QCommandLineParser: fix crash if there's no QCoreApplication

It'll display <executable_name> instead in the help output.

Fixes: QTBUG-91430
Change-Id: Ib6211b24cdaa4683a4f62c90b5a1a20ba69f1cff
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/auto/corelib/tools/qcommandlineparser/tst_qcommandlineparser.cpp b/tests/auto/corelib/tools/qcommandlineparser/tst_qcommandlineparser.cpp
index f8366d4142..aea3550452 100644
--- a/tests/auto/corelib/tools/qcommandlineparser/tst_qcommandlineparser.cpp
+++ b/tests/auto/corelib/tools/qcommandlineparser/tst_qcommandlineparser.cpp
@@ -64,6 +64,7 @@ private slots:
     void testDefaultValue();
     void testProcessNotCalled();
     void testEmptyArgsList();
+    void testNoApplication();
     void testMissingOptionValue();
     void testStdinArgument_data();
     void testStdinArgument();
@@ -393,6 +394,34 @@ void tst_QCommandLineParser::testEmptyArgsList()
     QVERIFY(!parser.parse(QStringList())); // invalid call, argv[0] is missing
 }
 
+void tst_QCommandLineParser::testNoApplication()
+{
+    QCommandLineOption option(QStringLiteral("param"), QStringLiteral("Pass parameter to the backend."));
+    option.setValueName("key=value");
+    QCommandLineParser parser;
+    QVERIFY(parser.addOption(option));
+    {
+        QVERIFY(parser.parse(QStringList() << "tst" << "--param" << "key1=value1"));
+        QVERIFY(parser.isSet("param"));
+        QCOMPARE(parser.values("param"), QStringList() << "key1=value1");
+        QCOMPARE(parser.value("param"), QString("key1=value1"));
+    }
+    {
+        QVERIFY(parser.parse(QStringList() << "tst" << "--param" << "key1=value1" << "--param" << "key2=value2"));
+        QVERIFY(parser.isSet("param"));
+        QCOMPARE(parser.values("param"), QStringList() << "key1=value1" << "key2=value2");
+        QCOMPARE(parser.value("param"), QString("key2=value2"));
+    }
+
+    const QString expected =
+        "Usage: <executable_name> [options]\n"
+        "\n"
+        "Options:\n"
+        "  --param <key=value>  Pass parameter to the backend.\n";
+
+    QCOMPARE(parser.helpText(), expected);
+}
+
 void tst_QCommandLineParser::testMissingOptionValue()
 {
     QCoreApplication app(empty_argc, empty_argv);