test_infer_sig_len: test inferring length of multi-frequency record.

If the header file does not specify the signal length, rdrecord should
calculate it from the size of the signal file.  Test that this works
correctly for multi-frequency records.

Author: Benjamin Moody

sample-data/drive02-no-len.hea

@@ -0,0 +1,6 @@
+drive02-no-len 5 15.5
+drive02.dat 16x32 1000 16 0 -1236 14736 0 ECG
+drive02.dat 16x2 1000 16 0 1802 13501 0 foot GSR
+drive02.dat 16 1.0001/bpm 16 0 75 -19070 0 HR
+drive02.dat 16 100 16 0 0 -9226 0 marker
+drive02.dat 16x2 500 16 0 5804 -14191 0 RESP

tests/test_record.py

@@ -701,9 +701,9 @@ def test_infer_sig_len(self):
         Read two headers. The records should be the same.
         """
 
-        record = wfdb.rdrecord('sample-data/100')
-        record_2 = wfdb.rdrecord('sample-data/100-no-len')
-        record_2.record_name = '100'
+        record = wfdb.rdrecord('sample-data/drive02')
+        record_2 = wfdb.rdrecord('sample-data/drive02-no-len')
+        record_2.record_name = record.record_name
 
         assert record_2.__eq__(record)