add tests

__tests__/helpers/sanitizeName.spec.js

+const { sanitizeLastname } = require('../../src/helpers/sanitizeName')
+
+describe('sanitizeLastname', () => {
+  it('should return sanitized name', async () => {
+    expect(sanitizeLastname('âêîôûäàëïöüéèç')).toEqual('aeiouaaeioueec')
+  })
+})

src/helpers/sanitizeName.js

@@ -5,6 +5,7 @@ const REPLACE_CHARS = {
   ô: 'o',
   û: 'u',
   ä: 'a',
+  à: 'a',
   ë: 'e',
   ï: 'i',
   ö: 'o',
@@ -21,7 +22,7 @@ const REPLACE_CHARS = {
  */
 function sanitizeLastname(lastname) {
   return lastname
-    .replace(/[âêîôûäëïüéèç]/g, match => REPLACE_CHARS[match])
+    .replace(/[âêîôûäàëïöüéèç]/g, match => REPLACE_CHARS[match])
     .trim()
 }