Save GSGW test output file to example_data

- example data for GSGW is saved to example_data and clean up is attempted

tests/file_io_indexed_gzip_writer_test.py

@@ -30,7 +30,14 @@ def setUp(self):
     def tearDown(self):
         """ """
         self.Writer.close()
-        os.remove(os.path.abspath(os.path.join(".", "tests", "data", "unittest.mzml")))
+        try:
+            os.remove(os.path.abspath(os.path.join(".", "tests", "data", "unittest.mzml")))
+        except FileNotFoundError:
+            pass
+        try:
+            os.remove(os.path.abspath(os.path.join(".", "tests", "data", "unittest2.mzml")))
+        except FileNotFoundError:
+            pass
 
     def test_init(self):
         self.assertEqual(self.Writer.crc32, 0)
@@ -128,7 +135,9 @@ def test_add_data(self):
             "uncompressed",
             "CF_07062012_pH8_2_3A.mzML",
         )
-        self.Writer = GSGW(test_file, max_idx=80, max_idx_len=8, max_offset_len=8)
+        self.Writer = GSGW(test_file, max_idx=80, max_idx_len=8, max_offset_len=8, output_path=os.path.abspath(
+                os.path.join(".", "tests", "data", "unittest2.mzml")
+            ))
         self.Writer.add_data(test_string, "a")
         self.Writer.close()
         file = open(self.paths[0], "rb")