RemoteCache: redis connection string parsing test (#17702)

pkg/infra/remotecache/redis_storage_test.go

+package remotecache
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	redis "gopkg.in/redis.v2"
+)
+
+func Test_parseRedisConnStr(t *testing.T) {
+	cases := map[string]struct {
+		InputConnStr  string
+		OutputOptions *redis.Options
+		ShouldErr     bool
+	}{
+		"all redis options should parse": {
+			"addr=127.0.0.1:6379,pool_size=100,db=1,password=grafanaRocks",
+			&redis.Options{
+				Addr:     "127.0.0.1:6379",
+				PoolSize: 100,
+				DB:       1,
+				Password: "grafanaRocks",
+				Network:  "tcp",
+			},
+			false,
+		},
+		"subset of redis options should parse": {
+			"addr=127.0.0.1:6379,pool_size=100",
+			&redis.Options{
+				Addr:     "127.0.0.1:6379",
+				PoolSize: 100,
+				Network:  "tcp",
+			},
+			false,
+		},
+		"trailing comma should err": {
+			"addr=127.0.0.1:6379,pool_size=100,",
+			nil,
+			true,
+		},
+		"invalid key should err": {
+			"addr=127.0.0.1:6379,puddle_size=100",
+			nil,
+			true,
+		},
+		"empty connection string should err": {
+			"",
+			nil,
+			true,
+		},
+	}
+
+	for reason, testCase := range cases {
+		options, err := parseRedisConnStr(testCase.InputConnStr)
+		if testCase.ShouldErr {
+			assert.Error(t, err, fmt.Sprintf("error cases should return non-nil error for test case %v", reason))
+			assert.Nil(t, options, fmt.Sprintf("error cases should return nil for redis options for test case %v", reason))
+			continue
+		}
+		assert.NoError(t, err, reason)
+		assert.EqualValues(t, testCase.OutputOptions, options, reason)
+
+	}
+}