Plugin wizard: Fix missing include, add some test infrastructure

Just basic CMake setup that is needed for actually adding tests.

Change-Id: Ief778c28f27ff122c82a190a334b7a932bead658
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

share/qtcreator/templates/wizards/qtcreatorplugin/CMakeLists.txt

@@ -22,6 +22,23 @@ find_package(QtCreator REQUIRED COMPONENTS Core)
 find_package(QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets)
 set(QtX Qt${QT_VERSION_MAJOR})
 
+# Add a CMake option that enables building your plugin with tests.
+# You don't want your released plugin binaries to contain tests,
+# so make that default to 'NO'.
+# Enable tests by passing -DWITH_TESTS=ON to CMake.
+option(WITH_TESTS "Builds with tests" NO)
+
+if(WITH_TESTS)
+  # Look for QtTest
+  find_package(${QtX} REQUIRED COMPONENTS Test)
+
+  # Tell CMake functions like add_qtc_plugin about the QtTest component.
+  set(IMPLICIT_DEPENDS Qt::Test)
+
+  # Enable ctest for auto tests.
+  enable_testing()
+endif()
+
 add_qtc_plugin(%{PluginName}
   PLUGIN_DEPENDS
     QtCreator::Core

share/qtcreator/templates/wizards/qtcreatorplugin/myplugin_global.h

@@ -6,6 +6,8 @@
 #define %{GLOBAL_GUARD}
 @endif
 
+#include <qglobal.h>
+
 #if defined(%{LibraryDefine})
 #  define %{LibraryExport} Q_DECL_EXPORT
 #else