[FIX-1554] fix fixture_file_upload path resolution

Author: Laurent Cobos

lib/rspec/rails/configuration.rb

@@ -81,6 +81,10 @@ def self.initialize_configuration(config)
         config.add_setting :file_fixture_path, :default => 'spec/fixtures/files'
         config.include RSpec::Rails::FileFixtureSupport
       end
+
+      # Add support for fixture_path on fixture_file_upload
+      config.include RSpec::Rails::FixtureFileUploadSupport
+
       # This allows us to expose `render_views` as a config option even though it
       # breaks the convention of other options by using `render_views` as a
       # command (i.e. `render_views = true`), where it would normally be used

lib/rspec/rails/fixture_file_upload_support.rb

@@ -0,0 +1,43 @@
+module RSpec
+  module Rails
+    # @private
+    module FixtureFileUploadSupport
+      extend ActiveSupport::Concern
+
+      included do
+        delegate :fixture_file_upload, :to => :rails_fixture_file_wrapper
+      end
+
+    private
+
+      def rails_fixture_file_wrapper
+        resolved_fixture_path = (fixture_path || RSpec.configuration.fixture_path || '')
+        RailsFixtureFileWrapper.fixture_path = File.join(resolved_fixture_path, '')
+        RailsFixtureFileWrapper.instance
+      end
+
+      class RailsFixtureFileWrapper
+        class << self
+          attr_reader :fixture_path
+
+          # Get the instance of wrapper
+          def instance
+            @instance ||= new
+          end
+
+          # Override fixture_path set 
+          # to support Rails 3.0..3.1 using ActionController::TestCase class to resolve fixture_path
+          # see https://apidock.com/rails/v3.0.0/ActionDispatch/TestProcess/fixture_file_upload
+          def fixture_path=(value)
+            if ActionController::TestCase.respond_to?(:fixture_path)
+              ActionController::TestCase.fixture_path = value
+            end
+            @fixture_path = value
+          end
+
+          include ActionDispatch::TestProcess if defined?(ActionDispatch::TestProcess)
+        end
+      end
+    end
+  end
+end

spec/rspec/rails/fixture_file_upload_support_spec.rb

@@ -0,0 +1,32 @@
+require 'spec_helper'
+
+module RSpec::Rails
+  describe FixtureFileUploadSupport do
+    context 'with fixture path set in config' do
+      before { RSpec.configuration.fixture_path = File.dirname(__FILE__) }
+
+      it 'resolves fixture file' do
+        expect(fixture_file_upload_resolved.run).to be true
+      end
+    end
+
+    context 'with fixture path set in spec' do
+      it 'resolves fixture file' do
+        expect(fixture_file_upload_resolved(File.dirname(__FILE__)).run).to be true
+      end
+    end
+
+    def fixture_file_upload_resolved(fixture_path = nil)
+      RSpec::Core::ExampleGroup.describe do
+        include RSpec::Rails::FixtureFileUploadSupport
+
+        self.fixture_path = fixture_path if fixture_path
+
+        it 'supports fixture file upload' do
+          file = fixture_file_upload(File.basename(__FILE__))
+          expect(file.read).to match(/describe FixtureFileUploadSupport/im)
+        end
+      end
+    end
+  end
+end