Add more CSR roundtrip unit tests

rcgen/tests/generic.rs

@@ -360,7 +360,10 @@ mod test_parse_other_name_alt_name {
 
 #[cfg(feature = "x509-parser")]
 mod test_csr {
-	use rcgen::{CertificateParams, CertificateSigningRequestParams, KeyPair, KeyUsagePurpose};
+	use rcgen::{
+		CertificateParams, CertificateSigningRequestParams, ExtendedKeyUsagePurpose, KeyPair,
+		KeyUsagePurpose,
+	};
 
 	#[test]
 	fn test_csr_roundtrip() {
@@ -370,10 +373,7 @@ mod test_csr {
 	}
 
 	#[test]
-	fn test_nontrivial_csr_roundtrip() {
-		let key_pair = KeyPair::generate().unwrap();
-
-		// We should be able to serialize a CSR, and then parse the CSR.
+	fn test_csr_with_key_usages_roundtrip() {
 		let mut params = CertificateParams::default();
 		params.key_usages = vec![
 			KeyUsagePurpose::DigitalSignature,
@@ -391,6 +391,24 @@ mod test_csr {
 		generate_and_test_parsed_csr(&params);
 	}
 
+	#[test]
+	fn test_csr_with_extended_key_usages_roundtrip() {
+		let mut params = CertificateParams::default();
+		params.extended_key_usages = vec![
+			ExtendedKeyUsagePurpose::ServerAuth,
+			ExtendedKeyUsagePurpose::ClientAuth,
+		];
+		generate_and_test_parsed_csr(&params);
+	}
+
+	#[test]
+	fn test_csr_with_key_usgaes_and_extended_key_usages_roundtrip() {
+		let mut params = CertificateParams::default();
+		params.key_usages = vec![KeyUsagePurpose::DigitalSignature];
+		params.extended_key_usages = vec![ExtendedKeyUsagePurpose::ClientAuth];
+		generate_and_test_parsed_csr(&params);
+	}
+
 	fn generate_and_test_parsed_csr(params: &CertificateParams) {
 		// Generate a key pair for the CSR
 		let key_pair = KeyPair::generate().unwrap();