You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: strings_test.go
    path of file: ./repos/grafana/pkg/util
    
    the code of the file until where you have to start completion: package util

import (
	"testing"
	"time"

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

func TestStringsFallback2(t *testing.T) {
	tests := []struct {
		val1     string
		val2     string
		expected string
	}{
		// testing every scenario
	
    
func TestDateAge(t *testing.T) {
	assert.Equal(t, "?", GetAgeString(time.Time{})) // base case

	tests := map[time.Duration]string{
		-1 * time.Hour:       "< 1 minute", // one hour in the future
		0:                    "< 1 minute",
		2 * time.Second:      "< 1 minute",
		2 * time.Minute:      "2 minutes",
		2 * time.Hour:        "2 hours",
		3 * 24 * time.Hour:   "3 days",
		67 * 24 * time.Hour:  "2 months",
		409 * 24 * time.Hour: "1 year",
	}
	for elapsed, expected := range tests {
		assert.Equalf(
			t,
			expected,
			GetAgeString(time.Now().Add(-elapsed)),
			"duration '%s'",
			elapsed.String(),
		)
	}
}