Use :message key, not :error for File::Service.

app/controllers/projects/blob_controller.rb

@@ -20,7 +20,7 @@ def destroy
       flash[:notice] = "Your changes have been successfully committed"
       redirect_to project_tree_path(@project, @ref)
     else
-      flash[:alert] = result[:error]
+      flash[:alert] = result[:message]
       render :show
     end
   end

app/controllers/projects/edit_tree_controller.rb

@@ -22,7 +22,7 @@ def update
 
       redirect_to after_edit_path
     else
-      flash[:alert] = result[:error]
+      flash[:alert] = result[:message]
       render :show
     end
   end

app/services/files/base_service.rb

@@ -10,12 +10,6 @@ def initialize(project, user, params, ref, path = nil)
 
     private
 
-    def success
-      out = super()
-      out[:error] = ''
-      out
-    end
-
     def repository
       project.repository
     end

features/project/source/browse_files.feature

@@ -34,6 +34,16 @@ Feature: Project Browse files
     Then I am redirected to the new file
     And I should see its new content
 
+  @javascript
+  Scenario: If I enter an illegal file name I see an error message
+    Given I click on "new file" link in repo
+    And I fill the new file name with an illegal name
+    And I edit code
+    And I fill the commit message
+    And I click on "Commit changes"
+    Then I am on the new file page
+    And I see a commit error message
+
   @javascript
   Scenario: I can edit file
     Given I click on ".gitignore" file in repo
@@ -50,6 +60,16 @@ Feature: Project Browse files
     Then I am redirected to the ".gitignore"
     And I should see its new content
 
+  @javascript  @wip
+  Scenario: If I don't change the content of the file I see an error message
+    Given I click on ".gitignore" file in repo
+    And I click button "edit"
+    And I fill the commit message
+    And I click on "Commit changes"
+    # Test fails because carriage returns are added to the file.
+    Then I am on the ".gitignore" edit file page
+    And I see a commit error message
+
   @javascript
   Scenario: I can see editing preview
     Given I click on ".gitignore" file in repo

features/steps/project/browse_files.rb

@@ -61,6 +61,10 @@ class Spinach::Features::ProjectBrowseFiles < Spinach::FeatureSteps
     fill_in :file_name, with: new_file_name
   end
 
+  step 'I fill the new file name with an illegal name' do
+    fill_in :file_name, with: '.git'
+  end
+
   step 'I fill the commit message' do
     fill_in :commit_message, with: 'Not yet a commit message.'
   end
@@ -151,6 +155,10 @@ class Spinach::Features::ProjectBrowseFiles < Spinach::FeatureSteps
     expect(page).not_to have_link('permalink')
   end
 
+  step 'I see a commit error message' do
+    expect(page).to have_content('Your changes could not be committed')
+  end
+
   private
 
   def set_new_content

features/steps/shared/paths.rb

@@ -265,6 +265,15 @@ module SharedPaths
     visit project_blob_path(@project, File.join(root_ref, '.gitignore'))
   end
 
+  step 'I am on the new file page' do
+    current_path.should eq(project_new_tree_path(@project, root_ref))
+  end
+
+  step 'I am on the ".gitignore" edit file page' do
+    current_path.should eq(project_edit_tree_path(
+      @project, File.join(root_ref, '.gitignore')))
+  end
+
   step 'I visit project source page for "6d39438"' do
     visit project_tree_path(@project, "6d39438")
   end

lib/api/files.rb

@@ -85,7 +85,7 @@ class Files < Grape::API
             branch_name: branch_name
           }
         else
-          render_api_error!(result[:error], 400)
+          render_api_error!(result[:message], 400)
         end
       end
 
@@ -117,7 +117,7 @@ class Files < Grape::API
             branch_name: branch_name
           }
         else
-          render_api_error!(result[:error], 400)
+          render_api_error!(result[:message], 400)
         end
       end
 
@@ -149,7 +149,7 @@ class Files < Grape::API
             branch_name: branch_name
           }
         else
-          render_api_error!(result[:error], 400)
+          render_api_error!(result[:message], 400)
         end
       end
     end