test: use the same temporary directory for the whole test suite

and set Rails::Generators.templates_path to include it before the
generator classes are instantiated so that the local 'lib/templates'
directory is part of the generators' `source_paths`.

Also see railties/lib/rails/generators/base.rb and
`Rails::Generators::Base.inherited`

Author: flavorjones

Diff for: test/lib/generators/tailwindcss/controller_generator_test.rb

@@ -3,7 +3,7 @@
 
 class Tailwindcss::Generators::ControllerGeneratorTest < Rails::Generators::TestCase
   tests Tailwindcss::Generators::ControllerGenerator
-  destination Dir.mktmpdir
+  destination TAILWINDCSS_TEST_APP_ROOT
 
   arguments %w(Messages index show)
 

Diff for: test/lib/generators/tailwindcss/mailer_generator_test.rb

@@ -4,7 +4,7 @@
 
 class Tailwindcss::Generators::MailerGeneratorTest < Rails::Generators::TestCase
   tests Tailwindcss::Generators::MailerGenerator
-  destination Dir.mktmpdir
+  destination TAILWINDCSS_TEST_APP_ROOT
 
   arguments %w(Notifications invoice)
 

Diff for: test/lib/generators/tailwindcss/scaffold_generator_test.rb

@@ -3,19 +3,23 @@
 
 class Tailwindcss::Generators::ScaffoldGeneratorTest < Rails::Generators::TestCase
   tests Tailwindcss::Generators::ScaffoldGenerator
-  destination Dir.mktmpdir
+  destination TAILWINDCSS_TEST_APP_ROOT
 
   arguments %w(message title:string content:text)
 
-  test "generates correct view templates" do
+  test "generates view templates" do
     run_generator
 
-    %w(index edit new show _form _message).each { |view| assert_file "app/views/messages/#{view}.html.erb" }
+    %w(index edit new show _form _message).each do |view|
+      assert_file "app/views/messages/#{view}.html.erb"
+    end
   end
 
-  test "with namespace invoked" do
+  test "generates view templates with namespace" do
     run_generator [ "admin/role", "name:string", "description:string" ]
 
-    %w(index edit new show _form _role).each { |view| assert_file "app/views/admin/roles/#{view}.html.erb" }
+    %w(index edit new show _form _role).each do |view|
+      assert_file "app/views/admin/roles/#{view}.html.erb"
+    end
   end
 end

Diff for: test/test_helper.rb

@@ -4,10 +4,22 @@
 require "rails"
 require "rails/test_help"
 require "debug"
-require_relative "../lib/tailwindcss-rails"
 
 require "rails/test_unit/reporter"
 Rails::TestUnitReporter.executable = "bin/test"
 
+TAILWINDCSS_TEST_APP_ROOT = Dir.mktmpdir
+Rails::Generators.templates_path << File.join(TAILWINDCSS_TEST_APP_ROOT, "lib/templates")
+
 class ActiveSupport::TestCase
+  def setup
+    FileUtils.rm_rf(TAILWINDCSS_TEST_APP_ROOT)
+    FileUtils.mkdir_p(TAILWINDCSS_TEST_APP_ROOT)
+  end
+
+  def teardown
+    FileUtils.rm_rf(TAILWINDCSS_TEST_APP_ROOT)
+  end
 end
+
+require_relative "../lib/tailwindcss-rails"