Test round-trip write/read of supported binary formats (#509)

We want to test that both reading and writing work correctly for all
supported formats (although currently some binary formats are completely
unsupported for writing.)

Previous test cases covered formats 80, 212, 16, and 24 (and the FLAC
formats) but did not cover format 32.

tests/test_record.py

@@ -227,6 +227,27 @@ def test_1f(self):
                             "Mismatch in %s" % name,
                         )
 
+        # Test writing all supported formats.  (Currently not all signal
+        # formats are supported for output; keep this list in sync with
+        # 'wr_dat_file' in wfdb/io/_signal.py.)
+        OUTPUT_FMTS = ["80", "212", "16", "24", "32"]
+        channels = []
+        for i, fmt in enumerate(record.fmt):
+            if fmt in OUTPUT_FMTS:
+                channels.append(i)
+
+        partial_record = wfdb.rdrecord(
+            "sample-data/binformats",
+            physical=False,
+            channels=channels,
+        )
+        partial_record.wrsamp(write_dir=self.temp_path)
+        converted_record = wfdb.rdrecord(
+            os.path.join(self.temp_path, "binformats"),
+            physical=False,
+        )
+        assert partial_record == converted_record
+
     def test_read_write_flac(self):
         """
         All FLAC formats, multiple signal files in one record.