Generate agent tests with an existing Rails superclass

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- **Generate runnable agent tests** (`activeagent`). TestUnit agent tests
+  inherit from `ActiveSupport::TestCase` instead of the nonexistent
+  `ActiveAgent::TestCase`. Plain and namespaced agents, including agents
+  without actions, can load in a Rails host without calling a provider.
+
 ### Changed
 
 - **One badge for every status and message role in the dashboard**

lib/generators/test_unit/templates/functional_test.rb.tt

@@ -1,7 +1,7 @@
 require "test_helper"
 
 <% module_namespacing do -%>
-class <%= class_name %>AgentTest < ActiveAgent::TestCase
+class <%= class_name %>AgentTest < ActiveSupport::TestCase
 <% actions.each_with_index do |action, index| -%>
 <% if index != 0 -%>
 

test/generators/active_agent/generated_agent_test.rb

@@ -0,0 +1,52 @@
+require "test_helper"
+require "generators/active_agent/agent/agent_generator"
+require "open3"
+
+class ActiveAgent::Generators::GeneratedAgentTest < Rails::Generators::TestCase
+  tests ActiveAgent::Generators::AgentGenerator
+  destination Rails.root.join("tmp/generated_agent_tests")
+  setup :prepare_destination
+
+  test "generated agent tests run in a Rails host" do
+    assert_generated_tests_run "generated_example", 2
+  end
+
+  test "generated namespaced agent tests run in a Rails host" do
+    assert_generated_tests_run "admin/generated_example", 2
+  end
+
+  test "generated agent tests without actions load in a Rails host" do
+    assert_generated_tests_run "generated_example", 0, actions: []
+  end
+
+  private
+
+  def assert_generated_tests_run(name, count, actions: %w[create update])
+    run_generator [ name, *actions, "--test-framework=test_unit" ]
+    FileUtils.mkdir_p(File.join(destination_root, "config"))
+    File.write(File.join(destination_root, "config/routes.rb"), "Rails.application.routes.draw {}\n")
+    File.write(File.join(destination_root, "test/test_helper.rb"), <<~RUBY)
+      ENV["RAILS_ENV"] = "test"
+      require "rails"
+      require "active_model/railtie"
+      require "active_job/railtie"
+      require "action_controller/railtie"
+      require "active_agent"
+      class GeneratedHost < Rails::Application
+        config.root = File.expand_path("..", __dir__)
+        config.eager_load = false
+        config.secret_key_base = "synthetic-test-secret"
+        config.logger = Logger.new(File::NULL)
+      end
+      GeneratedHost.initialize!
+      require "rails/test_help"
+    RUBY
+
+    output, status = Open3.capture2e(
+      RbConfig.ruby, "-Itest", "test/agents/#{name}_agent_test.rb",
+      chdir: destination_root
+    )
+    assert status.success?, output
+    assert_match(/#{count} runs, #{count} assertions, 0 failures, 0 errors/, output)
+  end
+end

test/generators/test_unit/agent_generator_test.rb

@@ -10,7 +10,7 @@ class TestUnit::Generators::AgentGeneratorTest < Rails::Generators::TestCase
     run_generator [ "user", "create", "update" ]
 
     assert_file "test/agents/user_agent_test.rb" do |content|
-      assert_match(/class UserAgentTest < ActiveAgent::TestCase/, content)
+      assert_match(/class UserAgentTest < ActiveSupport::TestCase/, content)
       assert_match(/test "create"/, content)
       assert_match(/test "update"/, content)
     end
@@ -30,7 +30,7 @@ class TestUnit::Generators::AgentGeneratorTest < Rails::Generators::TestCase
     run_generator [ "admin/user", "create" ]
 
     assert_file "test/agents/admin/user_agent_test.rb" do |content|
-      assert_match(/class Admin::UserAgentTest < ActiveAgent::TestCase/, content)
+      assert_match(/class Admin::UserAgentTest < ActiveSupport::TestCase/, content)
     end
 
     assert_file "test/docs/previews/admin/user_agent_preview.rb" do |content|
@@ -47,15 +47,15 @@ class TestUnit::Generators::AgentGeneratorTest < Rails::Generators::TestCase
     run_generator [ "user_agent", "create" ]
 
     assert_file "test/agents/user_agent_test.rb" do |content|
-      assert_match(/class UserAgentTest < ActiveAgent::TestCase/, content)
+      assert_match(/class UserAgentTest < ActiveSupport::TestCase/, content)
     end
   end
 
   test "generates test without actions" do
     run_generator [ "user" ]
 
     assert_file "test/agents/user_agent_test.rb" do |content|
-      assert_match(/class UserAgentTest < ActiveAgent::TestCase/, content)
+      assert_match(/class UserAgentTest < ActiveSupport::TestCase/, content)
       assert_no_match(/^  test "/, content) # No actual test methods (only commented ones)
     end