MultipleErrors->reason always returns [0] and should return first item from associative array (#305)

* Patch MultipleErrors->reason method by getting always the first item - Added Tests and a custom Exception

* Return EmptyReason instead of throwing exception when MultipleErrors has no reasons (validations accomplished)

Co-authored-by: Samuel Vicent <samuel.vicent@takeachef.com>

src/Result/MultipleErrors.php

@@ -2,7 +2,7 @@
 
 namespace Egulias\EmailValidator\Result;
 
-use Egulias\EmailValidator\Result\InvalidEmail;
+use Egulias\EmailValidator\Result\Reason\EmptyReason;
 use Egulias\EmailValidator\Result\Reason\Reason;
 
 /**
@@ -34,7 +34,9 @@ class MultipleErrors extends InvalidEmail
 
     public function reason() : Reason
     {
-        return $this->reasons[0];
+        return 0 !== count($this->reasons)
+            ? current($this->reasons)
+            : new EmptyReason();
     }
 
     public function description() : string

src/Result/Reason/EmptyReason.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Egulias\EmailValidator\Result\Reason;
+
+class EmptyReason implements Reason
+{
+    public function code() : int
+    {
+        return 0;
+    }
+
+    public function description() : string
+    {
+        return 'Empty reason';
+    }
+}

tests/EmailValidator/Reason/MultipleErrorsTest.php

@@ -2,10 +2,11 @@
 
 namespace Egulias\EmailValidator\Tests\EmailValidator\Reason;
 
-use PHPUnit\Framework\TestCase;
 use Egulias\EmailValidator\Result\MultipleErrors;
+use Egulias\EmailValidator\Result\Reason\EmptyReason;
 use Egulias\EmailValidator\Tests\EmailValidator\Dummy\AnotherDummyReason;
 use Egulias\EmailValidator\Tests\EmailValidator\Dummy\DummyReason;
+use PHPUnit\Framework\TestCase;
 
 class MultipleErrorsTest extends TestCase
 {
@@ -35,4 +36,31 @@ class MultipleErrorsTest extends TestCase
         $this->assertEquals($expectedReason, $multiError->description());
         $this->assertEquals($error1, $multiError->reason());
     }
+
+    public function testRetrieveFirstReasonWithReasonCodeEqualsZero(): void
+    {
+        $error1 = new DummyReason();
+
+        $multiError = new MultipleErrors();
+        $multiError->addReason($error1);
+
+        $this->assertEquals($error1, $multiError->reason());
+    }
+
+    public function testRetrieveFirstReasonWithReasonCodeDistinctToZero(): void
+    {
+        $error1 = new AnotherDummyReason();
+
+        $multiError = new MultipleErrors();
+        $multiError->addReason($error1);
+
+        $this->assertEquals($error1, $multiError->reason());
+    }
+
+    public function testRetrieveFirstReasonWithNoReasonAdded()
+    {
+        $emptyReason = new EmptyReason();
+        $multiError = new MultipleErrors();
+        $this->assertEquals($emptyReason, $multiError->reason());
+    }
 }