type support for Faker::Types.rb_array (faker-ruby#2771)

doc/default/types.md

@@ -25,6 +25,7 @@ Faker::Types.complex_rb_hash(number: 2) #=> {user: {first: "bob", last: "marley"
 # Random Array
 Faker::Types.rb_array #=> ["a"]
 Faker::Types.rb_array(len: 4) #=> ["a", 1, 2, "bob"]
+Faker::Types.rb_array(len: 2, type: -> { Faker::Types.rb_string }) #=> ["cat", "foo"]
 
 # Random Type (string, or integer)
 Faker::Types.random_type #=> 1 or "a" or "bob"

lib/faker/default/types.rb

@@ -97,12 +97,13 @@ def complex_rb_hash(number: 1)
       # @example
       #   Faker::Types.rb_array #=> ["a"]
       #   Faker::Types.rb_array(len: 4) #=> ["a", 1, 2, "bob"]
+      #   Faker::Types.rb_array(len: 2, type: -> { Faker::Types.rb_string }) #=> ["cat", "foo"]
       #
       # @faker.version 1.8.6
-      def rb_array(len: 1)
+      def rb_array(len: 1, type: -> { random_type })
         [].tap do |ar|
           len.times do
-            ar.push random_type
+            ar.push type.is_a?(Proc) ? type.call : type
           end
         end
       end

test/faker/default/test_faker_types.rb

@@ -62,6 +62,12 @@ def test_rb_array_returns_array
     assert_instance_of Array, @tester.rb_array
   end
 
+  def test_rb_array_returns_right_type_of_array
+    @tester.rb_array(len: 3, type: -> { @tester.rb_string }).each do |value|
+      assert_instance_of String, value
+    end
+  end
+
   def test_array_has_the_right_array
     assert_equal(3, @tester.rb_array(len: 3).length)
     assert_empty @tester.rb_array(len: 0)