v2 for real

[mdwhatcott]

Once thought to be merely a mythical creature, gunit/v2 is here, more real than ever.

• The runner is easier to grok, and handles integration tests (shared fixtures).
• The assertions return an actual error value in failure conditions.

NOTE: The v2 module has been defined in its very own /v2 subdirectory so that the v1 code can remain here with continuing support. There's no need to port v1 test fixtures to v2 (nor am I recommending that) but new projects should use v2 from the start.

[Copilot]

Pull request overview

This PR introduces gunit/v2, a major revision of the testing framework with improved design and error handling. The v2 implementation is isolated in a /v2 subdirectory to maintain backward compatibility with v1 code, allowing existing projects to continue using v1 while new projects can adopt v2 from the start.

Key changes:

• Enhanced test runner that supports both unit tests (parallel execution with fresh fixtures) and integration tests (shared fixtures)
• Assertions now return actual error values instead of just failing tests, enabling better error handling patterns
• Comprehensive assertion library with clear error reporting and stack traces

Reviewed changes

Copilot reviewed 94 out of 94 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
v2/go.mod	Defines the v2 module requiring Go 1.25
v2/gunit.go	Core test runner with fixture lifecycle management
v2/options.go	Configuration options for test execution modes
v2/fixture.go	Base fixture type with assertion helpers
v2/assert/should/*.go	Assertion library with various comparison functions
v2/examples/bowling_game*.go	Example bowling game implementation and tests
v2/assert/should/internal/	Third-party libraries for diff/render functionality

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