fix: Fix parse record error verbiage

tests/test_parser_record.py

@@ -4,8 +4,10 @@
 
 import io
 import sys
+import pytest
 
 from vcfpy import parser
+from vcfpy import exceptions
 
 __author__ = "Manuel Holtgrewe <manuel.holtgrewe@bihealth.de>"
 
@@ -178,3 +180,16 @@ def test_missing_pass(recwarn):
  RESULT = p.parse_next_record()
  assert str(RESULT) == EXPECTED
  assert list(recwarn) == []
+
+
+def test_parse_line_invalid_number_of_fields():
+ """Test parsing VCF file exception message"""
+ HEADER = "##fileformat=VCFv4.2\n#CHROM\tPOS\tID\tREF\tALT\tQUAL\tFILTER\tINFO\tFORMAT\n"
+ LINES = "20\t1\t.\tC\tG\t.\tPASS\t.\tGT\n"
+ EXPECTED = "The line contains an invalid number of fields. Was 9 but expected 8"
+ p = parser.Parser(io.StringIO(HEADER + LINES), "<builtin>")
+ p.parse_header()
+ with pytest.raises(exceptions.InvalidRecordException) as record_error:
+ p.parse_next_record()
+
+ assert EXPECTED in str(record_error.value)

vcfpy/parser.py

@@ -514,7 +514,7 @@ def _split_line(self, line_str):
  raise exceptions.InvalidRecordException(
  (
  "The line contains an invalid number of fields. Was "
- "{} but expected {}\n{}".format(len(arr), 9 + len(self.samples.names), line_str)
+ "{} but expected {}\n{}".format(len(arr), self.expected_fields, line_str)
  )
  )
  return arr