diff --git a/src/rougail/user_data_yaml/__init__.py b/src/rougail/user_data_yaml/__init__.py
index ed5ff47..a25ff1e 100644
--- a/src/rougail/user_data_yaml/__init__.py
+++ b/src/rougail/user_data_yaml/__init__.py
@@ -54,7 +54,7 @@ class RougailUserDataYaml:
     def run(
         self,
     ) -> None:
-        self.yaml = YAML()
+        self.yaml = YAML(typ='safe', pure=True)
         user_datas = []
         for idx, filename in enumerate(self.filenames):
             filename = Path(filename)
diff --git a/tests/directory/result.txt b/tests/directory/result.txt
new file mode 100644
index 0000000..76d03a9
--- /dev/null
+++ b/tests/directory/result.txt
@@ -0,0 +1,5 @@
+{
+    "variable1": "value1",
+    "variable2": "value2",
+    "variable3": null
+}
\ No newline at end of file
diff --git a/tests/directory/structure/rougail/file.yaml b/tests/directory/structure/rougail/file.yaml
new file mode 100644
index 0000000..41ab39a
--- /dev/null
+++ b/tests/directory/structure/rougail/file.yaml
@@ -0,0 +1,11 @@
+---
+version: 1.1
+
+variable1:
+  mandatory: false
+
+variable2:
+  mandatory: false
+
+variable3:
+  mandatory: false
diff --git a/tests/directory/yaml/file1.txt b/tests/directory/yaml/file1.txt
new file mode 100644
index 0000000..59e9f17
--- /dev/null
+++ b/tests/directory/yaml/file1.txt
@@ -0,0 +1,2 @@
+---
+variable3: value3
diff --git a/tests/directory/yaml/file1.yaml b/tests/directory/yaml/file1.yaml
new file mode 100644
index 0000000..2d6024c
--- /dev/null
+++ b/tests/directory/yaml/file1.yaml
@@ -0,0 +1,2 @@
+---
+variable2: value2
diff --git a/tests/directory/yaml/file1.yml b/tests/directory/yaml/file1.yml
new file mode 100644
index 0000000..6f1798d
--- /dev/null
+++ b/tests/directory/yaml/file1.yml
@@ -0,0 +1,2 @@
+---
+variable1: value1
diff --git a/tests/results/00_2default_calculated_variable_description_multi_line/errors/all.json b/tests/results/00_2default_calculated_variable_description_multi_line/errors/all.json
new file mode 100644
index 0000000..217db0a
--- /dev/null
+++ b/tests/results/00_2default_calculated_variable_description_multi_line/errors/all.json
@@ -0,0 +1,4 @@
+{
+    "errors": [],
+    "warnings": []
+}
\ No newline at end of file
diff --git a/tests/results/00_2default_calculated_variable_description_multi_line/errors/mandatories.json b/tests/results/00_2default_calculated_variable_description_multi_line/errors/mandatories.json
new file mode 100644
index 0000000..217db0a
--- /dev/null
+++ b/tests/results/00_2default_calculated_variable_description_multi_line/errors/mandatories.json
@@ -0,0 +1,4 @@
+{
+    "errors": [],
+    "warnings": []
+}
\ No newline at end of file
diff --git a/tests/results/00_2default_calculated_variable_description_multi_line/file/all.yml b/tests/results/00_2default_calculated_variable_description_multi_line/file/all.yml
new file mode 100644
index 0000000..cc33587
--- /dev/null
+++ b/tests/results/00_2default_calculated_variable_description_multi_line/file/all.yml
@@ -0,0 +1,7 @@
+{
+    "rougail": {
+        "var1": "string1",
+        "var2": "string1",
+        "var3": "string1"
+    }
+}
\ No newline at end of file
diff --git a/tests/results/00_2default_calculated_variable_description_multi_line/file/all_exclude.yml b/tests/results/00_2default_calculated_variable_description_multi_line/file/all_exclude.yml
new file mode 100644
index 0000000..cc33587
--- /dev/null
+++ b/tests/results/00_2default_calculated_variable_description_multi_line/file/all_exclude.yml
@@ -0,0 +1,7 @@
+{
+    "rougail": {
+        "var1": "string1",
+        "var2": "string1",
+        "var3": "string1"
+    }
+}
\ No newline at end of file
diff --git a/tests/results/00_2default_calculated_variable_description_multi_line/file/mandatories.yml b/tests/results/00_2default_calculated_variable_description_multi_line/file/mandatories.yml
new file mode 100644
index 0000000..1f0827e
--- /dev/null
+++ b/tests/results/00_2default_calculated_variable_description_multi_line/file/mandatories.yml
@@ -0,0 +1,6 @@
+{
+    "rougail": {
+        "var1": "string1",
+        "var3": "string1"
+    }
+}
\ No newline at end of file
diff --git a/tests/results/00_2default_calculated_variable_description_multi_line/makedict/all.json b/tests/results/00_2default_calculated_variable_description_multi_line/makedict/all.json
new file mode 100644
index 0000000..2fbf52f
--- /dev/null
+++ b/tests/results/00_2default_calculated_variable_description_multi_line/makedict/all.json
@@ -0,0 +1,5 @@
+{
+    "rougail.var1": "string1",
+    "rougail.var2": "string1",
+    "rougail.var3": "string1"
+}
diff --git a/tests/results/00_2default_calculated_variable_description_multi_line/makedict/mandatories.json b/tests/results/00_2default_calculated_variable_description_multi_line/makedict/mandatories.json
new file mode 100644
index 0000000..2fbf52f
--- /dev/null
+++ b/tests/results/00_2default_calculated_variable_description_multi_line/makedict/mandatories.json
@@ -0,0 +1,5 @@
+{
+    "rougail.var1": "string1",
+    "rougail.var2": "string1",
+    "rougail.var3": "string1"
+}