Speed up Internet::Password generation using constants

lib/faker/default/internet.rb

@@ -170,23 +170,23 @@ def password(min_length: 8, max_length: 16, mix_case: true, special_characters:
         character_bag = []
 
         # use lower_chars by default and add upper_chars if mix_case
-        lower_chars = ('a'..'z').to_a
-        password << lower_chars[rand(lower_chars.count - 1)]
+        lower_chars = self::LLetters
+        password << sample(lower_chars)
         character_bag += lower_chars
 
-        if character_types.include?(:mix_case)
-          upper_chars = ('A'..'Z').to_a
-          password << upper_chars[rand(upper_chars.count - 1)]
+        if mix_case
+          upper_chars = self::ULetters
+          password << sample(upper_chars)
           character_bag += upper_chars
         end
 
-        if character_types.include?(:special_characters)
+        if special_characters
           special_chars = %w[! @ # $ % ^ & *]
-          password << special_chars[rand(special_chars.count - 1)]
+          password << sample(special_chars)
           character_bag += special_chars
         end
 
-        password << character_bag[rand(character_bag.count - 1)] while password.length < target_length
+        password << sample(character_bag) while password.length < target_length
 
         shuffle(password).join
       end

test/faker/default/test_faker_internet.rb

@@ -117,7 +117,7 @@ def test_username_with_range_and_separators
   end
 
   def test_password
-    assert_match(/\w{3}/, @tester.password)
+    assert_match(/\w{8}/, @tester.password)
   end
 
   def test_password_with_integer_arg