QT creator using static library - c++

Question

I am trying to follow qt creators instructions to create static libraries.
https://wiki.qt.io/How_to_create_a_library_with_Qt_and_use_it_in_an_application
it shows the below for lines to include in my libraries .pro
TEMPLATE = lib
CONFIG += staticlib
# Input
HEADERS += test.h
SOURCES += test.cpp
and for the apps .pro
TEMPLATE = app
TARGET =
CONFIG += console
# Input
SOURCES += main.cpp
INCLUDEPATH += ../staticLibrary
LIBS += -L../staticLibrary/debug -lstaticLibrary
I have
library's .pro
QT -= gui
TARGET = test
TEMPLATE = lib
CONFIG += staticlib
SOURCES += test.cpp
HEADERS += test.h
unix {
target.path = /usr/lib
INSTALLS += target
}
app's .pro
QT += core
QT -= gui
CONFIG += c++11
TARGET = TestLink
CONFIG += console
CONFIG -= app_bundle
TEMPLATE = app
SOURCES += main.cpp
INCLUDEPATH += ../test // ADDED BY ME
LIBS += -L../test/debug -ltest //ADDED BY ME
// LIBS += -L../test/debug -ltest.a //ALSO TRIED .a
My library is test. Both folder, the main app and the library are in the same folder. When I now include the .h
#include "test.h"
I get
C:\CPP\Test\TestLink\main.cpp:3: error: C1083: Cannot open include file: 'test.h': No such file or directory
It seems I am following the isntructions here. What am I missing?
This here also suggests the two lines I added should do the job
Using a static library in Qt Creator