Remove all unused variables and functions (#5823)

cmd/format-disk-cache_test.go

@@ -18,10 +18,20 @@ package cmd
 
 import (
 	"context"
+	"io"
 	"os"
 	"testing"
 )
 
+// Returns format.Cache.Version
+func formatCacheGetVersion(r io.ReadSeeker) (string, error) {
+	format := &formatCacheVersionDetect{}
+	if err := jsonLoad(r, format); err != nil {
+		return "", err
+	}
+	return format.Cache.Version, nil
+}
+
 // TestDiskCacheFormat - tests initFormatCache, formatMetaGetFormatBackendCache, formatCacheGetVersion.
 func TestDiskCacheFormat(t *testing.T) {
 	ctx := context.Background()