Add explicit tests, update docblock for Str::pluralStudly (#39726)

Author: michaeldyrynda

src/Illuminate/Support/Str.php

@@ -533,7 +533,7 @@ public static function plural($value, $count = 2)
      * Pluralize the last word of an English, studly caps case string.
      *
      * @param  string  $value
-     * @param  int  $count
+     * @param  int|array|\Countable  $count
      * @return string
      */
     public static function pluralStudly($value, $count = 2)

tests/Support/SupportPluralizerTest.php

@@ -99,6 +99,20 @@ public function testPluralSupportsCollections()
         $this->assertSame('users', Str::plural('user', collect(['one', 'two'])));
     }
 
+    public function testPluralStudlySupportsArrays()
+    {
+        $this->assertPluralStudly('SomeUsers', 'SomeUser', []);
+        $this->assertPluralStudly('SomeUser', 'SomeUser', ['one']);
+        $this->assertPluralStudly('SomeUsers', 'SomeUser', ['one', 'two']);
+    }
+
+    public function testPluralStudlySupportsCollections()
+    {
+        $this->assertPluralStudly('SomeUsers', 'SomeUser', collect());
+        $this->assertPluralStudly('SomeUser', 'SomeUser', collect(['one']));
+        $this->assertPluralStudly('SomeUsers', 'SomeUser', collect(['one', 'two']));
+    }
+
     private function assertPluralStudly($expected, $value, $count = 2)
     {
         $this->assertSame($expected, Str::pluralStudly($value, $count));