Update tests to include multiple signatures

Unlike references, multiple signatures are stored as separate key-value
pairs. Previously this crate assumed that narinfo sigs were stored as a
single key, separated by spaces.

sample.narinfo

@@ -8,3 +8,4 @@ NarSize: 11374872
 References: mhhlymrg2m70r8h94cwhv2d7a0c8l7g6-glibc-2.34-210 ppn8983d9b5r6k7mnhkbg6rqw7vgl1ij-libyaml-0.2.5 qm2lv1gpbyn0rsfai40cbvj3h4gz69yc-bash-5.1-p16 sn0w3f12547crckss4ybmnxmi29gpgq7-perl-5.34.1 zzxrhj9056vjlanfjkinvhd7458yc2z8-liblouis-3.22.0
 Deriver: dlxmsgfc0am35fh0kiy88zqr91x2dn5j-liblouis-3.22.0.drv
 Sig: cache.nixos.org-1:BJ5QGcOta2s76XC6sep9DbAv0x3TILh3hHSKyR+9rFWYuBDTWdHs1KHeUEpw2espE/zPPBp2yURO6/J4Dhf9DQ==
+Sig: fake-test-sig-1:BJ5QGcOta2s76XC6sep9DbAv0x3TILh3hHSKyR+9rFWYuBDTWdHs1KHeUEpw2espE/zPPBp2yURO6/J4Dhf9DQ==

src/narinfo/from_str.rs

@@ -23,6 +23,8 @@ impl<'a> NarInfo<'a> {
 	/// ```
 	pub fn parse(value: &'a str) -> ParsingResult<Self> {
 		let mut builder = NarInfoBuilder::default();
+		let mut sigs = Vec::new();
+
 		for line in value.lines() {
 			let (key, value) = line
 				.split_once(':')
@@ -46,20 +48,15 @@ impl<'a> NarInfo<'a> {
 				"Deriver" => builder.deriver(Some(Cow::from(value))),
 				"System" => builder.system(Some(Cow::from(value))),
 				"References" => builder.references(value.split(' ').map(Cow::from).collect()),
-				// TODO: replace with try_collect once that gets stabilized
-				"Sig" => builder.sigs(value.split(' ').map(Sig::try_from).try_fold(
-					Vec::new(),
-					|mut a, c| {
-						c.map(|c| {
-							a.push(c);
-							a
-						})
-					},
-				)?),
+				"Sig" => {
+					sigs.push(Sig::try_from(value)?);
+					&mut builder
+				},
 				_ => return Err(ParsingError::UnknownKey { key }),
 			};
 		}
 
+		builder.sigs(sigs);
 		builder.build()
 	}
 }
@@ -124,6 +121,10 @@ mod tests {
 		assert_eq!(sig.key_name, "cache.nixos.org-1");
 		assert_eq!(sig.sig, "BJ5QGcOta2s76XC6sep9DbAv0x3TILh3hHSKyR+9rFWYuBDTWdHs1KHeUEpw2espE/zPPBp2yURO6/J4Dhf9DQ==");
 
-		assert!(info.sigs.len() == 1);
+		let sig = &info.sigs[1];
+		assert_eq!(sig.key_name, "fake-test-sig-1");
+		assert_eq!(sig.sig, "BJ5QGcOta2s76XC6sep9DbAv0x3TILh3hHSKyR+9rFWYuBDTWdHs1KHeUEpw2espE/zPPBp2yURO6/J4Dhf9DQ==");
+
+		assert!(info.sigs.len() == 2);
 	}
 }

src/narinfo/to_str.rs

@@ -17,8 +17,8 @@ impl<'a> NarInfo<'a> {
 		write!(w, "\nNarSize: {}", self.nar_size)?;
 		write!(w, "\nReferences: {}", self.references.join(" "))?;
 
-		write!(w, "\nSig: ")?;
 		for sig in self.sigs.iter() {
+			write!(w, "\nSig: ")?;
 			sig.serialize_into(w)?;
 		}