Add a test for PalmImagePlugin.py

Tests/test_file_palm.py

@@ -0,0 +1,24 @@
+from helper import unittest, PillowTestCase, tearDownModule, lena
+
+import os.path
+
+
+class TestFilePalm(PillowTestCase):
+
+    def test_save_palm_p(self):
+        # Arrange
+        im = lena("P")
+        outfile = self.tempfile('temp_p.palm')
+
+        # Act
+        im.save(outfile)
+
+        # Assert
+        self.assertTrue(os.path.isfile(outfile))
+        self.assertGreater(os.path.getsize(outfile), 0)
+
+
+if __name__ == '__main__':
+    unittest.main()
+
+# End of file