Add new tests to presubmit, fix errors

perf/go/shortcut/shortcut.go

Index: perf/go/shortcut/shortcut.go
diff --git a/perf/go/shortcut/shortcut.go b/perf/go/shortcut/shortcut.go
index 810f2389f33f327bec715b09e4c942234395a43b..1a5791d405446944ffe044084c49fa8e06046cd5 100644
--- a/perf/go/shortcut/shortcut.go
+++ b/perf/go/shortcut/shortcut.go
@@ -27,11 +27,11 @@ func Insert(r io.Reader) (string, error) {
 	}
 	result, err := db.DB.Exec(`INSERT INTO shortcuts (traces) VALUES (?)`, string(b))
 	if err != nil {
-		return "", fmt.Errorf("Error while inserting shortcut: err", err)
+		return "", fmt.Errorf("Error while inserting shortcut: %v", err)
 	}
 	id, err := result.LastInsertId()
 	if err != nil {
-		return "", fmt.Errorf("Error retrieving ID of new shortcut:", err)
+		return "", fmt.Errorf("Error retrieving ID of new shortcut: %v", err)
 	}
 	return fmt.Sprintf("%d", id), nil
 }