diff --git a/rangement/finders.mjs b/rangement/finders.mjs
index f03dc17b..46ec0d4a 100644
--- a/rangement/finders.mjs
+++ b/rangement/finders.mjs
@@ -1,8 +1,11 @@
 /**
  * la classe qui repère des patterns
  */
-import {tagSectionSeparator} from "./configs";
+import {tagSectionSeparator} from "./configs.mjs";
 
+/**
+ * finds patterns for file name
+ */
 export default class finders{
 
 
diff --git a/rangement/index.mjs b/rangement/index.mjs
index 7132a88b..a905329a 100644
--- a/rangement/index.mjs
+++ b/rangement/index.mjs
@@ -6,7 +6,7 @@ import finders from './finders.mjs'
 // })
 import exifr from 'exifr'
 import moment from 'moment'
-import {tagSectionSeparator, tagSeparator} from "./configs";
+import {tagSectionSeparator, tagSeparator} from "./configs.mjs";
 
 const pathFolder = '/home/poule/encrypted/stockage-syncable/photos/a_dispatcher/tout'
 const sortingFolder  = '/home/poule/encrypted/stockage-syncable/photos/a_dispatcher'
@@ -148,7 +148,7 @@ if (fileMixedNewName !== originalFileName) {
 function addTagInFileName(tagName, fileName) {
 
     let tags = findTagSectionInString(fileName)
-    let firstPart = findFileNameFreeTextPart(fileName)
+    let firstPart = finders.findFileNameFreeTextPart(fileName)
 
     tags.push(tagName)
     let uniqueArray = [...new Set(tags)]
@@ -168,7 +168,7 @@ const fileDefinition = {
 function destructurateFileName(fileName) {
     return {
         dateStamp: finders.findFormattedDate(fileName),
-        freeText: findFileNameFreeTextPart(fileName),
+        freeText: finders.findFileNameFreeTextPart(fileName),
         tags: findTagSectionInString(fileName),
         extension: finders.findFileExtension(fileName),
     }
diff --git a/rangement/index.test.js b/rangement/main.test.js
similarity index 63%
rename from rangement/index.test.js
rename to rangement/main.test.js
index be85fbfd..f4ef9939 100644
--- a/rangement/index.test.js
+++ b/rangement/main.test.js
@@ -1,11 +1,14 @@
-// import finders from "./finders.mjs";
-const finders = require('./finders.mjs')
+import finders from "./finders.mjs";
+// const finders = require('./finders.mjs')
 
 describe('rangement file name', () => {
 
     test('detects date in file name', () => {
         expect(finders.findFormattedDate('2023-06-23T18.36.47 -- machin bidule.jpg')).toBe('2023-06-23T18.36.47');
     });
+    test('detects file extension in file name', () => {
+        expect(finders.findFileExtension()('2023-06-23T18.36.47 -- machin bidule.jpg')).toBe('jpg');
+    });
 })
 console.log('finders', finders)