Expand code coverage across all test pipelines

[aaronburtle]

Why make this change?

Closes #3648

Why make this change?

• The rolling coverage dashboard combines results from the unit and database-specific pipelines, but significant provider-specific paths were not covered.
• This change reduces those gaps across the Unit, MsSql, PostgreSQL, MySQL, DWSQL, and CosmosDB NoSQL pipelines.

What is this change?

• Adds deterministic behavioral tests across authentication, configuration, MCP tooling, metadata providers, query builders, query executors, mutations, pagination, serialization, and error handling.
• Assigns provider-specific tests to their corresponding test categories so coverage is collected by the appropriate database pipeline.
• Exercises success, validation, authorization, parsing, fallback, and exception paths without changing production behavior.
• Validates coverage gains against source-compatible pipeline artifacts using a fixed sequence-point universe.
• Covers all reachable provider-owned coverage gaps; the remaining CosmosDB sequence points are compiler-generated or defensive unreachable paths.
• This is a test-only change with no REST, GraphQL, CLI, configuration, or runtime API changes.

How was this tested?

• Integration Tests
• Unit Tests

Sample Request(s)

N/A

[Copilot]

Pull request overview

This PR expands automated test coverage across Data API Builder’s core runtime and provider-specific paths (Unit + database-category pipelines), aligning with the goal of closing coverage gaps called out in #3648 without changing production behavior.

Changes:

• Adds new unit/integration-style tests that exercise previously uncovered branches in query structures/builders/executors, metadata providers, config converters/validators, telemetry helpers, and MCP tooling.
• Introduces provider-scoped test coverage via TestCategory for PostgreSQL/MySQL/DWSQL/CosmosDB NoSQL to ensure coverage is attributed to the correct pipeline.
• Extends existing test suites with additional edge-case/exception-path assertions (auth, parsing, pagination, error mapping, serialization).

Reviewed changes

Copilot reviewed 65 out of 65 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/Service.Tests/UnitTests/TypeHelperTests.cs	Extends type-mapping and value extraction test coverage.
src/Service.Tests/UnitTests/SqlQueryStructuresModelTests.cs	Adds equality/guard/accessor coverage for query structure model types.
src/Service.Tests/UnitTests/SqlQueryStructureHelperTests.cs	Adds coverage for SqlQueryStructure helper/private-path behavior via reflection.
src/Service.Tests/UnitTests/SqlQueryExecutorUnitTests.cs	Extends MsSqlQueryExecutor coverage for statement IDs, connection creation, and managed identity/OBO paths.
src/Service.Tests/UnitTests/SqlQueryEngineHelperTests.cs	Adds coverage for SqlQueryEngine internal execution helpers and result-shape handling.
src/Service.Tests/UnitTests/SqlPaginationUtilUnitTests.cs	Expands pagination utility coverage (cursor creation, forwarded headers, querystring formatting, JSON scalar resolution).
src/Service.Tests/UnitTests/RuntimeOptionsConverterCoverageTests.cs	Adds coverage for runtime options JSON conversion (GraphQL/REST/file sink).
src/Service.Tests/UnitTests/RuntimeConfigValidatorUnitTests.cs	Adds validator-path coverage (file sink edge cases, embeddings validation, MCP/stored-proc validation, relationship validation).
src/Service.Tests/UnitTests/RuntimeConfigHelperTests.cs	Adds coverage for RuntimeConfig defaults and mapping helper behavior.
src/Service.Tests/UnitTests/PureUtilityCoverageTests.cs	Adds focused coverage for utility helpers (log level conversion, change token, validator util, metadata type converter).
src/Service.Tests/UnitTests/PostgresQueryBuilderHelperTests.cs	Adds PostgreSQL query builder helper coverage for not-implemented/error paths.
src/Service.Tests/UnitTests/PostgreSqlQueryExecutorHelperTests.cs	Adds PostgreSQL executor helper coverage for result-set parsing error paths.
src/Service.Tests/UnitTests/PostgreSqlMetadataProviderHelperTests.cs	Adds PostgreSQL metadata provider helper coverage (search path, array UDT metadata, init errors).
src/Service.Tests/UnitTests/PostgreSqlDbExceptionParserHelperTests.cs	Adds PostgreSQL transient/status mapping coverage.
src/Service.Tests/UnitTests/MySqlQueryExecutorHelperTests.cs	Adds MySQL executor helper coverage (MI token behavior, result-set parsing error paths).
src/Service.Tests/UnitTests/MySqlQueryBuilderHelperTests.cs	Adds MySQL query builder helper coverage for not-implemented paths.
src/Service.Tests/UnitTests/MySqlMetadataProviderHelperTests.cs	Adds MySQL metadata provider helper coverage for unsupported schema and not-implemented paths.
src/Service.Tests/UnitTests/MySqlDbExceptionParserHelperTests.cs	Adds MySQL transient/status mapping coverage.
src/Service.Tests/UnitTests/MultipleCreateOrderHelperEdgeTests.cs	Adds edge-case coverage for multiple-create ordering and field/backing-column mapping.
src/Service.Tests/UnitTests/MsSqlQueryBuilderHelperTests.cs	Adds MSSQL query builder coverage for trigger/autogen PK and upsert branches.
src/Service.Tests/UnitTests/McpTelemetryTests.cs	Extends telemetry helper coverage for activity tags and error details.
src/Service.Tests/UnitTests/McpStdioServerContentBlockTests.cs	Extends MCP stdio server helper coverage for content block coercion and safe string/id parsing.
src/Service.Tests/UnitTests/McpLogNotificationTests.cs	Extends MCP logger/provider coverage (scopes, disabled behavior, formatter validation, disposal behavior).
src/Service.Tests/UnitTests/GraphQLFilterParserUnitTests.cs	Adds filter/parser helper coverage (middleware HttpContext extraction, operand chaining, IN preprocessing).
src/Service.Tests/UnitTests/ExecutionHelperScalarTests.cs	Adds coverage for scalar coercion from JSON leaf values (numeric/text/temporal, error mapping).
src/Service.Tests/UnitTests/EntitySourceConverterTests.cs	Adds coverage for legacy/modern parameter deserialization and round-trip behavior.
src/Service.Tests/UnitTests/EntityHealthOptionsConverterTests.cs	Adds coverage for entity health config conversion, defaults, and invalid inputs.
src/Service.Tests/UnitTests/EntityApiOptionsConverterCoverageTests.cs	Adds coverage for entity REST/GraphQL options conversion and edge shapes.
src/Service.Tests/UnitTests/EmbeddingTelemetryHelperTests.cs	Adds coverage for embedding metrics and trace activity tagging.
src/Service.Tests/UnitTests/EmbeddingsOptionsConverterTests.cs	Extends embeddings options converter coverage for invalid nested shapes and serialization behavior.
src/Service.Tests/UnitTests/DwSqlQueryBuilderHelperTests.cs	Adds DWSQL query builder helper coverage for join optimization and internal helpers.
src/Service.Tests/UnitTests/DmlToolsConfigConverterTests.cs	Extends DML tools config converter coverage for null/unexpected token shapes.
src/Service.Tests/UnitTests/DeserializationVariableReplacementSettingsTests.cs	Extends AKV secret name validation coverage via reflection.
src/Service.Tests/UnitTests/DatabaseObjectUnitTests.cs	Adds coverage for database object source definitions, FK/relationship equality, and role-based column resolution.
src/Service.Tests/UnitTests/CosmosSqlMetadataProviderHelperTests.cs	Adds Cosmos SQL metadata provider helper coverage (unsupported members, schema parsing, mapping, partition keys).
src/Service.Tests/UnitTests/CosmosSamplerHelperTests.cs	Adds Cosmos sampler executor coverage for success/error response processing.
src/Service.Tests/UnitTests/CosmosQueryStructureHelperTests.cs	Adds Cosmos query structure helper coverage (aliases, fragment expansion, order-by parsing).
src/Service.Tests/UnitTests/CosmosQueryEngineExecutionHelperTests.cs	Adds Cosmos query engine execution helper coverage (paging, continuation tokens, ID+PK query behavior).
src/Service.Tests/UnitTests/CosmosQueryBuilderHelperTests.cs	Adds Cosmos query builder coverage for predicate/operand resolution and EXISTS building.
src/Service.Tests/UnitTests/CosmosODataVisitorHelperTests.cs	Adds Cosmos OData visitor helper coverage for operator mapping, null handling, and parameter capture.
src/Service.Tests/UnitTests/CosmosClientProviderHelperTests.cs	Adds Cosmos client provider coverage for initialization, parsing, and AAD token credential behavior.
src/Service.Tests/UnitTests/ConfigureJwtBearerOptionsTests.cs	Adds coverage for JWT bearer option configuration across modes/providers.
src/Service.Tests/UnitTests/ConfigObjectModelCoverageTests.cs	Adds coverage for config object model default behaviors, fallbacks, and error paths.
src/Service.Tests/UnitTests/BaseSqlQueryStructureHelperTests.cs	Adds coverage for base SQL structure parsing, join predicate failures, and contextual error messaging.
src/Service.Tests/UnitTests/AutoentityConverterCoverageTests.cs	Adds coverage for autoentity converters and invalid input shapes.
src/Service.Tests/UnitTests/ApplicationNameTelemetryTests.cs	Extends decode/encode coverage for truncated/newer payloads and alphabet decoding.
src/Service.Tests/Mcp/McpServerConfigurationTests.cs	Adds coverage for MCP server option configuration.
src/Service.Tests/Mcp/McpResponseBuilderTests.cs	Extends JSON value conversion coverage (typed vs raw serialization).
src/Service.Tests/Mcp/McpMetadataHelperTests.cs	Extends metadata resolution coverage for factory exception mapping.
src/Service.Tests/Mcp/McpAuthorizationHelperTests.cs	Extends authorization helper coverage for column authorization decisions and empty-column behavior.
src/Service.Tests/Mcp/McpArgumentParserTests.cs	Extends MCP argument parsing coverage for early failures and parameter conversion.
src/Service.Tests/Mcp/DescribeEntitiesFilteringTests.cs	Extends describe-entities tool coverage for disabled/canceled/missing entity filters.
src/Service.Tests/Mcp/DeleteRecordToolUnitTests.cs	Adds coverage for delete tool behavior, authorization, key validation, and error mapping.
src/Service.Tests/Mcp/CreateRecordToolUnitTests.cs	Adds coverage for create tool behavior, authorization, result mapping, and exception handling.
src/Service.Tests/GraphQLBuilder/GraphQLUtilsTests.cs	Extends GraphQL utility coverage for scalar detection, relationship helpers, and directive helpers.
src/Service.Tests/Authorization/REST/RestAuthorizationHandlerUnitTests.cs	Extends REST authorization handler coverage for multi-requirement rejection, HTTP verb validation, and stored-proc checks.
src/Service.Tests/Authorization/AuthorizationResolverUnitTests.cs	Adds null-guard coverage for role lookup helper.

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