Added update validation for name in Blog and added test for it

app/Http/Requests/Backend/BlogTags/UpdateBlogTagsRequest.php

@@ -39,6 +39,7 @@ class UpdateBlogTagsRequest extends Request
     public function messages()
     {
         return [
+            'name.unique'   => 'Blog Tag name already exists, please enter a different name.',
             'name.required' => 'Blog Tag name is a required field.',
             'name.max'      => 'Blog Tag may not be greater than 191 characters.',
         ];

app/Http/Requests/Backend/Blogs/UpdateBlogsRequest.php

@@ -27,7 +27,7 @@ class UpdateBlogsRequest extends Request
     public function rules()
     {
         return [
-            'name'       => 'required|max:191',
+            'name'       => 'required|max:191|unique:blogs,name,' . $this->segment(3),
             'content'    => 'required',
             'categories' => 'required',
             'tags'       => 'required',
@@ -42,6 +42,7 @@ class UpdateBlogsRequest extends Request
     public function messages()
     {
         return [
+            'name.unique'   => 'Blog name already exists, please enter a different name.',
             'name.required' => 'Please insert Blog Title',
             'name.max'      => 'Blog Title may not be greater than 191 characters.',
         ];

tests/Feature/Backend/ManageBlogsTest.php

@@ -196,4 +196,17 @@ class ManageBlogsTest extends TestCase
 
         $this->assertDatabaseMissing(config('module.blogs.table'), ['id' => $this->blog->id, 'deleted_at' => null]);
     }
+
+    /** @test */
+    public function a_user_can_not_update_a_blog_with_same_name()
+    {
+        $this->actingAs($this->admin)->withExceptionHandling();
+
+        $catCategory = create(Blog::class, ['name' => 'Cat']);
+        $dogCategory = create(Blog::class, ['name' => 'Dog']);
+
+        $this->patch(route('admin.blogs.update', $dogCategory), 
+            ['name' => 'Cat']
+        )->assertSessionHasErrors('name');        ;
+    }
 }