1 files changed, 345 insertions, 0 deletions
diff --git a/railties/test/application/test_test.rb b/railties/test/application/test_test.rb
new file mode 100644
index 0000000000..fb43bebfbe
--- /dev/null
+++ b/railties/test/application/test_test.rb
@@ -0,0 +1,345 @@
+# frozen_string_literal: true
+
+require "isolation/abstract_unit"
+
+module ApplicationTests
+  class TestTest < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Isolation
+
+    def setup
+      @old = ENV["PARALLEL_WORKERS"]
+      ENV["PARALLEL_WORKERS"] = "0"
+
+      build_app
+    end
+
+    def teardown
+      ENV["PARALLEL_WORKERS"] = @old
+
+      teardown_app
+    end
+
+    test "simple successful test" do
+      app_file "test/unit/foo_test.rb", <<-RUBY
+        require 'test_helper'
+
+        class FooTest < ActiveSupport::TestCase
+          def test_truth
+            assert true
+          end
+        end
+      RUBY
+
+      assert_successful_test_run "unit/foo_test.rb"
+    end
+
+    test "after_run" do
+      app_file "test/unit/foo_test.rb", <<-RUBY
+        require 'test_helper'
+
+        Minitest.after_run { puts "WORLD" }
+        Minitest.after_run { puts "HELLO" }
+
+        class FooTest < ActiveSupport::TestCase
+          def test_truth
+            assert true
+          end
+        end
+      RUBY
+
+      result = assert_successful_test_run "unit/foo_test.rb"
+      assert_equal ["HELLO", "WORLD"], result.scan(/HELLO|WORLD/) # only once and in correct order
+    end
+
+    test "simple failed test" do
+      app_file "test/unit/foo_test.rb", <<-RUBY
+        require 'test_helper'
+
+        class FooTest < ActiveSupport::TestCase
+          def test_truth
+            assert false
+          end
+        end
+      RUBY
+
+      assert_unsuccessful_run "unit/foo_test.rb", "Failure:\nFooTest#test_truth"
+    end
+
+    test "integration test" do
+      controller "posts", <<-RUBY
+        class PostsController < ActionController::Base
+        end
+      RUBY
+
+      app_file "app/views/posts/index.html.erb", <<-HTML
+        Posts#index
+      HTML
+
+      app_file "test/integration/posts_test.rb", <<-RUBY
+        require 'test_helper'
+
+        class PostsTest < ActionDispatch::IntegrationTest
+          def test_index
+            get '/posts'
+            assert_response :success
+            assert_includes @response.body, 'Posts#index'
+          end
+        end
+      RUBY
+
+      assert_successful_test_run "integration/posts_test.rb"
+    end
+
+    test "enable full backtraces on test failures" do
+      app_file "test/unit/failing_test.rb", <<-RUBY
+        require 'test_helper'
+
+        class FailingTest < ActiveSupport::TestCase
+          def test_failure
+            raise "fail"
+          end
+        end
+      RUBY
+
+      output = run_test_file("unit/failing_test.rb", env: { "BACKTRACE" => "1" })
+      assert_match %r{test/unit/failing_test\.rb}, output
+      assert_match %r{test/unit/failing_test\.rb:4}, output
+    end
+
+    test "ruby schema migrations" do
+      output  = rails("generate", "model", "user", "name:string")
+      version = output.match(/(\d+)_create_users\.rb/)[1]
+
+      app_file "test/models/user_test.rb", <<-RUBY
+        require 'test_helper'
+
+        class UserTest < ActiveSupport::TestCase
+          test "user" do
+            User.create! name: "Jon"
+          end
+        end
+      RUBY
+      app_file "db/schema.rb", ""
+
+      assert_unsuccessful_run "models/user_test.rb", "Migrations are pending"
+
+      app_file "db/schema.rb", <<-RUBY
+        ActiveRecord::Schema.define(version: #{version}) do
+          create_table :users do |t|
+            t.string :name
+          end
+        end
+      RUBY
+
+      app_file "config/initializers/disable_maintain_test_schema.rb", <<-RUBY
+        Rails.application.config.active_record.maintain_test_schema = false
+      RUBY
+
+      assert_unsuccessful_run "models/user_test.rb", "Could not find table 'users'"
+
+      File.delete "#{app_path}/config/initializers/disable_maintain_test_schema.rb"
+
+      result = assert_successful_test_run("models/user_test.rb")
+      assert_not_includes result, "create_table(:users)"
+    end
+
+    test "sql structure migrations" do
+      output  = rails("generate", "model", "user", "name:string")
+      version = output.match(/(\d+)_create_users\.rb/)[1]
+
+      app_file "test/models/user_test.rb", <<-RUBY
+        require 'test_helper'
+
+        class UserTest < ActiveSupport::TestCase
+          test "user" do
+            User.create! name: "Jon"
+          end
+        end
+      RUBY
+
+      app_file "db/structure.sql", ""
+      app_file "config/initializers/enable_sql_schema_format.rb", <<-RUBY
+        Rails.application.config.active_record.schema_format = :sql
+      RUBY
+
+      assert_unsuccessful_run "models/user_test.rb", "Migrations are pending"
+
+      app_file "db/structure.sql", <<-SQL
+        CREATE TABLE "schema_migrations" ("version" varchar(255) NOT NULL);
+        CREATE UNIQUE INDEX "unique_schema_migrations" ON "schema_migrations" ("version");
+        CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar(255));
+        INSERT INTO schema_migrations (version) VALUES ('#{version}');
+      SQL
+
+      app_file "config/initializers/disable_maintain_test_schema.rb", <<-RUBY
+        Rails.application.config.active_record.maintain_test_schema = false
+      RUBY
+
+      assert_unsuccessful_run "models/user_test.rb", "Could not find table 'users'"
+
+      File.delete "#{app_path}/config/initializers/disable_maintain_test_schema.rb"
+
+      assert_successful_test_run("models/user_test.rb")
+    end
+
+    test "sql structure migrations when adding column to existing table" do
+      output_1  = rails("generate", "model", "user", "name:string")
+      version_1 = output_1.match(/(\d+)_create_users\.rb/)[1]
+
+      app_file "test/models/user_test.rb", <<-RUBY
+        require 'test_helper'
+        class UserTest < ActiveSupport::TestCase
+          test "user" do
+            User.create! name: "Jon"
+          end
+        end
+      RUBY
+
+      app_file "config/initializers/enable_sql_schema_format.rb", <<-RUBY
+        Rails.application.config.active_record.schema_format = :sql
+      RUBY
+
+      app_file "db/structure.sql", <<-SQL
+        CREATE TABLE "schema_migrations" ("version" varchar(255) NOT NULL);
+        CREATE UNIQUE INDEX "unique_schema_migrations" ON "schema_migrations" ("version");
+        CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar(255));
+        INSERT INTO schema_migrations (version) VALUES ('#{version_1}');
+      SQL
+
+      assert_successful_test_run("models/user_test.rb")
+
+      output_2  = rails("generate", "migration", "add_email_to_users")
+      version_2 = output_2.match(/(\d+)_add_email_to_users\.rb/)[1]
+
+      app_file "test/models/user_test.rb", <<-RUBY
+        require 'test_helper'
+
+        class UserTest < ActiveSupport::TestCase
+          test "user" do
+            User.create! name: "Jon", email: "jon@doe.com"
+          end
+        end
+      RUBY
+
+      app_file "db/structure.sql", <<-SQL
+        CREATE TABLE "schema_migrations" ("version" varchar(255) NOT NULL);
+        CREATE UNIQUE INDEX "unique_schema_migrations" ON "schema_migrations" ("version");
+        CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar(255), "email" varchar(255));
+        INSERT INTO schema_migrations (version) VALUES ('#{version_1}');
+        INSERT INTO schema_migrations (version) VALUES ('#{version_2}');
+      SQL
+
+      assert_successful_test_run("models/user_test.rb")
+    end
+
+    # TODO: would be nice if we could detect the schema change automatically.
+    # For now, the user has to synchronize the schema manually.
+    # This test-case serves as a reminder for this use-case.
+    test "manually synchronize test schema after rollback" do
+      output  = rails("generate", "model", "user", "name:string")
+      version = output.match(/(\d+)_create_users\.rb/)[1]
+
+      app_file "test/models/user_test.rb", <<-RUBY
+        require 'test_helper'
+
+        class UserTest < ActiveSupport::TestCase
+          test "user" do
+            assert_equal ["id", "name"], User.columns_hash.keys
+          end
+        end
+      RUBY
+      app_file "db/schema.rb", <<-RUBY
+        ActiveRecord::Schema.define(version: #{version}) do
+          create_table :users do |t|
+            t.string :name
+          end
+        end
+      RUBY
+
+      assert_successful_test_run "models/user_test.rb"
+
+      # Simulate `db:rollback` + edit of the migration file + `db:migrate`
+      app_file "db/schema.rb", <<-RUBY
+        ActiveRecord::Schema.define(version: #{version}) do
+          create_table :users do |t|
+            t.string :name
+            t.integer :age
+          end
+        end
+      RUBY
+
+      assert_successful_test_run "models/user_test.rb"
+
+      rails "db:test:prepare"
+
+      assert_unsuccessful_run "models/user_test.rb", <<-ASSERTION
+Expected: ["id", "name"]
+  Actual: ["id", "name", "age"]
+      ASSERTION
+    end
+
+    test "hooks for plugins" do
+      output  = rails("generate", "model", "user", "name:string")
+      version = output.match(/(\d+)_create_users\.rb/)[1]
+
+      app_file "lib/tasks/hooks.rake", <<-RUBY
+        task :before_hook do
+          has_user_table = ActiveRecord::Base.connection.table_exists?('users')
+          puts "before: " + has_user_table.to_s
+        end
+
+        task :after_hook do
+          has_user_table = ActiveRecord::Base.connection.table_exists?('users')
+          puts "after: " + has_user_table.to_s
+        end
+
+        Rake::Task["db:test:prepare"].enhance [:before_hook] do
+          Rake::Task[:after_hook].invoke
+        end
+      RUBY
+      app_file "test/models/user_test.rb", <<-RUBY
+        require 'test_helper'
+        class UserTest < ActiveSupport::TestCase
+          test "user" do
+            User.create! name: "Jon"
+          end
+        end
+      RUBY
+
+      # Simulate `db:migrate`
+      app_file "db/schema.rb", <<-RUBY
+        ActiveRecord::Schema.define(version: #{version}) do
+          create_table :users do |t|
+            t.string :name
+          end
+        end
+      RUBY
+
+      output = assert_successful_test_run "models/user_test.rb"
+      assert_includes output, "before: false\nafter: true"
+
+      # running tests again won't trigger a schema update
+      output = assert_successful_test_run "models/user_test.rb"
+      assert_not_includes output, "before:"
+      assert_not_includes output, "after:"
+    end
+
+    private
+      def assert_unsuccessful_run(name, message)
+        result = run_test_file(name)
+        assert_not_equal 0, $?.to_i
+        assert_includes result, message
+        result
+      end
+
+      def assert_successful_test_run(name)
+        result = run_test_file(name)
+        assert_equal 0, $?.to_i, result
+        result
+      end
+
+      def run_test_file(name, options = {})
+        rails "test", "#{app_path}/test/#{name}", allow_failure: true
+      end
+  end
+end