Add age attribute for user model

app/User.php

@@ -2,6 +2,7 @@
 
 namespace App;
 
+use Carbon\Carbon;
 use Ramsey\Uuid\Uuid;
 use Illuminate\Notifications\Notifiable;
 use Illuminate\Foundation\Auth\User as Authenticatable;
@@ -230,4 +231,17 @@ class User extends Authenticatable
     {
         return $this->hasMany(Couple::class, 'manager_id');
     }
+
+    public function getAgeAttribute()
+    {
+        $age = null;
+
+        if ($this->dob) {
+            $age = Carbon::parse($this->dob)->diffInYears($this->dod);
+        } elseif (!$this->dob && $this->yob) {
+            $age = date('Y') - $this->yob;
+        }
+
+        return $age;
+    }
 }

tests/Unit/UserTest.php

@@ -4,6 +4,7 @@ namespace Tests\Unit;
 
 use App\User;
 use App\Couple;
+use Carbon\Carbon;
 use Tests\TestCase;
 use Illuminate\Support\Collection;
 use Illuminate\Foundation\Testing\RefreshDatabase;
@@ -145,4 +146,29 @@ class UserTest extends TestCase
         $this->assertInstanceOf(Collection::class, $user->managedCouples);
         $this->assertInstanceOf(Couple::class, $user->managedCouples->first());
     }
+
+    /**
+     * @test
+     * @dataProvider userAgeDataProvider
+     */
+    public function user_has_age_attribute($now, $dob, $yob, $dod, $yod, $age)
+    {
+        Carbon::setTestNow($now);
+        $user = factory(User::class)->make([
+            'dob' => $dob, 'yob' => $yob, 'dod' => $dod, 'yod' => $yod,
+        ]);
+
+        $this->assertEquals($age, $user->age);
+
+        Carbon::setTestNow();
+    }
+
+    public function userAgeDataProvider()
+    {
+        // returning array of now, dob, yob, dod, yod, age.
+        return [
+            ['2018-02-02 01:00:00', '1997-01-01', '1997', null, null, 21],
+            ['2018-02-02 01:00:00', null, '1997', null, null, 22],
+        ];
+    }
 }