Make QTest dependency optional

Skip building the autotests in case QTest is not found.

smb/kdsoap-ws-discovery-client/CMakeLists.txt

@@ -32,7 +32,7 @@ include(KDECMakeSettings)
 include(GenerateExportHeader)
 
 set(REQUIRED_QT_VERSION 5.9.0)
-find_package(Qt5 ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE COMPONENTS Core Network Test Xml)
+find_package(Qt5 ${REQUIRED_QT_VERSION} REQUIRED NO_MODULE COMPONENTS Core Network Xml)
 
 find_package(KDSoap 1.9.0 REQUIRED)
 set_package_properties(KDSoap PROPERTIES
@@ -42,6 +42,10 @@ set_package_properties(KDSoap PROPERTIES
     PURPOSE "Support for SOAP client protocol"
 )
 
+if (BUILD_TESTING)
+    find_package(Qt5 ${REQUIRED_QT_VERSION} CONFIG REQUIRED Test)
+endif()
+
 include(ECMSetupVersion)
 include(ECMGenerateHeaders)
 include(ECMQtDeclareLoggingCategory)