KIO: enable test (#3111)

* Enable test, add LIBRARY_PATH, add TEST_REQ

* Notice about the tests

kde-frameworks/kio/kio-5.50.0.recipe

@@ -126,6 +126,10 @@ BUILD_PREREQUIRES="
 	cmd:python2
 	"
 
+TEST_REQUIRES="
+	qthaikuplugins$secondaryArchSuffix #it opens windows during the tests, maybe we don't want that on the buildbots.
+	"
+
 BUILD()
 {
 	mkdir -p build
@@ -136,7 +140,7 @@ BUILD()
 		-DKAUTH_HELPER_INSTALL_DIR:PATH=$addOnsDir/Qt5/kauth/helper \
 		-DECM_MKSPECS_INSTALL_DIR=$dataDir/Qt5/mkspecs \
 		-DECM_DIR=/system/data/cmake/Modules/ECM/cmake \
-		-DBUILD_TESTING=OFF
+		-DBUILD_TESTING=ON
 	make $jobArgs
 }
 
@@ -164,6 +168,7 @@ INSTALL()
 
 TEST()
 {
+	export LIBRARY_PATH="$sourceDir/build/bin${LIBRARY_PATH:+:$LIBRARY_PATH}"
 	cd build
 	make test
 }