QT project get broken when make it subdir project - qt

Question

In QT Creator I decided to create autotest project where my tests will sit. My first step was to make my main project subdirs,but when I added the subdirs template , project won't build. It seems all classes which inherit from QObject are now "unknown type".
Here is my main project .pro file:
QT += quick
QT += core gui
QT += network
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TEMPLATE = subdirs
# the line above breaks project. Whithout it project compiles...
CONFIG += c++11 qml_debug declarative_debug console
win32 {
LIBS += -lws2_32
}
# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
SOURCES += \
applicationservice.cpp \
blinkingtimer.cpp \
shapes/genericshape.cpp \
shapes/circle.cpp \
shapes/textprint.cpp \
shapes/tracksection.cpp \
shapes/triangle.cpp \
main.cpp \
shapes/square.cpp \
shapes/trainsignal.cpp \
cliarguments.cpp \
guimanager.cpp \
desktopgeometry.cpp \
tinyxml2/tinyxml2.cpp
RESOURCES += qml.qrc
# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =
# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
DISTFILES +=
HEADERS += \
applicationservice.h \
blinkingtimer.h \
customtypes.h \
shapes/genericshape.h \
shapes/circle.h \
shapes/textprint.h \
shapes/tracksection.h \
shapes/triangle.h \
shapes/square.h \
shapes/trainsignal.h \
cliarguments.h \
guimanager.h \
desktopgeometry.h \
tinyxml2/tinyxml2.h

Answer 1

A project cannot be both subdirs and app at the same time, which is what you're trying here.
The best way would be to move your main project into a subfolder (I've called it "App" here), same as your tests project ("Tests"). You then add an overarching subdirs project in the root folder:
Folder structure:
Rootdir/
|-- RootProject.pro
|-- App/
|-- App.pro
|-- <source files etc>
|-- Tests/
|-- Tests.pro
|-- <source files etc>
RootProject.pro
TEMPLATE = subdirs
SUBDIRS += \
App \
Tests \