From 99bbae80998227cd002305830f23db856c42ec8e Mon Sep 17 00:00:00 2001
From: DualFroz <me@dualfroz.com>
Date: Wed, 9 Sep 2026 15:48:30 +0200
Subject: [PATCH] test: cover
 test_dispatch_emits_process_action_event_with_status

---
 test/test_application.rb                | 28 ++++++++++++
 test/test_application_error_handling.rb | 57 +++++++++++++++++++++++++
 test/test_application_mount.rb          | 52 ++++++++++++++++++++++
 3 files changed, 137 insertions(+)
 create mode 100644 test/test_application_error_handling.rb
 create mode 100644 test/test_application_mount.rb

diff --git a/test/test_application.rb b/test/test_application.rb
index 4fcec4e..9e45b94 100644
--- a/test/test_application.rb
+++ b/test/test_application.rb
@@ -133,4 +133,32 @@ class ApplicationTest < Minitest::Test
     assert_equal 200, status
     assert_equal '', body.join
   end
+
+  def test_dispatch_emits_process_action_event_with_status
+    events = []
+    subscriber = Prism::Instrumentation.subscribe('process_action.prism') { |event| events << event }
+    begin
+      call('GET', '/users/9')
+    ensure
+      Prism::Instrumentation.unsubscribe(subscriber)
+    end
+
+    assert_equal 1, events.size
+    assert_equal 'GET', events.first.payload[:method]
+    assert_equal '/users/9', events.first.payload[:path]
+    assert_equal 200, events.first.payload[:status]
+  end
+
+  def test_dispatch_emits_event_for_not_found_too
+    events = []
+    subscriber = Prism::Instrumentation.subscribe('process_action.prism') { |event| events << event }
+    begin
+      call('GET', '/missing')
+    ensure
+      Prism::Instrumentation.unsubscribe(subscriber)
+    end
+
+    assert_equal 1, events.size
+    assert_equal 404, events.first.payload[:status]
+  end
 end
diff --git a/test/test_application_error_handling.rb b/test/test_application_error_handling.rb
new file mode 100644
index 0000000..3f12abe
--- /dev/null
+++ b/test/test_application_error_handling.rb
@@ -0,0 +1,57 @@
+require 'minitest/autorun'
+require 'prism'
+require 'support'
+
+class ErrorHandlingBoomController < Prism::Controller
+  def index
+    raise 'kaboom, no rescue_from anywhere for this one'
+  end
+end
+
+class ErrorHandlingFineController < Prism::Controller
+  def index
+    halt(200, 'fine')
+  end
+end
+
+class ErrorHandlingApp < Prism::Application
+  get '/boom', to: 'error_handling_boom#index'
+  get '/fine', to: 'error_handling_fine#index'
+end
+
+class ApplicationErrorHandlingTest < Minitest::Test
+  include TestSupport
+
+  def call(method, path, **opts)
+    ErrorHandlingApp.call(env_for(method, path, **opts))
+  end
+
+  def test_unhandled_exception_becomes_a_safe_500_instead_of_crashing_the_request
+    status, headers, body = call('GET', '/boom')
+    assert_equal 500, status
+    assert_equal 'text/plain', headers['Content-Type']
+    assert_equal 'Internal Server Error', body.join
+  end
+
+  def test_the_500_body_never_leaks_the_exception_message
+    _, _, body = call('GET', '/boom')
+    refute_includes body.join, 'kaboom'
+  end
+
+  def test_unrelated_requests_are_unaffected_by_the_fallback
+    status, _, body = call('GET', '/fine')
+    assert_equal 200, status
+    assert_equal 'fine', body.join
+  end
+
+  def test_the_exception_is_still_recorded_on_the_instrumentation_payload
+    events = []
+    subscriber = Prism::Instrumentation.subscribe('process_action.prism') { |event| events << event }
+    call('GET', '/boom')
+    klass, message = events.last.payload[:exception]
+    assert_equal 'RuntimeError', klass
+    assert_includes message, 'kaboom'
+  ensure
+    Prism::Instrumentation.unsubscribe(subscriber)
+  end
+end
diff --git a/test/test_application_mount.rb b/test/test_application_mount.rb
new file mode 100644
index 0000000..a5ebeae
--- /dev/null
+++ b/test/test_application_mount.rb
@@ -0,0 +1,52 @@
+require 'minitest/autorun'
+require 'prism'
+require 'support'
+
+class EchoMountedApp
+  def call(env)
+    [200, { 'Content-Type' => 'text/plain' },
+     ["script_name=#{env['SCRIPT_NAME']} path_info=#{env['PATH_INFO']}"]]
+  end
+end
+
+class MountApp < Prism::Application
+  mount '/admin', EchoMountedApp.new
+
+  get '/host-route' do
+    'host app route'
+  end
+end
+
+class MountPrecedenceApp < Prism::Application
+  mount '/shared', EchoMountedApp.new
+
+  get '/shared' do
+    'host app route wins'
+  end
+end
+
+class ApplicationMountTest < Minitest::Test
+  include TestSupport
+
+  def test_mounted_app_receives_rewritten_script_name_and_path_info
+    status, _, body = MountApp.call(env_for('GET', '/admin/users/1'))
+    assert_equal 200, status
+    assert_equal 'script_name=/admin path_info=/users/1', body.join
+  end
+
+  def test_mounted_app_receives_root_path_info_at_bare_prefix
+    _, _, body = MountApp.call(env_for('GET', '/admin'))
+    assert_equal 'script_name=/admin path_info=/', body.join
+  end
+
+  def test_host_applications_own_routes_take_precedence_over_mounts
+    status, _, body = MountPrecedenceApp.call(env_for('GET', '/shared'))
+    assert_equal 200, status
+    assert_equal 'host app route wins', body.join
+  end
+
+  def test_unmatched_path_outside_any_mount_still_404s
+    status, = MountApp.call(env_for('GET', '/nowhere'))
+    assert_equal 404, status
+  end
+end