diff --git a/src/solver/modeler/loadFiles/include/antares/solver/modeler/loadFiles/loadFiles.h b/src/solver/modeler/loadFiles/include/antares/solver/modeler/loadFiles/loadFiles.h
index 61c417f585..63ab4bb732 100644
--- a/src/solver/modeler/loadFiles/include/antares/solver/modeler/loadFiles/loadFiles.h
+++ b/src/solver/modeler/loadFiles/include/antares/solver/modeler/loadFiles/loadFiles.h
@@ -22,6 +22,7 @@
 #pragma once
 
 #include <filesystem>
+#include <vector>
 
 #include <antares/study/system-model/library.h>
 #include <antares/study/system-model/system.h>
@@ -32,4 +33,6 @@ namespace Antares::Solver::LoadFiles
 Study::SystemModel::System loadSystem(const std::filesystem::path& studyPath,
                                       const std::vector<Study::SystemModel::Library>& libraries);
 
+std::vector<Study::SystemModel::Library> loadLibraries(const std::filesystem::path& studyPath);
+
 } // namespace Antares::Solver::LoadFiles
diff --git a/src/solver/modeler/loadFiles/readLibraries.cpp b/src/solver/modeler/loadFiles/readLibraries.cpp
index d71615f080..33fefacc23 100644
--- a/src/solver/modeler/loadFiles/readLibraries.cpp
+++ b/src/solver/modeler/loadFiles/readLibraries.cpp
@@ -46,7 +46,7 @@ std::vector<Study::SystemModel::Library> loadLibraries(const fs::path& studyPath
     const fs::path directoryPath = studyPath / "input" / "model-libraries";
     for (const auto& entry: fs::directory_iterator(directoryPath))
     {
-        if (entry.path().extension() != "yml")
+        if (entry.path().extension() != ".yml")
         {
             logs.info() << "File ignored because of wrong extension: " << entry.path();
             continue;
diff --git a/src/tests/src/solver/modeler/loadFiles/testLoadModelerFiles.cpp b/src/tests/src/solver/modeler/loadFiles/testLoadModelerFiles.cpp
index 8512eeba33..d3fe9c4c82 100644
--- a/src/tests/src/solver/modeler/loadFiles/testLoadModelerFiles.cpp
+++ b/src/tests/src/solver/modeler/loadFiles/testLoadModelerFiles.cpp
@@ -31,24 +31,41 @@
 
 BOOST_AUTO_TEST_SUITE(read_modeler_parameters)
 
-BOOST_AUTO_TEST_CASE(all_properties_set)
+namespace fs = std::filesystem;
+
+struct FixtureLoadFile
+{
+    fs::path studyPath;
+    fs::path inputPath;
+    fs::path libraryDirPath;
+
+    FixtureLoadFile()
+    {
+        studyPath = CREATE_TMP_DIR_BASED_ON_TEST_NAME();
+        inputPath = createFolder(studyPath, "input");
+        libraryDirPath = createFolder(inputPath, "model-libraries");
+    }
+
+    ~FixtureLoadFile()
+    {
+        fs::remove_all(studyPath);
+    }
+};
+
+BOOST_FIXTURE_TEST_CASE(read_one_lib_file, FixtureLoadFile)
 {
-    /* const auto working_tmp_dir = CREATE_TMP_DIR_BASED_ON_TEST_NAME(); */
-    /* const auto fileP = working_tmp_dir / "parameters.yaml"; */
-    /* { */
-    /*     std::ofstream param(fileP); */
-    /*     param << R"( */
-    /* solver: sirius */
-    /* solver-logs: false */
-    /* solver-parameters: PRESOLVE 1 */
-    /* no-output: true)"; */
-    /* } */
-
-    /* auto params = Antares::Solver::parseModelerParameters(fileP); */
-    /* BOOST_CHECK_EQUAL(params.solver, "sirius"); */
-    /* BOOST_CHECK_EQUAL(params.solverLogs, false); */
-    /* BOOST_CHECK_EQUAL(params.solverParameters, "PRESOLVE 1"); */
-    /* BOOST_CHECK_EQUAL(params.noOutput, true); */
+    std::ofstream libStream(libraryDirPath / "simple.yml");
+    libStream << R"(
+        library:
+            id: lib_id
+            description: lib_description
+            port-types: []
+            models: []
+    )";
+    libStream.close();
+
+    auto libraries = Antares::Solver::LoadFiles::loadLibraries(studyPath);
+    /* BOOST_CHECK_EQUAL(libraries[0].Id(), "lib_id"); */
 }
 
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/tests/src/utils/files-system.cpp b/src/tests/src/utils/files-system.cpp
index f6097ee82b..e8d6163ea7 100644
--- a/src/tests/src/utils/files-system.cpp
+++ b/src/tests/src/utils/files-system.cpp
@@ -10,7 +10,7 @@ fs::path generateAndCreateDirName(const std::string& dirName)
     return working_dir;
 }
 
-void createFolder(const std::string& path, const std::string& folder_name)
+fs::path createFolder(const std::string& path, const std::string& folder_name)
 {
     fs::path folder_path = fs::path(path.c_str()) / folder_name.c_str();
 
@@ -22,6 +22,8 @@ void createFolder(const std::string& path, const std::string& folder_name)
     {
         std::cerr << "Exception creating folder '" + folder_name + "': " + e.what() + "\n";
     }
+
+    return folder_path;
 }
 
 void createFile(const std::string& folder_path, const std::string& file_name)
diff --git a/src/tests/src/utils/files-system.h b/src/tests/src/utils/files-system.h
index 092b498350..9ad4503e54 100644
--- a/src/tests/src/utils/files-system.h
+++ b/src/tests/src/utils/files-system.h
@@ -31,6 +31,6 @@
 
 std::filesystem::path generateAndCreateDirName(const std::string&);
 
-void createFolder(const std::string& path, const std::string& folder_name);
+std::filesystem::path createFolder(const std::string& path, const std::string& folder_name);
 void createFile(const std::string& folder_path, const std::string& file_name);
 void removeFolder(std::string& path, std::string& folder_name);