Add a test to see whether generators can be loaded

REVIEW: 123466

autotests/CMakeLists.txt

@@ -62,3 +62,9 @@ ecm_add_test(mainshelltest.cpp ../shell/okular_main.cpp ../shell/shellutils.cpp
     TEST_NAME "mainshelltest"
     LINK_LIBRARIES Qt5::Test KF5::Activities okularpart okularcore
 )
+
+ecm_add_test(generatorstest.cpp
+    TEST_NAME "generatorstest"
+    LINK_LIBRARIES Qt5::Test KF5::CoreAddons okularcore
+)
+target_compile_definitions(generatorstest PRIVATE GENERATORS_BUILD_DIR="${CMAKE_BINARY_DIR}/generators")

autotests/generatorstest.cpp

@@ -0,0 +1,73 @@
+/***************************************************************************
+ *   Copyright (C) 2015 by Alex Richardson <arichardson.kde@gmail.com>     *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ ***************************************************************************/
+
+#include <QtTest/QTest>
+#include <QDirIterator>
+#include <QDebug>
+#include <QStringList>
+#include <KPluginFactory>
+#include <KPluginLoader>
+
+#include "../generator.h"
+
+class GeneratorsTest : public QObject
+{
+    Q_OBJECT
+private slots:
+    void testLoadsCorrectly();
+};
+
+void GeneratorsTest::testLoadsCorrectly()
+{
+    QVERIFY2(QDir(GENERATORS_BUILD_DIR).exists(), GENERATORS_BUILD_DIR);
+    // find all possible generators in $CMAKE_BINARY_DIR/generators
+    // We can't simply hardcore the list of generators since some might not be built
+    // depending on which dependencies were found by CMake
+    QStringList generatorLibs;
+    QDirIterator it(GENERATORS_BUILD_DIR, QDir::Files | QDir::Executable, QDirIterator::Subdirectories);
+    while (it.hasNext()) {
+        it.next();
+        if (QLibrary::isLibrary(it.fileName())) {
+            if (it.fileName().startsWith(QLatin1String("kio_"))) {
+                continue; // don't check kio_msits.so
+            }
+            generatorLibs <<  it.fileName();
+        }
+    }
+    int failures = 0;
+    int successful = 0;
+    foreach (const QString& lib, generatorLibs) {
+        KPluginLoader loader(lib);
+        QVERIFY(!loader.fileName().isEmpty());
+        auto factory = loader.factory();
+        if (!factory) {
+            qWarning() << "Could not get KPluginFactory for" << lib;
+            failures++;
+            continue;
+        }
+        Okular::Generator* generator = factory->create<Okular::Generator>();
+        if (!generator) {
+            qWarning() << "Failed to cast" << lib << "to Okular::Generator";
+            // without the necessary Q_INTERFACES() qobject_cast fails!
+            auto obj = factory->create<QObject>();
+            qDebug() << "Object is of type " << obj->metaObject()->className();
+            qDebug() << "dynamic_cast:" << dynamic_cast<Okular::Generator*>(obj);
+            qDebug() << "qobject_cast:" << qobject_cast<Okular::Generator*>(obj);
+            failures++;
+            continue;
+        }
+        successful++;
+    }
+    qDebug() << "Successfully loaded" << successful << "generators";
+    QCOMPARE(failures, 0);
+}
+
+QTEST_MAIN(GeneratorsTest)
+
+#include "generatorstest.moc"