diff --git a/tests/data/t.taz b/tests/data/t.taz
new file mode 100644
index 0000000..bb8e4ec
Binary files /dev/null and b/tests/data/t.taz differ
diff --git a/tests/data/t.tgz b/tests/data/t.tgz
new file mode 100644
index 0000000..e39819f
Binary files /dev/null and b/tests/data/t.tgz differ
diff --git a/tests/test_archives.py b/tests/test_archives.py
index 28833a5..9ebccea 100644
--- a/tests/test_archives.py
+++ b/tests/test_archives.py
@@ -26,11 +26,13 @@ class TestArchives (ArchiveTest):
     def test_tar_gz (self):
         self.program = 'tar'
         self.archive_commands('t.tar.gz')
+        self.archive_commands('t.tgz')
 
     @needs_codec('tar', 'compress')
     def test_tar_z (self):
         self.program = 'tar'
         self.archive_commands('t.tar.Z')
+        self.archive_commands('t.taz')
 
     @needs_codec('tar', 'bzip2')
     def test_tar_bz2 (self):
@@ -57,11 +59,13 @@ class TestArchives (ArchiveTest):
     def test_star_gz (self):
         self.program = 'star'
         self.archive_commands('t.tar.gz')
+        self.archive_commands('t.tgz')
 
     @needs_codec('tar', 'compress')
     def test_star_z (self):
         self.program = 'star'
         self.archive_commands('t.tar.Z')
+        self.archive_commands('t.taz')
 
     @needs_codec('tar', 'bzip2')
     def test_star_bz2 (self):