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: resource_redis_instance_internal_test.go
    path of file: ./repos/magic-modules/mmv1/third_party/terraform/services/redis
    
    the code of the file until where you have to start completion: package redis

import (
	"testing"
)

func TestSecondaryIpDiffSuppress(t *testing.T) {
	cases := map[string]struct {
		Old, New           string
		ExpectDiffSuppress bool
	}{
		"empty strings": {
			Old:                "",
			New:                "",
			ExpectDiffSuppress: true,
		},
		"auto range": {
			Old:                "",
			New:                "auto",
			Expect
    
func TestUnitRedisInstance_redisVersionIsDecreasing(t *testing.T) {
	t.Parallel()
	type testcase struct {
		name       string
		old        interface{}
		new        interface{}
		decreasing bool
	}
	tcs := []testcase{
		{
			name:       "stays the same",
			old:        "REDIS_4_0",
			new:        "REDIS_4_0",
			decreasing: false,
		},
		{
			name:       "increases",
			old:        "REDIS_4_0",
			new:        "REDIS_5_0",
			decreasing: false,
		},
		{
			name:       "nil vals",
			old:        nil,
			new:        "REDIS_4_0",
			decreasing: false,
		},
		{
			name:       "corrupted",
			old:        "REDIS_4_0",
			new:        "REDIS_banana",
			decreasing: false,
		},
		{
			name:       "decreases",
			old:        "REDIS_6_0",
			new:        "REDIS_4_0",
			decreasing: true,
		},
	}

	for _, tc := range tcs {
		decreasing := isRedisVersionDecreasingFunc(tc.old, tc.new)
		if decreasing != tc.decreasing {
			t.Errorf("%s: expected decreasing to be %v, but was %v", tc.name, tc.decreasing, decreasing)
		}
	}
}