Add failure tests for parse_meta

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

src/lib.rs

@@ -176,23 +176,15 @@ fn parse_meta(s: Span) -> IResult<Span, Metadata> {
 		delimited(tag("#"), take_while1(|c| c != '#' && c != '\n'), tag("\n")),
 	))(s)?;
 
-	let optdesc = opt(tuple((
+	let (s, optdesc) = opt(tuple((
 		position,
 		delimited(tag("#"), take_while1(|c| c != '#' && c != '\n'), tag("\n")),
 	)))(s)?;
-
-	let mut desc: Option<&str> = None;
-	let s = match optdesc {
-		(s, Some((_pos, val))) => {
-			desc = Some(val.trim());
-			s
-		}
-		(s, None) => s,
-	};
+	let description = optdesc.map(|(_pos, d)| String::from(d.trim()));
 
 	let (s, tags) = parse_meta_tags(s)?;
 
-	let meta = Metadata::new(title.trim(), desc).with_tags(tags);
+	let meta = Metadata::new(title.trim(), description).with_tags(tags);
 	Ok((s, meta))
 }
 
@@ -390,7 +382,7 @@ mod tests {
 	}
 
 	#[test]
-	fn test_meta() {
+	fn test_meta_success() {
 		let buf1 = "# Title.\n";
 		let buf2 = "#Foo\n# Desc\n";
 		let buf3 = "#Foo\n# Desc\n## tag1\n";
@@ -400,20 +392,57 @@ mod tests {
 			parse_meta(buf1.into()).unwrap().1,
 			Metadata::new("Title.", None::<String>)
 		);
+
 		assert_eq!(
 			parse_meta(buf2.into()).unwrap().1,
 			Metadata::new("Foo", Some("Desc"))
 		);
+
 		assert_eq!(
 			parse_meta(buf3.into()).unwrap().1,
 			Metadata::new("Foo", Some("Desc")).with_tags(vec![String::from("tag1")])
 		);
+
 		assert_eq!(
 			parse_meta(buf4.into()).unwrap().1,
 			Metadata::new("Foo", None::<String>).with_tags(vec![String::from("tag1")])
 		);
 	}
 
+	#[test]
+	fn test_meta_failure() {
+		let buf1 = "# Title.";
+		let buf2 = "// Foo Title\n# Desc\n";
+		let buf3 = "##Foo\n# Desc\n## tag1\n";
+
+		// Missing newline
+		match parse_meta(buf1.into()) {
+			Err(nom::Err::Error(nom::error::Error { input, .. })) => {
+				assert_eq!(input.location_offset(), 8);
+				assert_eq!(input.location_line(), 1);
+			}
+			err => panic!("Expected Err, found: {err:?}"),
+		}
+
+		// Invalid starting tag (// not #)
+		match parse_meta(buf2.into()) {
+			Err(nom::Err::Error(nom::error::Error { input, .. })) => {
+				assert_eq!(input.location_offset(), 0);
+				assert_eq!(input.location_line(), 1);
+			}
+			err => panic!("Expected Err, found: {err:?}"),
+		}
+
+		// Only taga, missing title
+		match parse_meta(buf3.into()) {
+			Err(nom::Err::Error(nom::error::Error { input, .. })) => {
+				assert_eq!(input.location_offset(), 1);
+				assert_eq!(input.location_line(), 1);
+			}
+			err => panic!("Expected Err, found: {err:?}"),
+		}
+	}
+
 	#[test]
 	fn test_client() {
 		let buf1 = "[Client] louise\n\tjid: louise@localhost\n\tpassword: password\n";