diff --git a/tests/unit/framework/run_unit_tests.py b/tests/unit/framework/run_unit_tests.py
index d72269c..a0a477f 100755
--- a/tests/unit/framework/run_unit_tests.py
+++ b/tests/unit/framework/run_unit_tests.py
@@ -19,10 +19,46 @@ def run_command(args):
     return result
 
 
+def rmv_cmd(trgt):
+    """Remove target with force"""
+    result = run_command(["rm", "-rf", trgt])
+    if result.returncode != 0:
+        raise Exception("Removing {} before testing failed!".
+                        format(os.path.dirname(os.path.realpath(__file__))
+                               + trgt))
+
+
+def cleanup():
+    """Delete files created by unit tests"""
+    script_path = os.path.dirname(os.path.realpath(__file__))
+    test_dir = os.path.join(script_path, tests_config.MAIN_DIRECTORY_OF_UNIT_TESTS)
+    result = run_command(["cd", test_dir])
+    if result.returncode != 0:
+        raise Exception("Cleanup before testing failed!")
+
+    # r=root, d=directories, f = files
+    for r, d, f in os.walk(test_dir):
+        for file in f:
+            if '_generated_wrap' in file:
+                rmv_cmd(file)
+
+    rmv_cmd("preprocessed_sources_repository")
+    rmv_cmd("sources_to_test_repository")
+    rmv_cmd("build")
+
+    result = run_command(["cd", script_path])
+    if result.returncode != 0:
+        raise Exception("Cleanup before testing failed!")
+
+
+cleanup()
+
 script_path = os.path.dirname(os.path.realpath(__file__))
 
 main_UT_dir = os.path.join(script_path, tests_config.MAIN_DIRECTORY_OF_UNIT_TESTS)
 
+main_env_dir = os.path.join(script_path, tests_config.MAIN_DIRECTORY_OF_ENV_FILES)
+
 main_tested_dir = os.path.join(script_path, tests_config.MAIN_DIRECTORY_OF_TESTED_PROJECT)
 
 if not os.path.isdir(os.path.join(main_UT_dir, "ocf_env", "ocf")):
@@ -31,6 +67,12 @@ if not os.path.isdir(os.path.join(main_UT_dir, "ocf_env", "ocf")):
     except Exception:
         raise Exception("Cannot create ocf_env/ocf directory!")
 
+result = run_command(["ln", "-fs",
+                      os.path.join(main_env_dir, "*"),
+                      os.path.join(main_UT_dir, "ocf_env")])
+if result.returncode != 0:
+    raise Exception("Preparing env sources for testing failed!")
+
 result = run_command(["cp", "-r",
                       os.path.join(main_tested_dir, "inc", "*"),
                       os.path.join(main_UT_dir, "ocf_env", "ocf")])
diff --git a/tests/unit/framework/tests_config.py b/tests/unit/framework/tests_config.py
index 654b3cb..52c0028 100644
--- a/tests/unit/framework/tests_config.py
+++ b/tests/unit/framework/tests_config.py
@@ -9,6 +9,8 @@
 
 MAIN_DIRECTORY_OF_TESTED_PROJECT = "../../../"
 
+MAIN_DIRECTORY_OF_ENV_FILES = MAIN_DIRECTORY_OF_TESTED_PROJECT + "env/posix/"
+
 MAIN_DIRECTORY_OF_UNIT_TESTS = "../tests/"
 
 # Paths to all directories, in which tests are stored. All paths should be relative to