diff --git a/include/fmi4cpp/fmi2/fmu.hpp b/include/fmi4cpp/fmi2/fmu.hpp
index 7526486..54fe8bb 100644
--- a/include/fmi4cpp/fmi2/fmu.hpp
+++ b/include/fmi4cpp/fmi2/fmu.hpp
@@ -26,7 +26,7 @@ class fmu : public virtual fmu_provider<model_description, cs_fmu, me_fmu>
     std::shared_ptr<const fmi4cpp::fmi2::model_description> modelDescription_;
 
 public:
-    explicit fmu(const fs::path& fmuPath);
+    explicit fmu(const fs::path& fmuPath, bool unzipFmu = true);
 
     [[nodiscard]] std::string get_model_description_xml() const;
     [[nodiscard]] std::shared_ptr<const fmi4cpp::fmi2::model_description> get_model_description() const override;
diff --git a/src/fmi4cpp/fmi2/fmu.cpp b/src/fmi4cpp/fmi2/fmu.cpp
index ae4ed46..6267af8 100644
--- a/src/fmi4cpp/fmi2/fmu.cpp
+++ b/src/fmi4cpp/fmi2/fmu.cpp
@@ -11,34 +11,38 @@
 using namespace fmi4cpp;
 using namespace fmi4cpp::fmi2;
 
-fmu::fmu(const fs::path& fmuPath)
+fmu::fmu(const fs::path& fmuPath, bool unzipFmu)
 {
-
-    if (!exists(fmuPath)) {
-        const auto err = "No such file '" + absolute(fmuPath).string() + "'!";
-        MLOG_FATAL(err);
-        throw std::runtime_error(err);
-    }
-
-    const std::string fmuName = fmuPath.stem().string();
-    fs::path tmpPath(fs::temp_directory_path() /= fs::path("fmi4cpp_" + fmuName + "_" + generate_simple_id(8)));
-
-    if (!create_directories(tmpPath)) {
-        const auto err = "Failed to create temporary directory '" + tmpPath.string() + "' !";
-        MLOG_FATAL(err);
-        throw std::runtime_error(err);
+    if (unzipFmu) {
+        if (!exists(fmuPath)) {
+            const auto err = "No such file '" + absolute(fmuPath).string() + "'!";
+            MLOG_FATAL(err);
+            throw std::runtime_error(err);
+        }
+
+        const std::string fmuName = fmuPath.stem().string();
+        fs::path tmpPath(fs::temp_directory_path() /= fs::path("fmi4cpp_" + fmuName + "_" + generate_simple_id(8)));
+
+        if (!create_directories(tmpPath)) {
+            const auto err = "Failed to create temporary directory '" + tmpPath.string() + "' !";
+            MLOG_FATAL(err);
+            throw std::runtime_error(err);
+        }
+
+        MLOG_DEBUG("Created temporary directory '" << tmpPath.string());
+
+        if (!unzip(fmuPath, tmpPath.string())) {
+            const auto err = "Failed to extract FMU '" + absolute(fmuPath).string() + "'!";
+            MLOG_FATAL(err);
+            throw std::runtime_error(err);
+        }
+
+        resource_ = std::make_shared<fmu_resource>(tmpPath);
+        modelDescription_ = std::move(parse_model_description(resource_->model_description_path()));
+    } else {
+        resource_ = std::make_shared<fmu_resource>(fmuPath);
+        modelDescription_ = std::move(parse_model_description(resource_->model_description_path()));
     }
-
-    MLOG_DEBUG("Created temporary directory '" << tmpPath.string());
-
-    if (!unzip(fmuPath, tmpPath.string())) {
-        const auto err = "Failed to extract FMU '" + absolute(fmuPath).string() + "'!";
-        MLOG_FATAL(err);
-        throw std::runtime_error(err);
-    }
-
-    resource_ = std::make_shared<fmu_resource>(tmpPath);
-    modelDescription_ = std::move(parse_model_description(resource_->model_description_path()));
 }
 
 std::string fmu::get_model_description_xml() const
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 6e8ad93..3fd03c6 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,7 +1,8 @@
 
 add_executable(test_controlled_temperature test_controlled_temperature.cpp)
-target_link_libraries(test_controlled_temperature PRIVATE fmi4cpp::fmi4cpp Catch2::Catch2)
+target_link_libraries(test_controlled_temperature PRIVATE fmi4cpp::fmi4cpp Catch2::Catch2 libzip::libzip)
 add_test(NAME test_controlled_temperature COMMAND test_controlled_temperature)
+target_include_directories(test_controlled_temperature PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../src)
 
 add_executable(test_model_description1 test_modeldescription1.cpp)
 target_link_libraries(test_model_description1 PRIVATE fmi4cpp::fmi4cpp Catch2::Catch2)
diff --git a/tests/test_controlled_temperature.cpp b/tests/test_controlled_temperature.cpp
index f8f4cdd..b015de0 100644
--- a/tests/test_controlled_temperature.cpp
+++ b/tests/test_controlled_temperature.cpp
@@ -1,5 +1,10 @@
 
 #include <fmi4cpp/fmi2/fmi2.hpp>
+#include <fmi4cpp/fs_portability.hpp>
+#include <fmi4cpp/mlog.hpp>
+#include <fmi4cpp/tools/os_util.hpp>
+#include <fmi4cpp/tools/simple_id.hpp>
+#include <fmi4cpp/tools/unzipper.hpp>
 
 #define CATCH_CONFIG_MAIN
 #include <catch2/catch.hpp>
@@ -37,5 +42,57 @@ TEST_CASE("ControlledTemperature_test1")
 
     CHECK(298.15 == Approx(ref));
 
+    CHECK(slave->terminate());
+}
+
+
+TEST_CASE("ControlledTemperature_test2")
+{
+    const std::string fmu_path = "../resources/fmus/2.0/cs/20sim/4.6.4.8004/"
+                                 "ControlledTemperature/ControlledTemperature.fmu";
+    namespace fs = std::filesystem;
+    if (!fs::exists(fmu_path)) {
+        const auto err = "No such file '" + fs::absolute(fmu_path).string() + "'!";
+        MLOG_FATAL(err);
+        throw std::runtime_error(err);
+    }
+
+    const std::string fmuName = fs::path(fmu_path).stem().string();
+    fs::path tmpPath(fs::temp_directory_path() /= fs::path("fmi4cpp_" + fmuName + "_" + generate_simple_id(8)));
+
+    if (!fs::create_directories(tmpPath)) {
+        const auto err = "Failed to create temporary directory '" + tmpPath.string() + "' !";
+        MLOG_FATAL(err);
+        throw std::runtime_error(err);
+    }
+
+    MLOG_DEBUG("Created temporary directory '" << tmpPath.string());
+
+    if (!unzip(fmu_path, tmpPath.string())) {
+        const auto err = "Failed to extract FMU '" + fs::absolute(fs::path(fmu_path)).string() + "'!";
+        MLOG_FATAL(err);
+        throw std::runtime_error(err);
+    }
+    auto fmu = fmi2::fmu(tmpPath,false).as_cs_fmu();
+
+    size_t numOutputs = 0;
+    for (const auto& v : *fmu->get_model_description()->model_variables) {
+        if (v.causality == fmi2::causality::output) {
+            numOutputs++;
+        }
+    }
+    CHECK(2 == numOutputs);
+
+    auto slave = fmu->new_instance();
+    CHECK(slave->setup_experiment());
+    CHECK(slave->enter_initialization_mode());
+    CHECK(slave->exit_initialization_mode());
+
+    double ref;
+    CHECK(slave->step(step_size));
+    CHECK(slave->read_real(vr, ref));
+
+    CHECK(298.15 == Approx(ref));
+
     CHECK(slave->terminate());
 }
\ No newline at end of file