Test round-trip writing and reading of format 24.

In order to test that both reading and writing of format 24 work
correctly, we need to write a record using 'wrsamp', then read back
what we wrote using 'rdrecord' and check that the result matches the
original record.

(Previously, 'wrsamp' worked correctly for format 24 but 'rdrecord'
did not, and thus the round-trip test would have failed.)

Author: Benjamin Moody

tests/test_record.py

@@ -140,7 +140,7 @@ def test_1e(self):
         # Test file writing
         record_2 = wfdb.rdrecord('sample-data/n8_evoked_raw_95_F1_R9', physical=False)
         record_2.wrsamp()
-        record_write = wfdb.rdrecord('sample-data/n8_evoked_raw_95_F1_R9', physical=False)
+        record_write = wfdb.rdrecord('n8_evoked_raw_95_F1_R9', physical=False)
 
         assert np.array_equal(sig, sig_target)
         assert record.__eq__(record_pn)