Ensure to generate input_class only for the input, not for the wrapper

Thanks @ollym for catching this one. Related to #337.

CHANGELOG.md

@@ -1,13 +1,14 @@
 ## master
 
 ### enhancements
+  * New `input_class` global config option to set a class to be generated in all inputs.
   * Collection tags accept html attributes as the last element of collection [@nashby](https://github.com/nashby)
   * Change default `:value_method` of collection tags from `:last` to `:second` [@nashby](https://github.com/nashby)
   * Support `Proc` object in `:conditions` option of associations [@bradly](https://github.com/bradly)
   * `input_field` supports `html5` component [@nashby](https://github.com/nashby)
 
 ### bug fix
-  * Make `DateTimeInput#label_target` method to work with string values in `I18n.t('date.order')` (default 
+  * Make `DateTimeInput#label_target` method to work with string values in `I18n.t('date.order')` (default
   behaviour in Rails 4)
   Closes [#846](https://github.com/plataformatec/simple_form/issues/846) [@mjankowski](https://github.com/mjankowski)
   * Add "checkbox" class to the label of boolean input when there is no `:label`

lib/simple_form/inputs/base.rb

@@ -65,6 +65,10 @@ module SimpleForm
         @html_classes = SimpleForm.additional_classes_for(:input) { additional_classes }
 
         @input_html_classes = @html_classes.dup
+        if SimpleForm.input_class && !input_html_classes.empty?
+          input_html_classes << SimpleForm.input_class
+        end
+
         @input_html_options = html_options_for(:input, input_html_classes).tap do |o|
           o[:readonly]  = true if has_readonly?
           o[:disabled]  = true if has_disabled?
@@ -81,7 +85,7 @@ module SimpleForm
       end
 
       def additional_classes
-        @additional_classes ||= [input_type, required_class, readonly_class, disabled_class, SimpleForm.input_class].compact
+        @additional_classes ||= [input_type, required_class, readonly_class, disabled_class].compact
       end
 
       def input_class

test/inputs/general_test.rb

@@ -20,10 +20,19 @@ class InputTest < ActionView::TestCase
     assert_select 'input.string[autofocus]'
   end
 
-  test 'input should accepts input class configuration' do
-    swap SimpleForm, :input_class => :xlarge do
+  test 'input accepts input_class configuration' do
+    swap SimpleForm, input_class: :xlarge do
       with_input_for @user, :name, :string
       assert_select 'input.xlarge'
+      assert_no_select 'div.xlarge'
+    end
+  end
+
+  test 'input does not add input_class when configured to not generate additional classes for input' do
+    swap SimpleForm, input_class: 'xlarge', generate_additional_classes_for: [:wrapper] do
+      with_input_for @user, :name, :string
+      assert_select 'input'
+      assert_no_select '.xlarge'
     end
   end