Fixes #1313

app/controllers/custom_directories.rb

@@ -16,7 +16,7 @@ module WPScan
 
         return if target.content_dir
 
-        raise 'Unable to identify the wp-content dir, please supply it with --wp-content-dir'
+        raise WpContentDirNotDetected
       end
     end
   end

lib/wpscan/errors/wordpress.rb

@@ -19,4 +19,10 @@ module WPScan
       'The WordPress version is invalid'
     end
   end
+
+  class WpContentDirNotDetected < Error
+    def to_s
+      'Unable to identify the wp-content dir, please supply it with --wp-content-dir'
+    end
+  end
 end

spec/app/controllers/custom_directories_spec.rb

@@ -22,12 +22,8 @@ describe WPScan::Controller::CustomDirectories do
     context 'when the content_dir is not found and not supply' do
       before { expect(controller.target).to receive(:content_dir) }
 
-      let(:exception) do
-        'Unable to identify the wp-content dir, please supply it with --wp-content-dir'
-      end
-
       it 'raises an exception' do
-        expect { controller.before_scan }.to raise_error(exception)
+        expect { controller.before_scan }.to raise_error(WPScan::WpContentDirNotDetected)
       end
     end