wasm tests: Add test for making network request

Add test for making network request via Emscripten Fetch API on
main and background thread.

Task-number: QTBUG-118225
Change-Id: I7c3923493818e75a5c16e4e5f553a69cb1438c44
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
Reviewed-by: Piotr Wierciński <piotr.wiercinski@qt.io>

tests/auto/wasm/CMakeLists.txt

@@ -11,6 +11,18 @@ if(NOT QT_BUILD_STANDALONE_TESTS AND NOT QT_BUILDING_QT)
     find_package(Qt6BuildInternals REQUIRED COMPONENTS STANDALONE_TEST)
 endif()
 
+qt_internal_add_test(tst_fetchapi
+    SOURCES
+        tst_fetchapi.cpp
+    DEFINES
+        QT_NO_FOREACH
+    LIBRARIES
+        Qt::GuiPrivate
+        Qt::Network
+    PUBLIC_LIBRARIES
+        Qt::Core
+)
+
 qt_internal_add_test(tst_localfileapi
     SOURCES
         tst_localfileapi.cpp

tests/auto/wasm/tst_fetchapi.cpp

@@ -0,0 +1,85 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2016 Intel Corporation.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QTest>
+#include <QEventLoop>
+#include <QNetworkReply>
+#include <QNetworkRequest>
+#include <QScopedPointer>
+
+#include <memory>
+
+namespace {
+
+const QUrl URL = QUrl("http://localhost:6931/test_batch.html");
+
+class BackgroundThread : public QThread
+{
+    Q_OBJECT
+    void run() override
+    {
+        manager = std::make_unique<QNetworkAccessManager>();
+        eventLoop = std::make_unique<QEventLoop>();
+        reply = manager->get(request);
+        QObject::connect(reply, &QNetworkReply::finished, this, &BackgroundThread::requestFinished);
+        eventLoop->exec();
+    }
+
+    void requestFinished()
+    {
+        eventLoop->quit();
+    }
+
+public:
+    QNetworkReply *reply{ nullptr };
+
+private:
+    std::unique_ptr<QNetworkAccessManager> manager;
+    std::unique_ptr<QEventLoop> eventLoop;
+    QNetworkRequest request{ URL };
+};
+
+} // namespace
+
+class tst_FetchApi : public QObject
+{
+    Q_OBJECT
+public:
+    tst_FetchApi() = default;
+
+private Q_SLOTS:
+    void sendRequestOnMainThread();
+    void sendRequestOnBackgroundThread();
+};
+
+void tst_FetchApi::sendRequestOnMainThread()
+{
+    QNetworkAccessManager manager;
+    QNetworkRequest request(URL);
+    QNetworkReply *reply = manager.get(request);
+
+    QEventLoop loop;
+    QObject::connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
+    loop.exec();
+
+    QVERIFY(reply != nullptr);
+    QVERIFY(reply->error() == QNetworkReply::NoError);
+}
+
+void tst_FetchApi::sendRequestOnBackgroundThread()
+{
+    QEventLoop mainEventLoop;
+    BackgroundThread *backgroundThread = new BackgroundThread();
+    connect(backgroundThread, &BackgroundThread::finished, &mainEventLoop, &QEventLoop::quit);
+    connect(backgroundThread, &BackgroundThread::finished, backgroundThread, &QObject::deleteLater);
+    backgroundThread->start();
+    mainEventLoop.exec();
+
+    QVERIFY(backgroundThread != nullptr);
+    QVERIFY(backgroundThread->reply != nullptr);
+    QVERIFY(backgroundThread->reply->error() == QNetworkReply::NoError);
+}
+
+QTEST_MAIN(tst_FetchApi);
+#include "tst_fetchapi.moc"