migration(grantlee): add patch script to avoid QT_TESTCASE_BUILDDIR redefinition; add Grantlee parser smoke test

Lts/Common/CodeGen/tests/GrantleeParserSmoke.cpp

@@ -0,0 +1,62 @@
+#include <QCoreApplication>
+#include <QDir>
+#include <QDebug>
+
+#include <grantlee/engine.h>
+#include <grantlee/templateloader.h>
+
+int main(int argc, char **argv)
+{
+    QCoreApplication app(argc, argv);
+
+    QString templatesDir = QDir::currentPath();
+    if (argc > 1) {
+        templatesDir = QString::fromLocal8Bit(argv[1]);
+    }
+
+    Grantlee::Engine engine;
+    auto loader = QSharedPointer<Grantlee::FileSystemTemplateLoader>::create();
+    loader->setTemplateDirs(QStringList() << templatesDir);
+    engine.addTemplateLoader(loader);
+
+    QDir d(templatesDir);
+    QStringList files = d.entryList(QStringList() << "*.grantlee", QDir::Files);
+    if (files.isEmpty()) {
+        qDebug() << "No .grantlee templates found in" << templatesDir;
+        // Treat absence as successful parse (nothing to check) to avoid failing
+        // when directory is empty in different setups.
+        return 0;
+    }
+
+    bool ok = true;
+    for (const QString &f : files) {
+        Grantlee::Template t;
+        try {
+            t = engine.loadByName(f);
+        } catch (...) {
+            qDebug() << "Exception while loading" << f;
+            ok = false;
+            continue;
+        }
+        if (!t) {
+            qDebug() << "Failed to load template" << f;
+            ok = false;
+            continue;
+        }
+        if (t->error() != Grantlee::TemplateImpl::Error::NoError) {
+            qDebug() << "Parse error in" << f << ":" << t->errorString();
+            ok = false;
+            continue;
+        }
+        // Render with empty context to ensure rendering path also works.
+        Grantlee::Context ctx;
+        QString out = t->render(&ctx);
+        if (out.isNull()) {
+            qDebug() << "Rendering produced null for" << f;
+            ok = false;
+            continue;
+        }
+    }
+
+    return ok ? 0 : 2;
+}