dashboard/app: fix bad use of context values

Linter warns:

dashboard/app/util_test.go:680:47: SA1029: should not use built-in type string
	as key for value; define your own type to avoid collisions
	newContext := context.WithValue(r.Context(), requestIDKey, requestNum)
	                                             ^

1 files changed, 3 insertions, 3 deletions

diff --git a/dashboard/app/util_test.go b/dashboard/app/util_test.go
index 66663cb3c..ff74187a9 100644
--- a/dashboard/app/util_test.go
+++ b/dashboard/app/util_test.go
@@ -677,7 +677,7 @@ func registerRequest(r *http.Request, c *Ctx) *http.Request {
 	defer requestMu.Unlock()
 
 	requestNum++
-	newContext := context.WithValue(r.Context(), requestIDKey, requestNum)
+	newContext := context.WithValue(r.Context(), requestIDKey{}, requestNum)
 	newRequest := r.WithContext(newContext)
 	requestContexts = append(requestContexts, RequestMapping{requestNum, c})
 	return newRequest
@@ -709,10 +709,10 @@ func unregisterContext(c *Ctx) {
 	requestContexts = requestContexts[:n]
 }
 
-const requestIDKey = "test_request_id"
+type requestIDKey struct{}
 
 func getRequestID(c context.Context) int {
-	val, ok := c.Value(requestIDKey).(int)
+	val, ok := c.Value(requestIDKey{}).(int)
 	if !ok {
 		panic("the context did not come from a test")
 	}