diff --git a/tests/unit/tests/unittests/designsystem/CMakeLists.txt b/tests/unit/tests/unittests/designsystem/CMakeLists.txt
index 113381a5554..bf2fcf2da24 100644
--- a/tests/unit/tests/unittests/designsystem/CMakeLists.txt
+++ b/tests/unit/tests/unittests/designsystem/CMakeLists.txt
@@ -1,8 +1,18 @@
 extend_qtc_test(unittest
-  DEPENDS
-    QmlDesignerUtils DesignSystem
   SOURCES
     dsthemegroup-test.cpp
     dsthememgr-test.cpp
     dsthemeqml-test.cpp
 )
+
+extend_qtc_test(unittest
+  SOURCES_PREFIX "${QML_DESIGNER_DIRECTORY}/libs/designsystem"
+  INCLUDES "${QML_DESIGNER_DIRECTORY}/libs/designsystem"
+  DEFINES DESIGNSYSTEM_STATIC_LIBRARY
+  DEPENDS
+    Qt::Core Qt::Widgets QmlDesignerUtils TestDesignerCore
+  SOURCES
+    dsconstants.h
+    dsthemegroup.h dsthemegroup.cpp
+    dsthememanager.h dsthememanager.cpp
+)
diff --git a/tests/unit/tests/unittests/designsystem/dsthemegroup-test.cpp b/tests/unit/tests/unittests/designsystem/dsthemegroup-test.cpp
index bf4c0f14788..8908ce38338 100644
--- a/tests/unit/tests/unittests/designsystem/dsthemegroup-test.cpp
+++ b/tests/unit/tests/unittests/designsystem/dsthemegroup-test.cpp
@@ -12,19 +12,28 @@ using QmlDesigner::DSThemeGroup;
 using QmlDesigner::ThemeProperty;
 
 namespace {
-constexpr const char testPropertyNameFoo[] = "propFoo";
-constexpr const char testPropertyNameBar[] = "propBar";
+QByteArray testPropertyNameFoo = "propFoo";
+QByteArray testPropertyNameBar = "propBar";
 
 constexpr QmlDesigner::ThemeId themeId1 = 0;
 constexpr QmlDesigner::ThemeId themeId2 = 1;
 
-MATCHER_P3(HasPropertyCount, themeId, themePropCount, totalPropsCount, "")
+MATCHER_P3(HasPropertyCount,
+           themeId,
+           themePropCount,
+           totalPropsCount,
+           std::string(negation ? "hasn't " : "has ") + "total property count "
+               + PrintToString(totalPropsCount) + " and theme property count "
+               + PrintToString(themePropCount))
 {
     const DSThemeGroup &group = arg;
     return group.count() == totalPropsCount && group.count(themeId) == themePropCount;
 }
 
-MATCHER_P2(HasThemeProperty, themeId, themeProp, "")
+MATCHER_P2(HasThemeProperty,
+           themeId,
+           themeProp,
+           std::string(negation ? "hasn't " : "has ") + PrintToString(themeProp))
 {
     const DSThemeGroup &group = arg;
     const std::optional<ThemeProperty> prop = group.propertyValue(themeId, themeProp.name);
diff --git a/tests/unit/tests/unittests/designsystem/dsthememgr-test.cpp b/tests/unit/tests/unittests/designsystem/dsthememgr-test.cpp
index 02a2e56cabc..638e31b9853 100644
--- a/tests/unit/tests/unittests/designsystem/dsthememgr-test.cpp
+++ b/tests/unit/tests/unittests/designsystem/dsthememgr-test.cpp
@@ -11,8 +11,6 @@
 
 #include <designsystem/dsthememanager.h>
 
-#include <format>
-
 using QmlDesigner::DSThemeManager;
 using QmlDesigner::GroupType;
 using QmlDesigner::Import;
@@ -30,9 +28,7 @@ MATCHER_P3(HasProperty,
            themeId,
            group,
            themeProp,
-           std::format("Collection {} have a property {}",
-                       (negation ? "Does't " : "Does "),
-                       PrintToString(themeProp)))
+           std::string(negation ? "hasn't " : "has ") + PrintToString(themeProp))
 {
     const DSThemeManager &mgr = arg;
     const std::optional<ThemeProperty> prop = mgr.property(themeId, group, themeProp.name);
diff --git a/tests/unit/tests/unittests/designsystem/dsthemeqml-test.cpp b/tests/unit/tests/unittests/designsystem/dsthemeqml-test.cpp
index 602a1b356d8..5951ee830c0 100644
--- a/tests/unit/tests/unittests/designsystem/dsthemeqml-test.cpp
+++ b/tests/unit/tests/unittests/designsystem/dsthemeqml-test.cpp
@@ -13,8 +13,9 @@
 #include <designsystem/dsthemegroup.h>
 #include <designsystem/dsthememanager.h>
 
-#include <format>
 #include <functional>
+#include <string>
+#include <string_view>
 
 using QmlDesigner::DSThemeManager;
 using QmlDesigner::GroupType;
@@ -22,40 +23,24 @@ using QmlDesigner::Import;
 using QmlDesigner::ModelNode;
 using QmlDesigner::ThemeProperty;
 
-template<>
-struct std::formatter<QByteArray> : std::formatter<std::string>
-{
-    template<typename FormatContext>
-    auto format(const QByteArray &ba, FormatContext &ctx) const
-    {
-        return std::formatter<std::string>::format(ba.toStdString(), ctx);
-    }
-};
-
 namespace {
-
-static std::string formatedPropStr(const char tag[], const char name[], const QVariant &v)
+std::string formatedPropStr(std::string tag, const QByteArray &name, const QVariant &value)
 {
-    return std::format("{}Property({}, {})", tag, name, v.toString().toStdString());
+    return tag + "Property(" + name.toStdString() + ", " + value.toString().toStdString() + ")";
 }
 
-static auto bindingPropStr = std::bind(&formatedPropStr,
-                                       "Binding",
-                                       std::placeholders::_1,
-                                       std::placeholders::_2);
-static auto variantPropStr = std::bind(&formatedPropStr,
-                                       "Variant",
-                                       std::placeholders::_1,
-                                       std::placeholders::_2);
+auto bindingPropStr = std::bind_front(&formatedPropStr, "Binding");
+auto variantPropStr = std::bind_front(&formatedPropStr, "Variant");
 
-constexpr const char testPropertyName1[] = "prop1";
-constexpr const char darkThemeName[] = "dark";
+QByteArray testPropertyName1 = "prop1";
+QByteArray darkThemeName = "dark";
 constexpr QmlDesigner::ThemeId testThemeId = 1;
 
 MATCHER_P2(HasNodeProperty,
            name,
            typeName,
-           std::format("{} have node {} with type {})", (negation ? "Does't " : "Does "), name, typeName))
+           std::string(negation ? "hasn't node " : "has node ") + name.toStdString()
+               + std::string(" with type ") + typeName)
 {
     ModelNode n = arg;
     return n.hasNodeProperty(name) && n.nodeProperty(name).modelNode().isValid()
@@ -65,7 +50,7 @@ MATCHER_P2(HasNodeProperty,
 MATCHER_P2(HasBindingProperty,
            name,
            value,
-           std::format("{} have {})", (negation ? "Does't " : "Does "), bindingPropStr(name, value)))
+           std::string(negation ? "hasn't " : "has ") + bindingPropStr(name, value))
 {
     ModelNode n = arg;
     return n.hasBindingProperty(name) && n.bindingProperty(name).expression() == value;
@@ -74,7 +59,7 @@ MATCHER_P2(HasBindingProperty,
 MATCHER_P2(HasVariantProperty,
            name,
            value,
-           std::format("{} have {})", (negation ? "Does't " : "Does "), variantPropStr(name, value)))
+           std::string(negation ? "hasn't " : "has ") + variantPropStr(name, value))
 {
     ModelNode n = arg;
     return n.hasVariantProperty(name) && n.variantProperty(name).value() == value;
@@ -83,10 +68,8 @@ MATCHER_P2(HasVariantProperty,
 MATCHER_P2(HasGroupVariantProperty,
            groupName,
            themeProp,
-           std::format("{} have node {} with {})",
-                       (negation ? "Does't " : "Does "),
-                       groupName.constData(),
-                       PrintToString(themeProp)))
+           std::string(negation ? "hasn't node " : "has node ") + groupName.toStdString() + " with "
+               + PrintToString(themeProp))
 {
     ModelNode n = arg;
 
@@ -99,10 +82,8 @@ MATCHER_P2(HasGroupVariantProperty,
 MATCHER_P2(HasGroupBindingProperty,
            groupName,
            themeProp,
-           std::format("{} have node {} with {})",
-                       (negation ? "Does't " : "Does "),
-                       groupName.constData(),
-                       PrintToString(themeProp)))
+           std::string(negation ? "hasn't node " : "has node ") + groupName.toStdString() + " with "
+               + PrintToString(themeProp))
 {
     ModelNode n = arg;