Try to fix CircleCI linux build

CMakeLists.txt

@@ -171,9 +171,6 @@ ENDIF()
 # Resolve Qt5::qmake to full path for use in packaging scripts
 GET_TARGET_PROPERTY(QT_QMAKE_EXECUTABLE "${Qt5Core_QMAKE_EXECUTABLE}" IMPORTED_LOCATION)
 
-FIND_PACKAGE(Qt5Test)
-SET(QT_QTTEST_LIBRARY Qt5::Test)
-
 # check for libsndfile
 FIND_PACKAGE(SndFile REQUIRED)
 IF(NOT SNDFILE_FOUND)

tests/CMakeLists.txt

@@ -6,6 +6,8 @@ INCLUDE_DIRECTORIES("${CMAKE_BINARY_DIR}/src")
 
 SET(CMAKE_CXX_STANDARD 11)
 
+FIND_PACKAGE(Qt5Test)
+
 SET(CMAKE_AUTOMOC ON)
 
 ADD_EXECUTABLE(tests
@@ -24,5 +26,5 @@ ADD_EXECUTABLE(tests
 TARGET_COMPILE_DEFINITIONS(tests
 	PRIVATE $<TARGET_PROPERTY:lmmsobjs,INTERFACE_COMPILE_DEFINITIONS>
 )
-TARGET_LINK_LIBRARIES(tests ${QT_LIBRARIES} ${QT_QTTEST_LIBRARY})
+TARGET_LINK_LIBRARIES(tests ${QT_LIBRARIES} Qt5::Test)
 TARGET_LINK_LIBRARIES(tests ${LMMS_REQUIRED_LIBS})

tests/src/core/MemoryPoolTest.cpp

@@ -44,7 +44,7 @@ private slots:
 			ptrs.push(pool.allocate_bounded());
 			QVERIFY(ptrs.top());
 		}
-		QCOMPARE(pool.allocate_bounded(), nullptr);
+		QCOMPARE(pool.allocate_bounded(), static_cast<T*>(nullptr));
 		ptrs.push(pool.allocate());
 		QVERIFY(ptrs.top());