diff --git a/tests/unit/Domain/Package/PackageTest.php b/tests/unit/Domain/Package/PackageTest.php
index 1328cc46..ca87c9fa 100644
--- a/tests/unit/Domain/Package/PackageTest.php
+++ b/tests/unit/Domain/Package/PackageTest.php
@@ -8,16 +8,19 @@
 use PHPUnit\Framework\TestCase;
 
 final class PackageTest extends TestCase {
+  private array $packageAttributes;
   private Package $package;
   private DateTimeImmutable $createdAt;
 
   public function setUp(): void {
-    $this->package = new Package(
-      name:           'vendor/project',
-      description:    'An awesome package description',
-      latestVersion:  '1.0',
-      url:            'http://'
-    );
+    $this->packageAttributes = [
+      'name'          => 'vendor/project',
+      'description'   => 'An awesome package description',
+      'latestVersion' => '1.0',
+      'url'           => 'http://'
+    ];
+
+    $this->package = new Package(...$this->packageAttributes);
 
     $this->createdAt = $this->package->getCreatedAt();
   }
@@ -51,11 +54,24 @@ public function testDescriptionHasBeenUpdated(): void {
     $this->assertInstanceOf(DateTimeImmutable::class, $this->package->getUpdatedAt());
   }
 
+  public function testDescriptionDoesNotUpdateWhenItsTheSame(): void {
+    $this->assertInstanceOf(DateTimeImmutable::class, $this->package->getCreatedAt());
+    $this->assertFalse($this->package->isDirty());
+    $this->assertNull($this->package->getUpdatedAt());
+
+    $this->package = $this->package->withDescription('An awesome package description');
+
+    $this->assertFalse($this->package->isDirty());
+    $this->assertSame('An awesome package description', $this->package->getDescription());
+    $this->assertSame($this->createdAt, $this->package->getCreatedAt());
+    $this->assertNull($this->package->getUpdatedAt());
+  }
+
   public function testLatestVersion(): void {
     $this->assertSame('1.0', $this->package->getLatestVersion());
   }
 
-  public function testLatestversionHasBeenUpdated(): void {
+  public function testLatestVersionHasBeenUpdated(): void {
     $this->assertInstanceOf(DateTimeImmutable::class, $this->package->getCreatedAt());
     $this->assertFalse($this->package->isDirty());
     $this->assertNull($this->package->getUpdatedAt());
@@ -68,6 +84,19 @@ public function testLatestversionHasBeenUpdated(): void {
     $this->assertInstanceOf(DateTimeImmutable::class, $this->package->getUpdatedAt());
   }
 
+  public function testLatestVersionDoesNotUpdateWhenItsTheSame(): void {
+    $this->assertInstanceOf(DateTimeImmutable::class, $this->package->getCreatedAt());
+    $this->assertFalse($this->package->isDirty());
+    $this->assertNull($this->package->getUpdatedAt());
+
+    $this->package = $this->package->withLatestVersion('1.0');
+
+    $this->assertFalse($this->package->isDirty());
+    $this->assertSame('1.0', $this->package->getLatestVersion());
+    $this->assertSame($this->createdAt, $this->package->getCreatedAt());
+    $this->assertNull($this->package->getUpdatedAt());
+  }
+
   public function testUrl(): void {
     $this->assertSame('http://', $this->package->getUrl());
   }
@@ -84,4 +113,46 @@ public function testUrlHasBeenUpdated(): void {
     $this->assertSame($this->createdAt, $this->package->getCreatedAt());
     $this->assertInstanceOf(DateTimeImmutable::class, $this->package->getUpdatedAt());
   }
+
+  public function testUrlDoesNotUpdateWhenItsTheSame(): void {
+    $this->assertInstanceOf(DateTimeImmutable::class, $this->package->getCreatedAt());
+    $this->assertFalse($this->package->isDirty());
+    $this->assertNull($this->package->getUpdatedAt());
+
+    $this->package = $this->package->withUrl('http://');
+
+    $this->assertFalse($this->package->isDirty());
+    $this->assertSame('http://', $this->package->getUrl());
+    $this->assertSame($this->createdAt, $this->package->getCreatedAt());
+    $this->assertNull($this->package->getUpdatedAt());
+  }
+
+  public function testJsonSerializeWhenPackageWasNotUpdated() {
+    $packageWasNotUpdated = array_merge(
+      $this->packageAttributes,
+      [
+        'createdAt' => $this->createdAt,
+        'updatedAt' => null
+      ]
+    );
+
+    $this->assertIsArray($this->package->jsonSerialize());
+    $this->assertSame($packageWasNotUpdated, $this->package->jsonSerialize());
+  }
+
+  public function testJsonSerializeWhenPackageWasUpdated(): void {
+    $this->package = $this->package->withLatestVersion('1.0.1');
+
+    $packageWasUpdated = array_merge(
+      $this->packageAttributes,
+      [
+        'latestVersion' => '1.0.1',
+        'createdAt' => $this->createdAt,
+        'updatedAt' => $this->package->getUpdatedAt()
+      ]
+    );
+
+    $this->assertIsArray($this->package->jsonSerialize());
+    $this->assertSame($packageWasUpdated, $this->package->jsonSerialize());
+  }
 }