Added some more Unit Test to verify equality between DTOs.

src/test/java/de/nclazz/service/mailrelay/adapter/web/MessageFormTest.java

@@ -0,0 +1,36 @@
+package de.nclazz.service.mailrelay.adapter.web;
+
+import de.nclazz.service.mailrelay.domain.Message;
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDateTime;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MessageFormTest {
+
+    @Test
+    void messageFormsWithSamePropertiesMustBeEqual() {
+        MessageForm formA = MessageForm.of("my-token", "Subject", "My Content", "from@mymail.com");
+        MessageForm formB = MessageForm.of("my-token", "Subject", "My Content", "from@mymail.com");
+
+        assertThat(formA.equals(formB)).isTrue();
+    }
+
+    @Test
+    void messageFormsWithDifferentPropertiesMustBeNotEqual() {
+        MessageForm formA = MessageForm.of("my-token", "Subject", "My Content", "from@mymail.com");
+        MessageForm formB = MessageForm.of("other-token", "Subject", "My Content", "from@mymail.com");
+
+        assertThat(formA.equals(formB)).isFalse();
+    }
+
+    @Test
+    void messageFormCorrectlyMapsToMessage() {
+        LocalDateTime now = LocalDateTime.now();
+        MessageForm form = MessageForm.of("my-token", "Subject", "My Content", "from@mymail.com");
+
+        assertThat(form.toMessage(now))
+                .isEqualTo(Message.of("Subject", "My Content", "from@mymail.com", now));
+    }
+}

src/test/java/de/nclazz/service/mailrelay/adapter/web/ValidationErrorTest.java

@@ -0,0 +1,24 @@
+package de.nclazz.service.mailrelay.adapter.web;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class ValidationErrorTest {
+
+    @Test
+    void validationErrorWithSamePropertiesMustBeEqual() {
+        ValidationError errorA = new ValidationError("field", "The message", null, "NotBlank");
+        ValidationError errorB = new ValidationError("field", "The message", null, "NotBlank");
+
+        assertThat(errorA.equals(errorB)).isTrue();
+    }
+
+    @Test
+    void validationErrorWithDifferentPropertiesMustBeNotEqual() {
+        ValidationError errorA = new ValidationError("field", "The message", null, "NotBlank");
+        ValidationError errorB = new ValidationError("fieldB", "The message", null, "NotBlank");
+
+        assertThat(errorA.equals(errorB)).isFalse();
+    }
+}

src/test/java/de/nclazz/service/mailrelay/domain/AccountTest.java

@@ -0,0 +1,28 @@
+package de.nclazz.service.mailrelay.domain;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class AccountTest {
+
+    @Test
+    void accountWithSamePropertiesMustBeEqual() {
+        Account accountA = Account.of("my-account", List.of("vip@my-account.com"));
+        Account accountB = Account.of("my-account", List.of("vip@my-account.com"));
+
+        assertThat(accountA.equals(accountB)).isTrue();
+    }
+
+    @Test
+    void accountWithoutSamePropertiesMustBeNotEqual() {
+        Account accountA = Account.of("my-account", List.of("vip@my-account.com"));
+        accountA.setGuid(UUID.randomUUID());
+        Account accountB = Account.of("my-account", List.of("vip@my-account.com"));
+
+        assertThat(accountA.equals(accountB)).isFalse();
+    }
+}

src/test/java/de/nclazz/service/mailrelay/domain/MessageTest.java

@@ -0,0 +1,28 @@
+package de.nclazz.service.mailrelay.domain;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.LocalDateTime;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MessageTest {
+
+    @Test
+    void messagesWithSamePropertiesMustBeEqual() {
+        LocalDateTime now = LocalDateTime.now();
+        Message messageA = Message.of("Subject", "Content", "from@mycompany.com", now);
+        Message messageB = Message.of("Subject", "Content", "from@mycompany.com", now);
+
+        assertThat(messageA.equals(messageB)).isTrue();
+    }
+
+    @Test
+    void messagesWithoutSamePropertiesMustBeNotEqual() {
+        LocalDateTime now = LocalDateTime.now();
+        Message messageA = Message.of("Subject", "Content", "from@mycompany.com", now);
+        Message messageB = Message.of("Other Subject", "Content", "from@mycompany.com", now);
+
+        assertThat(messageA.equals(messageB)).isFalse();
+    }
+}