fix: Fixed user persistence after exchange

src/test/java/eu/ztsh/wymiana/util/UserMapperTest.java

@@ -25,6 +25,20 @@ class UserMapperTest {
                 .isEqualTo(expected);
     }
 
+    @Test
+    void pojoToEntityTest() {
+        var entity = new User(
+                EntityCreator.Constants.NAME,
+                EntityCreator.Constants.SURNAME,
+                EntityCreator.Constants.PESEL,
+                Map.of("PLN", new Currency("PLN", EntityCreator.Constants.PLN))
+        );
+        var expected = EntityCreator.user().build();
+        assertThat(UserMapper.pojoToEntity(entity))
+                .usingRecursiveComparison()
+                .isEqualTo(expected);
+    }
+
     @Test
     void requestToEntityTest() {
         var request = EntityCreator.userRequest().build();