diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1554107..1e7c069 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -39,4 +39,13 @@ target_link_libraries(UnitTests Catch2::Catch2)
 
 include(CTest)
 include(Catch)
-catch_discover_tests(UnitTests)
\ No newline at end of file
+catch_discover_tests(UnitTests)
+
+if (ENABLE_COVERAGE)
+    set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/../external/codecov/cmake" ${CMAKE_MODULE_PATH})
+    list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/CMake")
+    find_package(codecov)
+    add_coverage(UnitTests)
+    list(APPEND LCOV_REMOVE_PATTERNS "/usr/")
+    coverage_evaluate()
+endif()
diff --git a/src/internal.cpp b/src/internal.cpp
index e6ff8e8..f576563 100644
--- a/src/internal.cpp
+++ b/src/internal.cpp
@@ -8,6 +8,24 @@ namespace vkvm {
 
     Impl impl;
 
+    auto setDefaultValues() -> void {
+        impl.localMemoryWarn = false;
+        if (getSharedMemory() != nullptr) {
+            setMode(GraphicMode::RGB);
+            setCharactersPerRow(60);
+            setCharactersPerColumn(20);
+            setHeight(600);
+            setWidth(800);
+            setMousePosition(42, 42);
+            setBackgroundColor(black);
+            setForegroundColor(white);
+            setRedrawInterval(20);
+            setTimerInterruptInterval(10);
+            setFont(FontType(3, "", 0, 0));
+        }
+        impl.localMemoryWarn = true;
+    }
+
     auto sendSignal(pid_t pid, int signalNumber) -> void {
         kill(pid, signalNumber);
     }
diff --git a/src/internal.hpp b/src/internal.hpp
index a84676a..ff57774 100644
--- a/src/internal.hpp
+++ b/src/internal.hpp
@@ -65,6 +65,9 @@ constexpr int keyboardBufferSize = 16;
 
     extern Impl impl;
 
+
+    auto setDefaultValues() -> void;
+
 /**
  * send a signal to a process
  * @param pid of the process to which the signal is send
diff --git a/src/vkvm.cpp b/src/vkvm.cpp
index 9e42e38..837500b 100644
--- a/src/vkvm.cpp
+++ b/src/vkvm.cpp
@@ -15,24 +15,6 @@ namespace vkvm {
         setDefaultValues();
     }
 
-    auto setDefaultValues() -> void {
-        impl.localMemoryWarn = false;
-        if (getSharedMemory() != nullptr) {
-            setMode(GraphicMode::RGB);
-            setCharactersPerRow(60);
-            setCharactersPerColumn(20);
-            setHeight(600);
-            setWidth(800);
-            setMousePosition(42, 42);
-            setBackgroundColor(black);
-            setForegroundColor(white);
-            setRedrawInterval(20);
-            setTimerInterruptInterval(10);
-            setFont(FontType(3, "", 0, 0));
-        }
-        impl.localMemoryWarn = true;
-    }
-
     auto registerEvent(EventType type, const std::function<void()> &handler) -> bool {
         int signum = SIGUSR1 + impl.eventTable.size();
         auto ivt = getInterruptTable();
@@ -205,7 +187,7 @@ namespace vkvm {
     }
 
     auto reset() -> void {
-        //TODO(julian): reset
+        setDefaultValues();
     }
 
     auto getWidth() -> int {
diff --git a/src/vkvm.hpp b/src/vkvm.hpp
index b882206..7c50541 100644
--- a/src/vkvm.hpp
+++ b/src/vkvm.hpp
@@ -28,7 +28,6 @@ namespace vkvm {
  */
     auto initialize(int pid) -> void;
 
-    auto setDefaultValues() -> void;
 
 /**
  * set pixel at a x,y position to a certain color.
diff --git a/test/default_test.cpp b/test/default_test.cpp
new file mode 100644
index 0000000..eac0105
--- /dev/null
+++ b/test/default_test.cpp
@@ -0,0 +1,70 @@
+#include "../src/internal.hpp"
+#include "../src/vkvm.hpp"
+#include <catch2/catch.hpp>
+
+TEST_CASE("Default values") {
+    vkvm::initialize(0);
+
+    SECTION("before") {
+        REQUIRE(vkvm::getMode() == vkvm::RGB);
+        REQUIRE(vkvm::getCharactersPerRow() == 60);
+        REQUIRE(vkvm::getCharactersPerColumn() == 20);
+        REQUIRE(vkvm::getHeight() == 600);
+        REQUIRE(vkvm::getWidth() == 800);
+        REQUIRE(vkvm::getMousePosition().x == 42);
+        REQUIRE(vkvm::getMousePosition().y == 42);
+        REQUIRE(vkvm::getBackgroundColor() == vkvm::black);
+        REQUIRE(vkvm::getForegroundColor() == vkvm::white);
+        REQUIRE(vkvm::getRedrawInterval() == 20);
+        REQUIRE(vkvm::getTimerInterruptInterval() == 10);
+        REQUIRE(vkvm::getFont().getId() == 3);
+    }
+
+    SECTION("change") {
+        vkvm::setMode(vkvm::TwoColors);
+        vkvm::setCharactersPerRow(100);
+        vkvm::setCharactersPerColumn(100);
+        vkvm::setHeight(40);
+        vkvm::setWidth(40);
+        vkvm::setMousePosition(41, 43);
+        vkvm::setBackgroundColor(vkvm::red);
+        vkvm::setForegroundColor(vkvm::blue);
+        vkvm::setRedrawInterval(1);
+        vkvm::setTimerInterruptInterval(2);
+        vkvm::setFont(vkvm::FontType(5, "", 5, 5));
+
+
+
+        REQUIRE(vkvm::getMode() == vkvm::TwoColors);
+        REQUIRE(vkvm::getCharactersPerRow() == 100);
+        REQUIRE(vkvm::getCharactersPerColumn() == 100);
+        REQUIRE(vkvm::getHeight() == 40);
+        REQUIRE(vkvm::getWidth() == 40);
+        REQUIRE(vkvm::getMousePosition().x == 41);
+        REQUIRE(vkvm::getMousePosition().y == 43);
+        REQUIRE(vkvm::getBackgroundColor() == vkvm::red);
+        REQUIRE(vkvm::getForegroundColor() == vkvm::blue);
+        REQUIRE(vkvm::getRedrawInterval() == 1);
+        REQUIRE(vkvm::getTimerInterruptInterval() == 2);
+        REQUIRE(vkvm::getFont().getId() == 5);
+    }
+
+
+    SECTION("after") {
+        vkvm::reset();
+        REQUIRE(vkvm::getMode() == vkvm::RGB);
+        REQUIRE(vkvm::getCharactersPerRow() == 60);
+        REQUIRE(vkvm::getCharactersPerColumn() == 20);
+        REQUIRE(vkvm::getHeight() == 600);
+        REQUIRE(vkvm::getWidth() == 800);
+        REQUIRE(vkvm::getMousePosition().x == 42);
+        REQUIRE(vkvm::getMousePosition().y == 42);
+        REQUIRE(vkvm::getBackgroundColor() == vkvm::black);
+        REQUIRE(vkvm::getForegroundColor() == vkvm::white);
+        REQUIRE(vkvm::getRedrawInterval() == 20);
+        REQUIRE(vkvm::getTimerInterruptInterval() == 10);
+        REQUIRE(vkvm::getFont().getId() == 3);
+
+    }
+
+}