Changed TestCrateFolders to be a CommandTestCase and renamed it to TestGenerateAllStringFiles.

test/fixtures/twine_key1_en_es.txt

@@ -1,4 +0,0 @@
-[[My Strings]]
-  [key1]
-    en = key1-english
-    es = key1-spanish

test/test_create_folders.rb

@@ -1,26 +0,0 @@
-require 'twine_test_case'
-
-class TestCreateFolders < TwineTestCase
-  def test_generate_all_fails_if_output_folder_does_not_exist
-    assert_raises Twine::Error do
-      execute "generate-all-string-files #{f 'twine_key1_en_es.txt'} #{@output_dir} -f apple"
-    end
-  end
-
-  def test_generate_all_creates_output_folder
-    # implicitly assert nothing raised
-    execute "generate-all-string-files #{f 'twine_key1_en_es.txt'} #{@output_dir} -f apple --create-folders"
-  end
-
-  def test_generate_all_does_not_create_folders
-    Dir.mkdir File.join @output_dir, 'en.lproj'
-    execute "generate-all-string-files #{f 'twine_key1_en_es.txt'} #{@output_dir} -f apple"
-    assert !File.exists?(File.join(@output_dir, 'es.lproj')), "language folder should not be created"
-  end
-
-  def test_generate_all_creates_folders
-    execute "generate-all-string-files #{f 'twine_key1_en_es.txt'} #{@output_dir} -f apple --create-folders"
-    assert File.exists?(File.join(@output_dir, 'en.lproj')), "language folder 'en.lproj' should be created"
-    assert File.exists?(File.join(@output_dir, 'es.lproj')), "language folder 'es.lproj' should be created"
-  end
-end

test/test_generate_all_string_files.rb

@@ -0,0 +1,44 @@
+require 'command_test_case'
+
+class TestGenerateAllStringFiles < CommandTestCase
+  class TestCreateFolders < CommandTestCase
+    def new_runner(create_folders)
+      options = {}
+      options[:output_path] = @output_dir
+      options[:format] = 'apple'
+      options[:create_folders] = create_folders
+
+      @twine_file = build_twine_file 'en', 'es' do
+        add_section 'Section' do
+          add_row key: 'value'
+        end
+      end
+
+      Twine::Runner.new(nil, options, @twine_file)
+    end
+
+    def test_fails_if_output_folder_does_not_exist
+      assert_raises Twine::Error do
+        new_runner(false).generate_all_string_files
+      end
+    end
+
+    def test_creates_output_folder
+      FileUtils.remove_entry_secure @output_dir
+      new_runner(true).generate_all_string_files
+      assert File.exists? @output_dir
+    end
+
+    def test_does_not_create_language_folders_by_default
+      Dir.mkdir File.join @output_dir, 'en.lproj'
+      new_runner(false).generate_all_string_files
+      refute File.exists?(File.join(@output_dir, 'es.lproj')), "language folder should not be created"
+    end
+
+    def test_creates_language_folders
+      new_runner(true).generate_all_string_files
+      assert File.exists?(File.join(@output_dir, 'en.lproj')), "language folder 'en.lproj' should be created"
+      assert File.exists?(File.join(@output_dir, 'es.lproj')), "language folder 'es.lproj' should be created"
+    end
+  end
+end

test/twine_test_case.rb

@@ -15,7 +15,7 @@ class TwineTestCase < Minitest::Test
   end
 
   def teardown
-    FileUtils.remove_entry_secure @output_dir
+    FileUtils.remove_entry_secure @output_dir if File.exists? @output_dir
     super
   end