test and fix parsehashkey

src/adapt.go

@@ -141,6 +141,7 @@ func parseHashKey(raw []byte) string {
 				}
 				return string(matches[j][1])
 			}
+			return string(matches[i][1])
 		}
 	}
 	return ""

src/adapt_test.go

@@ -3,10 +3,31 @@ package src
 import (
 	"bufio"
 	"bytes"
+	"fmt"
 	"strings"
 	"testing"
 )
 
+func TestParseHashKey(t *testing.T) {
+	cases := map[string]string{
+		"+OK\r\n":                        "+OK",
+		"+string\r\n":                    "+string",
+		"*1\r\n$4\r\nping\r\n":           "ping",
+		"*2\r\n$3\r\nget\r\n$1\r\nx\r\n": "x",
+		"*2\r\n$3\r\nset\r\n$1\r\nx\r\n$1\r\ny\r\n": "x",
+	}
+
+	for given, expect := range cases {
+		given, expect := given, expect
+		t.Run(fmt.Sprintf("%q", given), func(t *testing.T) {
+			got := parseHashKey([]byte(given))
+			if string(got) != expect {
+				t.Errorf("expected %q=>%q but got =>%q", given, expect, got)
+			}
+		})
+	}
+}
+
 func TestReadMessage(t *testing.T) {
 	cases := map[string]string{
 		"ok":              "+OK\r\n",