## Why make this change? Related to: #3648 Closes #3717 ## What is this change? Improves branch coverage by adding fast, database-free unit tests for pure-logic classes that were previously at 0% or very low coverage. No product/runtime behavior is changed. Adds ~300 unit test methods (500+ cases including `[DataRow]` variations) across 35 files, all running in the existing unit-test job - **Config JSON converters & model:** `EmbeddingsOptions`, `DmlToolsConfig`, `AKVRetryPolicy`, `AzureKeyVault`, `Compression`, `Bool`, `RuntimeCache`/`Level2` converters; `EmbeddingsEndpointOptions` role resolution; `DeserializationVariableReplacementSettings` (env + local `@akv` file resolution). - **MCP tooling:** non-DB validation paths for the built-in `create/read/update/delete_record` tools (tool-disabled, invalid args, metadata failures); `McpArgumentParser`, `McpJsonHelper`, `McpResponseBuilder`, `McpErrorHelpers`, `McpAuthorizationHelper`, `McpMetadataHelper`, and `McpTelemetryHelper`. - **Core helpers/parsers/extensions:** `TypeHelper`, `EnumExtensions`, `Utf8JsonReaderExtensions`, `HttpStatusCodeExtensions`, `ProductInfo`, and `MergeJsonProvider`. - **GraphQL builder:** `GraphQLNaming`, `GraphQLUtils`, `GraphQLStoredProcedureBuilderHelpers`, `SchemaConverter` type mapping, and `EdmModelBuilder`. - **REST / OpenAPI & request validation:** `OpenApiDocumentor`, and `RequestValidator` (static + instance) paths. - **Runtime config validation:** `RuntimeConfigValidator` and `RuntimeConfigProvider` logic. - **SQL pure-logic helpers:** `SqlPaginationUtil` and `SqlResponseHelpers` (mutation) paths. ## How was this tested? After we have the aggregation of code coverage PR, we will get better numbers on how our changes to the code coverage in each pipeline is affecting the total code coverage. However, in the meantime we can see the impact on each pipeline to see the coverage increase. Before our changes: <img width="767" height="232" alt="image" src="https://github.com/user-attachments/assets/9fc331b5-bf0b-447e-af02-6d13d8dce109" /> After our changes: <img width="768" height="240" alt="image" src="https://github.com/user-attachments/assets/6e8a59f3-8ebd-4a9b-bc09-d608cda0d15e" /> - [ ] Integration Tests - [x] Unit Tests ## Sample Request(s) N/A --------- Co-authored-by: Aniruddh Munde <anmunde@microsoft.com>

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[Fundamentals] Code coverage #3648

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