feat(test): Expand unit test coverage across core packages using Ginkgo + Gomega

[tarone-saloni]

While adding unit tests, I was thinking about using Ginkgo and Gomega for writing tests.

They provide a more structured BDD-style approach (Describe, Context, It) which can make tests easier to read and maintain as the test suite grows. Gomega also provides cleaner and more expressive assertions compared to manual checks with the standard testing package.

Example:

Standard Go test

if result != expected {
    t.Errorf("expected %v got %v", expected, result)
}

With Gomega

Expect(result).To(Equal(expected))

Docs:

• Ginkgo: https://onsi.github.io/ginkgo/
• Gomega: https://onsi.github.io/gomega/

[tarone-saloni]

/cc @nderjung