From 932962e463cc0e31e9bac9604ebcedff749a50bc Mon Sep 17 00:00:00 2001
From: mo7ty <mo7ty@users.noreply.github.com>
Date: Tue, 15 Apr 2025 22:11:42 +0100
Subject: [PATCH 1/2] Add [+UserDeserializationTest+]

---
 src/test/java/UserDeserializationTest.java | 64 ++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 src/test/java/UserDeserializationTest.java

diff --git a/src/test/java/UserDeserializationTest.java b/src/test/java/UserDeserializationTest.java
new file mode 100644
index 0000000..0b8b1c6
--- /dev/null
+++ b/src/test/java/UserDeserializationTest.java
@@ -0,0 +1,64 @@
+import com.fasterxml.jackson.annotation.JsonAlias;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import static java.util.Objects.hash;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class UserDeserializationTest {
+
+    public static class User {
+        private String username;
+        private int age;
+
+        public String getUsername() {
+            return username;
+        }
+
+        public void setUsername(String username) {
+            this.username = username;
+        }
+
+        public int getAge() {
+            return age;
+        }
+
+        public void setAge(int age) {
+            this.age = age;
+        }
+
+        @Override
+        public boolean equals(final Object o) {
+            return this == o
+                || (o instanceof User
+                 && hashCode() == o.hashCode());
+        }
+
+        @Override
+        public int hashCode() {
+            return hash(getUsername(),
+                        getAge());
+        }
+    }
+
+    abstract static class UserMixin {
+        public static final String USER_NAME = "user_name";
+        @JsonProperty
+        @JsonAlias(USER_NAME)
+        abstract void setUsername(String username);
+    }
+
+    @Test
+    public void testUserDeserializationWithSingleObjectMapper() throws Exception {
+        String json = "{\"username\": \"Bob\", \"age\": 25}";
+
+        ObjectMapper mapper = new ObjectMapper();
+        mapper.addMixIn(User.class, UserMixin.class);
+
+        User user1 = mapper.readValue(json, User.class);
+        User user2 = mapper.readValue(json.replace("username", UserMixin.USER_NAME), User.class);
+
+        assertEquals(user1, user2);
+    }
+}

From 33a93cfb09c938be796dbf973c36bbcbc2661d44 Mon Sep 17 00:00:00 2001
From: mo7ty <no-reply@mail.com>
Date: Wed, 16 Apr 2025 09:16:32 +0100
Subject: [PATCH 2/2] Improve
 `UserDeserializationTest#testUserDeserializationWithSingleObjectMapper()`

---
 src/test/java/UserDeserializationTest.java | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/test/java/UserDeserializationTest.java b/src/test/java/UserDeserializationTest.java
index 0b8b1c6..abe541b 100644
--- a/src/test/java/UserDeserializationTest.java
+++ b/src/test/java/UserDeserializationTest.java
@@ -4,7 +4,9 @@
 import org.junit.jupiter.api.Test;
 
 import static java.util.Objects.hash;
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
 
 public class UserDeserializationTest {
 
@@ -51,14 +53,20 @@ abstract static class UserMixin {
 
     @Test
     public void testUserDeserializationWithSingleObjectMapper() throws Exception {
-        String json = "{\"username\": \"Bob\", \"age\": 25}";
 
         ObjectMapper mapper = new ObjectMapper();
         mapper.addMixIn(User.class, UserMixin.class);
 
-        User user1 = mapper.readValue(json, User.class);
-        User user2 = mapper.readValue(json.replace("username", UserMixin.USER_NAME), User.class);
+        String json1 = "{\"username\": \"Bob\", \"age\": 25}";
+        assertThat(json1).doesNotContain(UserMixin.USER_NAME);
 
+        String json2 = json1.replace("username", UserMixin.USER_NAME);
+        assertThat(json2).contains(UserMixin.USER_NAME);
+
+        assertNotEquals(json1, json2);
+
+        User user1 = mapper.readValue(json1, User.class);
+        User user2 = mapper.readValue(json2, User.class);
         assertEquals(user1, user2);
     }
 }