[tests] [qt] Introduce qt/test/util with a generalized ConfirmMessage

ConfirmMessage is reused in future tests apart from its single usage here.

src/Makefile.qttest.include

@@ -20,6 +20,7 @@ TEST_QT_H = \
   qt/test/compattests.h \
   qt/test/rpcnestedtests.h \
   qt/test/uritests.h \
+  qt/test/util.h \
   qt/test/paymentrequestdata.h \
   qt/test/paymentservertests.h \
   qt/test/wallettests.h
@@ -38,6 +39,7 @@ qt_test_test_bitcoin_qt_SOURCES = \
   qt/test/rpcnestedtests.cpp \
   qt/test/test_main.cpp \
   qt/test/uritests.cpp \
+  qt/test/util.cpp \
   $(TEST_QT_H) \
   $(TEST_BITCOIN_CPP) \
   $(TEST_BITCOIN_H)

src/qt/test/util.cpp

@@ -0,0 +1,22 @@
+#include <qt/callback.h>
+
+#include <QApplication>
+#include <QMessageBox>
+#include <QTimer>
+#include <QString>
+#include <QPushButton>
+#include <QWidget>
+
+void ConfirmMessage(QString* text, int msec)
+{
+    QTimer::singleShot(msec, makeCallback([text](Callback* callback) {
+        for (QWidget* widget : QApplication::topLevelWidgets()) {
+            if (widget->inherits("QMessageBox")) {
+                QMessageBox* messageBox = qobject_cast<QMessageBox*>(widget);
+                if (text) *text = messageBox->text();
+                messageBox->defaultButton()->click();
+            }
+        }
+        delete callback;
+    }), SLOT(call()));
+}

src/qt/test/util.h

@@ -0,0 +1,12 @@
+#ifndef BITCOIN_QT_TEST_UTIL_H
+#define BITCOIN_QT_TEST_UTIL_H
+
+/**
+ * Press "Ok" button in message box dialog.
+ *
+ * @param text - Optionally store dialog text.
+ * @param msec - Number of miliseconds to pause before triggering the callback.
+ */
+void ConfirmMessage(QString* text = nullptr, int msec = 0);
+
+#endif // BITCOIN_QT_TEST_UTIL_H

src/qt/test/wallettests.cpp

@@ -1,4 +1,5 @@
 #include <qt/test/wallettests.h>
+#include <qt/test/util.h>
 
 #include <interfaces/node.h>
 #include <qt/bitcoinamountfield.h>
@@ -35,21 +36,6 @@
 
 namespace
 {
-//! Press "Ok" button in message box dialog.
-void ConfirmMessage(QString* text = nullptr)
-{
-    QTimer::singleShot(0, makeCallback([text](Callback* callback) {
-        for (QWidget* widget : QApplication::topLevelWidgets()) {
-            if (widget->inherits("QMessageBox")) {
-                QMessageBox* messageBox = qobject_cast<QMessageBox*>(widget);
-                if (text) *text = messageBox->text();
-                messageBox->defaultButton()->click();
-            }
-        }
-        delete callback;
-    }), SLOT(call()));
-}
-
 //! Press "Yes" or "Cancel" buttons in modal send confirmation dialog.
 void ConfirmSend(QString* text = nullptr, bool cancel = false)
 {
@@ -264,7 +250,7 @@ void TestGUI()
     QCOMPARE(requestTableModel->rowCount({}), currentRowCount-1);
 }
 
-}
+} // namespace
 
 void WalletTests::walletTests()
 {