diff --git a/.gitignore b/.gitignore
index cf71be7..5fc3c13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,12 @@
+# build
 edit
 CMakeLists.txt.user
 /msbuild.log
 /*std*.log
 /*build
+
+# python
+tests/**/__pycache__
+
+# IDE
+.vscode
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 8389d7c..0d3ae26 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -2,14 +2,25 @@ cmake_minimum_required(VERSION 3.16)
 
 set(PYLIB_DIR ${CMAKE_CURRENT_BINARY_DIR}/pylibs)
 
-add_custom_target(pytest
-	${CMAKE_COMMAND} -E env PYTHONPATH=${PYLIB_DIR}
+if (TARGET uibase)
+	set(UIBASE_PATH $<TARGET_FILE:uibase>)
+else()
+	set(UIBASE_PATH "${MO2_INSTALL_PATH}/bin/uibase.dll")
+endif()
+
+add_custom_target(pytest EXCLUDE_FROM_ALL
+	${CMAKE_COMMAND} -E env
+		PYTHONPATH="${PYLIB_DIR}\\;$<TARGET_FILE_DIR:mobase>"
+		"UIBASE_PATH=${UIBASE_PATH}" "QT_ROOT=${QT_ROOT}"
 		${CMAKE_CURRENT_BINARY_DIR}/pylibs/bin/pytest.exe ${CMAKE_CURRENT_SOURCE_DIR}/../tests -s
-	WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+	WORKING_DIRECTORY ${MO2_INSTALL_PATH}
+
 )
 mo2_python_pip_install(pytest
 	DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/pylibs
 	PACKAGES pytest PyQt6==6.3.0)
+add_dependencies(pytest mobase)
+
 
 file(GLOB test_files "test_*.cpp")
 foreach (test_file ${test_files})
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..a630475
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,7 @@
+import os
+from pathlib import Path
+
+
+def pytest_configure():
+    os.add_dll_directory(Path(os.getenv("QT_ROOT")).joinpath("bin"))
+    os.add_dll_directory(Path(os.getenv("UIBASE_PATH")).parent)
diff --git a/tests/test_guessed_string.cpp b/tests/test_guessed_string.cpp
new file mode 100644
index 0000000..4256989
--- /dev/null
+++ b/tests/test_guessed_string.cpp
@@ -0,0 +1,34 @@
+#include "pybind11_qt/pybind11_qt.h"
+
+#include <pybind11/functional.h>
+#include <pybind11/pybind11.h>
+
+#include "guessedvalue.h"
+
+using namespace MOBase;
+
+PYBIND11_MODULE(guessed_string, m)
+{
+    m.def("get_value", [](GuessedValue<QString> const& value) {
+        return value.operator const QString&();
+    });
+    m.def("get_variants", [](GuessedValue<QString> const& value) {
+        return value.variants();
+    });
+
+    m.def("set_from_callback",
+          [](GuessedValue<QString>& value,
+             std::function<void(GuessedValue<QString>&)> const& fn) {
+              fn(value);
+          });
+
+    // note: the function needs to take the guessed string by pointer if constructed
+    // from C++, this is to be taken into account when calling Python function (cf.
+    // installers)
+    m.def("get_from_callback",
+          [](std::function<void(GuessedValue<QString>*)> const& fn) {
+              GuessedValue<QString> value;
+              fn(&value);
+              return (QString)value;
+          });
+}
diff --git a/tests/test_guessed_string.py b/tests/test_guessed_string.py
new file mode 100644
index 0000000..3f335f2
--- /dev/null
+++ b/tests/test_guessed_string.py
@@ -0,0 +1,35 @@
+import mobase
+import pytest
+
+m = pytest.importorskip("mobase_tests.guessed_string")
+
+
+def test_guessed_string():
+
+    # empty string
+    gs = mobase.GuessedString()
+
+    assert len(gs.variants()) == 0
+    assert not gs.variants()
+    assert str(gs) == ""
+
+    # automatic conversion from string
+    assert m.get_value("test") == "test"
+    assert m.get_variants("test") == {"test"}
+
+    # update
+    gs = mobase.GuessedString("fallback", mobase.GuessQuality.FALLBACK)
+    assert str(gs) == "fallback"
+
+    gs.update("good", mobase.GuessQuality.GOOD)
+    assert str(gs) == "good"
+    assert gs.variants() == {"fallback", "good"}
+
+    # back-and-forth
+    gs = mobase.GuessedString()
+    assert str(gs) == ""
+
+    m.set_from_callback(gs, lambda gs: gs.update("test"))
+    assert str(gs) == "test"
+
+    assert m.get_from_callback(lambda gs: gs.update("test")) == "test"