1 files changed, 18 insertions, 0 deletions
diff --git a/test/tc_package.rb b/test/tc_package.rb
index 628d20ae..fc48a9eb 100644
--- a/test/tc_package.rb
+++ b/test/tc_package.rb
@@ -129,12 +129,14 @@ class TestPackage < Test::Unit::TestCase
   def test_serialization
     @package.serialize(@fname)
     assert_zip_file_matches_package(@fname, @package)
+    assert_created_with_rubyzip(@fname, @package)
     File.delete(@fname)
   end
 
   def test_serialization_with_zip_command
     @package.serialize(@fname, zip_command: "zip")
     assert_zip_file_matches_package(@fname, @package)
+    assert_created_with_zip_command(@fname, @package)
     File.delete(@fname)
   end
 
@@ -142,6 +144,7 @@ class TestPackage < Test::Unit::TestCase
     fname = "#{Dir.tmpdir}/#{@fname}"
     @package.serialize(fname, zip_command: "zip")
     assert_zip_file_matches_package(fname, @package)
+    assert_created_with_zip_command(fname, @package)
     File.delete(fname)
   end
 
@@ -156,6 +159,21 @@ class TestPackage < Test::Unit::TestCase
     package.send(:parts).each{ |part| zf.get_entry(part[:entry]) }
   end
 
+  def assert_created_with_rubyzip(fname, package)
+    assert_equal 2098, get_mtime(fname, package).year, "XLSX files created with RubyZip have 2098 as the file mtime"
+  end
+
+  def assert_created_with_zip_command(fname, package)
+    assert_equal Time.now.utc.year, get_mtime(fname, package).year, "XLSX files created with a zip command have the current year as the file mtime"
+  end
+
+  def get_mtime(fname, package)
+    zf = Zip::File.open(fname)
+    part = package.send(:parts).first
+    entry = zf.get_entry(part[:entry])
+    entry.mtime.utc
+  end
+
   def test_serialization_with_deprecated_argument
     warnings = capture_warnings do
       @package.serialize(@fname, false)