Add test for file name standardization.
diff --git a/regress/utf-8-standardization-input.zip b/regress/utf-8-standardization-input.zip
new file mode 100644
index 0000000..67e3acf
--- /dev/null
+++ b/regress/utf-8-standardization-input.zip
Binary files differ
diff --git a/regress/utf-8-standardization-output.zip b/regress/utf-8-standardization-output.zip
new file mode 100644
index 0000000..66a58e2
--- /dev/null
+++ b/regress/utf-8-standardization-output.zip
Binary files differ
diff --git a/regress/utf-8-standardization.test b/regress/utf-8-standardization.test
new file mode 100644
index 0000000..939600c
--- /dev/null
+++ b/regress/utf-8-standardization.test
@@ -0,0 +1,5 @@
+# replace file contents and make UTF-8 name
+program modify
+return 0
+args testfile.zip replace_file_contents 0 "Some new content for the file."
+file testfile.zip utf-8-standardization-input.zip utf-8-standardization-output.zip
