qt, test: use regex search in apptests

use the FindInConsole function to regex search for values in apptests instead of Univalue read.

Author: jarolrod

src/qt/test/apptests.cpp

@@ -12,7 +12,6 @@
 #include <qt/rpcconsole.h>
 #include <shutdown.h>
 #include <test/util/setup_common.h>
-#include <univalue.h>
 #include <validation.h>
 
 #if defined(HAVE_CONFIG_H)
@@ -48,10 +47,9 @@ void TestRpcCommand(RPCConsole* console)
     QTest::keyClicks(lineEdit, "getblockchaininfo");
     QTest::keyClick(lineEdit, Qt::Key_Return);
     loop.exec();
-    QString output = messagesWidget->toPlainText();
-    UniValue value;
-    value.read(output.right(output.size() - output.lastIndexOf(QChar::ObjectReplacementCharacter) - 1).toStdString());
-    QCOMPARE(value["chain"].get_str(), std::string("regtest"));
+    const QString output = messagesWidget->toPlainText();
+    const QString pattern = "\"chain\": \"(\\w+)\"";
+    QCOMPARE(FindInConsole(output, pattern), "regtest");
 }
 } // namespace