Write the file in binary mode to fix any encoding issues

lib/pansophy/local/create_file.rb

@@ -11,7 +11,9 @@ def initialize(path, body)
       def call(options = {})
         prevent_overwrite! unless options[:overwrite]
         @pathname.dirname.mkpath
-        ::File.write(@pathname, @body)
+        ::File.open(@pathname, 'wb') do |f|
+          f.write @body
+        end
       end
 
       private

spec/synchronizer_spec.rb

@@ -18,7 +18,7 @@
   let(:local_directory) { Pathname.new(__FILE__).dirname.expand_path.join(local_directory_name) }
   let(:local_file) { 'wat.txt' }
   let(:file_name) { 'test.yml' }
-  let(:file_body) { { test: true }.to_yaml }
+  let(:file_body) { { test: true, message: '用' }.to_yaml }
   let(:inner_file_1) { 'sub/inner1.txt' }
   let(:inner_file_2) { 'sub/inner2.txt' }
   let(:inner_file_1_body) { 'inner file 1' }
@@ -321,6 +321,18 @@ def get_remote_file(path)
       expect(path).not_to exist
     end
 
+    context 'when creating a file with default internal encoding set to utf-8' do
+      let(:file_body) { '用'.force_encoding('ASCII-8BIT') }
+      before do
+        Encoding.default_internal = Encoding::UTF_8
+        create_file.call
+      end
+
+      it 'should save the file correctly, and be readable as utf-8' do
+        expect(path.read).to eq file_body.force_encoding('UTF-8')
+      end
+    end
+
     context 'when creating a file' do
       before do
         create_file.call