diff --git a/tests/unit/plugins/database/HasOneModelTest.php b/tests/unit/plugins/database/HasOneModelTest.php
index 02251902b..7a5e30157 100644
--- a/tests/unit/plugins/database/HasOneModelTest.php
+++ b/tests/unit/plugins/database/HasOneModelTest.php
@@ -30,6 +30,10 @@ class HasOneModelTest extends PluginTestCase
         $this->assertEquals($author->id, $phone1->author_id);
         $this->assertEquals('0404040404', $author->phone->number);
 
+        // Double check
+        $phone1 = Phone::find($phone1->id);
+        $this->assertEquals($author->id, $phone1->author_id);
+
         // Set by primary key
         $phoneId = $phone2->id;
         $author->phone = $phoneId;
@@ -38,6 +42,10 @@ class HasOneModelTest extends PluginTestCase
         $this->assertEquals($author->id, $phone2->author_id);
         $this->assertEquals('0505050505', $author->phone->number);
 
+        // Ensure relationship is "stolen" from first model
+        $phone1 = Phone::find($phone1->id);
+        $this->assertNotEquals($author->id, $phone1->author_id);
+
         // Nullify
         $author->phone = null;
         $author->save();
@@ -51,6 +59,25 @@ class HasOneModelTest extends PluginTestCase
         $this->assertEquals($author->id, $phone3->author_id);
     }
 
+    public function testSetRelationValueTwice()
+    {
+        Model::unguard();
+        $author = Author::create(['name' => 'Stevie', 'email' => 'stevie@email.tld']);
+        $phone = Phone::create(['number' => '0505050505']);
+        Model::reguard();
+
+        $phoneId = $phone->id;
+        $author->phone = $phoneId;
+        $author->save();
+
+        $author->phone = $phoneId;
+        $author->save();
+
+        $phone = Phone::find($phoneId);
+        $this->assertEquals($author->id, $phone->author_id);
+        $this->assertEquals('0505050505', $author->phone->number);
+    }
+
     public function testGetRelationValue()
     {
         Model::unguard();
diff --git a/tests/unit/plugins/database/MorphOneModelTest.php b/tests/unit/plugins/database/MorphOneModelTest.php
index d8cb43ca3..4051e0b0c 100644
--- a/tests/unit/plugins/database/MorphOneModelTest.php
+++ b/tests/unit/plugins/database/MorphOneModelTest.php
@@ -59,6 +59,11 @@ class MorphOneModelTest extends PluginTestCase
         $this->assertEquals(get_class($post), $meta1->taggable_type);
         $this->assertEquals('Question', $post->meta->meta_title);
 
+        // Double check
+        $meta1 = Meta::find($meta1->id);
+        $this->assertEquals($post->id, $meta1->taggable_id);
+        $this->assertEquals(get_class($post), $meta1->taggable_type);
+
         // Set by primary key
         $metaId = $meta2->id;
         $author->meta = $metaId;
@@ -82,6 +87,33 @@ class MorphOneModelTest extends PluginTestCase
         $this->assertEquals($author->id, $meta3->taggable_id);
     }
 
+    public function testSetRelationValueTwice()
+    {
+        Model::unguard();
+        $author = Author::create(['name' => 'Stevie', 'email' => 'stevie@email.tld']);
+        $meta = Meta::create([
+            'meta_title' => 'Question',
+            'meta_description' => 'Industry',
+            'meta_keywords' => 'major',
+            'canonical_url' => 'http://google.com/search/jobs',
+            'redirect_url' => 'http://google.com',
+            'robot_index' => 'index',
+            'robot_follow' => 'follow',
+        ]);
+        Model::reguard();
+
+        $metaId = $meta->id;
+        $author->meta = $metaId;
+        $author->save();
+
+        $author->meta = $metaId;
+        $author->save();
+
+        $meta = Meta::find($metaId);
+        $this->assertEquals($author->id, $meta->taggable_id);
+        $this->assertEquals(get_class($author), $meta->taggable_type);
+    }
+
     public function testGetRelationValue()
     {
         Model::unguard();