Assert::uniqueValues($values, $message = '') (webmozarts#93)

* Write expected tests for uniqueValues()

* Implement uniqueValues()

* Update README to include uniqueValues()

* Refactor: save execution time counting the non-unique values just once

* Fix invalid pushed value

* Update check to use array_unique function

* Relocate Assert::uniqueValues() into Type Assertions section

* Compare 123 ans '123' to validate if they're unique values

README.md

@@ -106,6 +106,7 @@ Method                                                   | Description
 `isInstanceOfAny($value, array $classes, $message = '')` | Check that a value is an `instanceof` a at least one class on the array of classes
 `notInstanceOf($value, $class, $message = '')`           | Check that a value is not an `instanceof` a class
 `isArrayAccessible($value, $message = '')`               | Check that a value can be accessed as an array
+`uniqueValues($values, $message = '')`                   | Check that the given array contains unique values
 
 ### Comparison Assertions
 

src/Assert.php

@@ -50,6 +50,7 @@
  * @method static void nullOrIp($value, $message = '')
  * @method static void nullOrIpv4($value, $message = '')
  * @method static void nullOrIpv6($value, $message = '')
+ * @method static void nullOrUniqueValues($values, $message = '')
  * @method static void nullOrEq($value, $value2, $message = '')
  * @method static void nullOrNotEq($value,$value2,  $message = '')
  * @method static void nullOrSame($value, $value2, $message = '')
@@ -129,6 +130,7 @@
  * @method static void allIp($values, $message = '')
  * @method static void allIpv4($values, $message = '')
  * @method static void allIpv6($values, $message = '')
+ * @method static void allUniqueValues($values, $message = '')
  * @method static void allEq($values, $value2, $message = '')
  * @method static void allNotEq($values,$value2,  $message = '')
  * @method static void allSame($values, $value2, $message = '')
@@ -494,6 +496,22 @@ public static function ipv6($value, $message = '')
         }
     }
 
+    public static function uniqueValues(array $values, $message = '')
+    {
+        $allValues = count($values);
+        $uniqueValues = count(array_unique($values));
+
+        if ($allValues !== $uniqueValues) {
+            $difference = $allValues - $uniqueValues;
+
+            static::reportInvalidArgument(sprintf(
+                $message ?: 'Expected an array of unique values, but %s of them %s duplicated',
+                $difference,
+                (1 === $difference ? 'is' : 'are')
+            ));
+        }
+    }
+
     public static function eq($value, $value2, $message = '')
     {
         if ($value2 != $value) {

tests/AssertTest.php

@@ -399,6 +399,9 @@ public function getTests()
             array('ipv6', array(array()), false),
             array('ipv6', array(null), false),
             array('ipv6', array(false), false),
+            array('uniqueValues', array(array('qwerty', 'qwerty')), false),
+            array('uniqueValues', array(array('asdfg', 'qwerty')), true),
+            array('uniqueValues', array(array(123, '123')), false),
         );
     }