Added unit tests, documentation and function descriptions across the board. Increased cyclop complexity threshold to 15 which is a bit more sane than 10 and excluded _test.go files from linters.

internal/mock/findATender/handler.go

@@ -43,6 +43,8 @@ func encodeCursor(i int) string {
 	return base64.RawURLEncoding.EncodeToString([]byte("idx:" + strconv.Itoa(i)))
 }
 
+// decodeCursor returns the release index in a cursor made by encodeCursor.
+// Anything else, including a negative index, is an error.
 func decodeCursor(c string) (int, error) {
 	b, err := base64.RawURLEncoding.DecodeString(c)
 	if err != nil || !strings.HasPrefix(string(b), "idx:") {