test, qt: Add tests for GUIUtil::extractFirstSuffixFromFilter

Author: w0xlt

src/qt/test/optiontests.cpp

@@ -4,6 +4,7 @@
 
 #include <init.h>
 #include <qt/bitcoin.h>
+#include <qt/guiutil.h>
 #include <qt/test/optiontests.h>
 #include <test/util/setup_common.h>
 #include <util/system.h>
@@ -122,3 +123,12 @@ void OptionTests::parametersInteraction()
     QVERIFY(!settings.contains("fListen"));
     gArgs.ClearPathCache();
 }
+
+void OptionTests::extractFilter()
+{
+    QString filter = QString("Partially Signed Transaction (Binary) (*.psbt)");
+    QCOMPARE(GUIUtil::ExtractFirstSuffixFromFilter(filter), "psbt");
+
+    filter = QString("Image (*.png *.jpg)");
+    QCOMPARE(GUIUtil::ExtractFirstSuffixFromFilter(filter), "png");
+}

src/qt/test/optiontests.h

@@ -22,6 +22,7 @@ private Q_SLOTS:
     void migrateSettings();
     void integerGetArgBug();
     void parametersInteraction();
+    void extractFilter();
 
 private:
     interfaces::Node& m_node;