diff --git a/noodles-vcf/src/io/writer/record/info/field/value.rs b/noodles-vcf/src/io/writer/record/info/field/value.rs
index 5ed3bc4d2..489c621e3 100644
--- a/noodles-vcf/src/io/writer/record/info/field/value.rs
+++ b/noodles-vcf/src/io/writer/record/info/field/value.rs
@@ -19,3 +19,39 @@ where
         Value::Array(array) => write_array(writer, array),
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use std::borrow::Cow;
+
+    use super::*;
+
+    #[test]
+    fn test_write_value() -> io::Result<()> {
+        use crate::variant::record_buf::info::field::Value as ValueBuf;
+
+        fn t(buf: &mut Vec<u8>, value: &Value<'_>, expected: &[u8]) -> io::Result<()> {
+            buf.clear();
+            write_value(buf, value)?;
+            assert_eq!(buf, expected);
+            Ok(())
+        }
+
+        let mut buf = Vec::new();
+
+        t(&mut buf, &Value::Integer(0), b"0")?;
+        t(&mut buf, &Value::Float(0.0), b"0")?;
+        t(&mut buf, &Value::Flag, b"")?;
+
+        t(&mut buf, &Value::Character('n'), b"n")?;
+        t(&mut buf, &Value::Character(';'), b";")?; // FIXME
+
+        t(&mut buf, &Value::String(Cow::from("ndls")), b"ndls")?;
+        t(&mut buf, &Value::String(Cow::from("n;d")), b"n%3Bd")?;
+
+        let value_buf = ValueBuf::from(vec![Some(8), Some(13), None]);
+        t(&mut buf, &Value::from(&value_buf), b"8,13,.")?;
+
+        Ok(())
+    }
+}