Handle Hanami::AppLoadError

lib/hanami/action.rb

@@ -67,11 +67,15 @@ def self.gem_loader
       cookie_options.to_h.compact
     }
     setting :root_directory, constructor: -> (dir) {
-      if Hanami.respond_to?(:app) && Hanami.app
-        Hanami.app.root
-      else
-        Pathname(File.expand_path(dir || Dir.pwd)).realpath
+      begin
+        if Hanami.respond_to?(:app) && Hanami.app
+          return Hanami.app.root
+        end
+      rescue StandardError => exception
+        raise unless exception.is_a?(Hanami::AppLoadError)
       end
+
+      Pathname(File.expand_path(dir || Dir.pwd)).realpath
     }
     setting :public_directory, default: Config::DEFAULT_PUBLIC_DIRECTORY
     setting :before_callbacks, default: Utils::Callbacks::Chain.new, mutable: true

spec/unit/hanami/action/config_spec.rb

@@ -98,17 +98,37 @@
 
     context "within a Hanami app" do
       before do
-        app = double("Hanami.app", root: root_directory)
-
         allow(Hanami).to receive(:respond_to?).with(:app, true).and_return(true)
         allow(Hanami).to receive(:respond_to?).with(:app).and_return(true)
-        allow(Hanami).to receive(:app).and_return(app)
       end
 
+      let(:app) { double("Hanami.app", root: root_directory) }
       let(:root_directory) { Pathname.new(__dir__).join("spec") }
 
-      it "returns the Hanami app root" do
-        expect(config.root_directory).to eq(root_directory)
+      context "when app is loaded" do
+        before do
+          allow(Hanami).to receive(:app).and_return(app)
+        end
+
+        it "returns the Hanami app root" do
+          expect(config.root_directory).to eq(root_directory)
+        end
+      end
+
+      context "when app is not loaded" do
+        before do
+          unless defined?(Hanami::AppLoadError)
+            module Hanami
+              class AppLoadError < StandardError; end
+            end
+          end
+
+          expect(Hanami).to receive(:app).and_raise(Hanami::AppLoadError)
+        end
+
+        it "falls back to standalone gem logic" do
+          expect(config.root_directory).to eq(Pathname.new(Dir.pwd))
+        end
       end
     end
   end