Add basic tests for start_line_number and position

src/parser/record.rs

@@ -225,3 +225,40 @@ pub fn write_fastq(
     writer.write_all(&ending)?;
     Ok(())
 }
+
+#[cfg(test)]
+mod test {
+    use std::io::Cursor;
+
+    use crate::parse_fastx_reader;
+    fn seq(s: &[u8]) -> Cursor<&[u8]> { Cursor::new(s) }
+
+    #[test]
+    fn test_start_line_number() {
+        let mut reader = parse_fastx_reader(seq(
+            b"@test\nACGT\n+\nIIII\n@test2\nACGT\n+\nIIII"
+        )).unwrap();
+
+        let rec = reader.next().unwrap().unwrap();
+        assert_eq!(rec.start_line_number(), 1);
+
+        let rec = reader.next().unwrap().unwrap();
+        assert_eq!(rec.start_line_number(), 5);
+    }
+
+    #[test]
+    fn test_position() {
+        let mut reader = parse_fastx_reader(seq(
+            b"@test1\nACGT\n+\nIIII\n@test222\nACGT\n+\nIIII\n@test3\nACGT\n+\nIIII"
+        )).unwrap();
+
+        let rec = reader.next().unwrap().unwrap();
+        assert_eq!(rec.position().byte(), 0);
+
+        let rec = reader.next().unwrap().unwrap();
+        assert_eq!(rec.position().byte(), 19);
+
+        let rec = reader.next().unwrap().unwrap();
+        assert_eq!(rec.position().byte(), 40);
+    }
+}