Try to use the build konsolepart for tests.

Move the build directory to the beginning of libraryPaths() so that
the build konsolepart is used.  The CI installs and then runs tests,
so leave other paths as-is.
Also, fail instead of skipping if konsolepart is not found.

src/autotests/PartTest.cpp

@@ -40,6 +40,24 @@
 
 using namespace Konsole;
 
+void PartTest::initTestCase()
+{
+    /* Try to test against build konsolepart, so move directory containing
+      executable to front of libraryPaths.  KPluginLoader should find the
+      part first in the build dir over the system installed ones.
+      I believe the CI installs first and then runs the test so the other
+      paths can not be removed.
+    */
+    const auto libraryPaths = QCoreApplication::libraryPaths();
+    auto buildPath = libraryPaths.last();
+    QCoreApplication::removeLibraryPath(buildPath);
+    // konsolepart.so is in ../autotests/
+    if (buildPath.endsWith(QStringLiteral("/autotests"))) {
+        buildPath.chop(10);
+    }
+    QCoreApplication::addLibraryPath(buildPath);
+}
+
 void PartTest::testFd()
 {
     // find ping
@@ -62,7 +80,7 @@ void PartTest::testFd()
     // create a Konsole part and attempt to connect to it
     KParts::Part *terminalPart = createPart();
     if (terminalPart == nullptr) { // not found
-        QSKIP("konsolepart not found.");
+        QFAIL("konsolepart not found.");
         return;
     }
 
@@ -97,13 +115,15 @@ void PartTest::testFd()
     ptyProcess.waitForFinished(1000);
 }
 
+
 KParts::Part *PartTest::createPart()
 {
-    KService::Ptr service = KService::serviceByDesktopName(QStringLiteral("konsolepart"));
-    if (!service) {       // not found
+    auto konsolePartPlugin = KPluginLoader::findPlugin(QStringLiteral("konsolepart"));
+    if (konsolePartPlugin.isNull()) {
         return nullptr;
     }
-    KPluginFactory *factory = KPluginLoader(service->library()).factory();
+
+    KPluginFactory *factory = KPluginLoader(konsolePartPlugin).factory();
     if (factory == nullptr) {       // not found
         return nullptr;
     }

src/autotests/PartTest.h

@@ -33,6 +33,7 @@ class PartTest : public QObject
     Q_OBJECT
 
 private Q_SLOTS:
+    void initTestCase();
     void testFd();
 
 private: