One tool to generate all test cases

[alexgarzao]

This PR introduces a new automated test generation tool called TestGen and refactors the code generator validation logic to improve maintainability and consistency. The main changes are the addition of the TestGen tool and templates for generating unit tests, the standardization of the GenValidations type across the codebase, and updates to the build process to support automated test generation.

With these generated tests, some duplicated tests will be removed in another PR.

Test Generation Automation

• Added the testgen tool, including a comprehensive README (testgen/README.md) describing its purpose, the types of tests it generates, and usage instructions. TestGen automates the creation of unit, end-to-end, and benchmark tests for all validation/type combinations, reducing manual effort and errors.
• Implemented new templates and generator scripts for producing unit tests of the BuildValidationCode function, including testgen/build_validation_code_test.tpl, testgen/generate_validation_code_tests.go, and updates to testgen/generate_tests.go. These generate exhaustive tests for all supported types and validations, both with and without pointers. [1] [2] [3]

Codebase Refactoring and Standardization

• Refactored the code generator validation logic by renaming the type genValidations to GenValidations and updating all references and method receivers accordingly in internal/codegenerator/codegen.go, internal/codegenerator/build_validator.go, and related test files. This standardizes the naming and improves code clarity. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]

Build and Workflow Improvements

• Updated the Makefile to add new targets for running TestGen (testgen), setup, and linting, and revised the test generation step to use the new tool and workflow. This enables easy regeneration of tests and integration into CI/CD pipelines. [1] [2]

Minor Cleanups

• Removed commented-out code and performed minor cleanups in test files to improve readability and maintainability.

These changes collectively make the codebase more robust and easier to maintain by automating test generation, standardizing validation logic, and improving the build workflow.

[Copilot]

Pull Request Overview

This PR introduces TestGen, an automated test generation tool that consolidates and standardizes test creation across ValidGen's codebase. The tool generates unit tests, end-to-end tests, and benchmark tests for all validation/type combinations, reducing manual effort and improving maintainability. A key refactoring accompanies this change: renaming genValidations to GenValidations for export consistency, enabling TestGen to leverage internal code generation logic.

Key Changes:

• Added TestGen tool with comprehensive test generation capabilities for all validation/type combinations
• Exported genValidations as GenValidations to enable cross-package usage by TestGen
• Updated build process to integrate automated test generation via new make testgen target

Reviewed Changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
testgen/README.md	Documentation explaining TestGen's purpose, architecture, and usage
testgen/generate_tests.go	Main entry point orchestrating test generation workflows
testgen/validations.go	Central configuration defining all validation rules, types, and test cases
testgen/generate_validation_types_tests.go	Generator for end-to-end validation type tests
testgen/generate_validation_code_tests.go	Generator for unit tests of BuildValidationCode function
testgen/*.tpl	Templates for generating test files with different configurations
internal/codegenerator/codegen.go	Renamed genValidations to GenValidations for export
internal/codegenerator/build_validator.go	Updated method receivers and references to GenValidations
internal/codegenerator/*_test.go	Updated test files to use GenValidations type
Makefile	Added testgen target and updated test generation workflow
tests/endtoend/generated_*.go	Updated header comments to reference TestGen

[Copilot]

Functions generateValidationTypesTests() and generateValidationCodeTests() are called but not defined in this file. These should be generateValidationTypesEndToEndTests() and generateValidationCodeUnitTests() respectively, based on the actual function names in the other files.

Suggested change

	generateValidationTypesTests()
	generateValidationCodeTests()
	generateValidationTypesEndToEndTests()
	generateValidationCodeUnitTests()