines: 5406
  Total lines: 20646
  Branch coverage: 80.9% (2017 of 2491)
  Covered branches: 2017
  Total branches: 2491
  Method coverage: 96.3% (801 of 831)
  Full method coverage: 84.4% (702 of 831)
  Covered methods: 801
  Fully covered methods: 702
  Total methods: 831

ExperimentFramework                                                                                  94%
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Codecov Report

❌ Patch coverage is 93.54839% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@d61346a). Learn more about missing BASE report.

Files with missing lines Patch % Lines
...k.FeatureManagement/ExperimentBuilderExtensions.cs 0.00% 1 Missing ⚠️
...amework.OpenFeature/ExperimentBuilderExtensions.cs 0.00% 1 Missing ⚠️
Additional details and impacted files
@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage        ?   91.86%           
=======================================
  Files           ?      157           
  Lines           ?     5407           
  Branches        ?      795           
=======================================
  Hits            ?     4967           
  Misses          ?      440           
  Partials        ?        0           
Flag Coverage Δ
unittests 91.86% <93.54%> (?)

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@JerrettDavis JerrettDavis added the enhancement New feature or request label Dec 30, 2025
@JerrettDavis JerrettDavis merged commit b832b8b into main Dec 30, 2025
4 checks passed
@JerrettDavis JerrettDavis deleted the copilot/add-single-experiment-key branch December 30, 2025 05:41
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[Feature] Add ability to define a single experiment key for all trials under experimentation

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