Fixed bug in calculation of Assert::isInMonth

Author: nilportugues

src/Assertions/DateTimeAssertions.php

@@ -606,10 +606,14 @@ public static function isInLastMonth($value, $message = '')
     public static function isInMonth($value, $monthNumber, $message = '')
     {
         $value = self::convertToDateTime($value);
+        $currentYear = date('Y');
 
-        if ($value->format('n') != $monthNumber) {
+
+        if ($currentYear != $value->format('Y') ||
+            $monthNumber != $value->format('n')
+        ) {
             throw new AssertionException(
-                ($message) ? $message : sprintf(self::ASSERT_IS_IN_MONTH, (new DateTime($monthNumber))->format('F'))
+                ($message) ? $message : sprintf(self::ASSERT_IS_IN_MONTH, (new DateTime('1970-'.$monthNumber.'-01'))->format('F'))
             );
         }
     }

tests/AssertDateTimeTest.php

@@ -394,7 +394,7 @@ public function testItIsInLastMonthThrowsException()
 
     public function testItIsInMonth()
     {
-        $next = new DateTime('07-02-2015');
+        $next = new DateTime('01-02-'.date('Y'));
         Assert::isInMonth($next, 2);
     }