Have you worked with the testify library for writing tests?

Yes, I have worked with the testify library in Go for writing tests. Testify provides convenient functions for assertions and mocks, which simplifies testing.

For example, with testify/assert, you can write tests like:

import "github.com/stretchr/testify/assert"

func TestSum(t *testing.T) {
    result := Sum(2, 3)
    assert.Equal(t, 5, result, "Expected sum to be 5")
}

Also, testify/mock allows creating mocks for interfaces, which is useful when testing components with external dependencies.