Add test for uploading files in arrays

features/upload_file.feature

@@ -21,7 +21,18 @@ Feature: Uploading a file
           [200, {}, [request.params["post"]["file"][:filename]]]
         end
       end
-      """    
+      """
+    Given a file named "nested_param_in_array.rb" with:
+      """
+      require 'rack'
+
+      class App
+        def self.call(env)
+          request = Rack::Request.new(env)
+          [200, {}, [request.params["post"]["files"][0][:filename]]]
+        end
+      end
+      """
 
   Scenario: Uploading a text file with nested parameters
     Given a file named "file.txt" with:
@@ -40,7 +51,7 @@ Feature: Uploading a file
 
       resource "FooBars" do
         post "/foobar" do
-          parameter :post, "Post paramter"
+          parameter :post, "Post parameter"
 
           let(:post) do
             {
@@ -161,6 +172,42 @@ Feature: Uploading a file
 
     When  I run `rspec app_spec.rb --require ./nestedparam.rb --format RspecApiDocumentation::ApiFormatter`
 
+    Then  the output should contain "1 example, 0 failures"
+    And   the exit status should be 0
+    And   the generated documentation should be encoded correctly
+
+  Scenario: Uploading an image file in params array
+    Given I move the sample image into the workspace
+    And   a file named "app_spec.rb" with:
+      """
+      require "rspec_api_documentation"
+      require "rspec_api_documentation/dsl"
+      require "rack/test"
+
+      RspecApiDocumentation.configure do |config|
+        config.app = App
+      end
+
+      resource "FooBars" do
+        post "/foobar" do
+          parameter :post, "Post parameter"
+
+          let(:post) do
+            {
+              id: 10,
+              files: [ Rack::Test::UploadedFile.new("file.png", "image/png") ]
+            }
+          end
+
+          example_request "Uploading a file" do
+            expect(response_body).to eq("file.png")
+          end
+        end
+      end
+      """
+
+    When  I run `rspec app_spec.rb --require ./nested_param_in_array.rb --format RspecApiDocumentation::ApiFormatter`
+
     Then  the output should contain "1 example, 0 failures"
     And   the exit status should be 0
     And   the generated documentation should be encoded correctly