Add a test that checks whether 3 known subject attributes can be retrieved by NID

openssl/src/x509/tests.rs

@@ -69,3 +69,32 @@ fn test_subject_read_cn() {
 
     assert_eq!(&cn as &str, "test_cert")
 }
+
+#[test]
+fn test_nid_values() {
+    let cert_path = Path::new("test/nid_test_cert.pem");
+    let mut file = File::open(&cert_path)
+        .ok()
+        .expect("Failed to open `test/nid_test_cert.pem`");
+
+    let cert = X509::from_pem(&mut file).ok().expect("Failed to load PEM");
+    let subject = cert.subject_name();
+
+    let cn = match subject.text_by_nid(Nid::CN) {
+        Some(x) => x,
+        None => panic!("Failed to read CN from cert")
+    };
+    assert_eq!(&cn as &str, "example.com");
+
+    let email = match subject.text_by_nid(Nid::Email) {
+        Some(x) => x,
+        None => panic!("Failed to read subject email address from cert")
+    };
+    assert_eq!(&email as &str, "test@example.com");
+
+    let friendly = match subject.text_by_nid(Nid::FriendlyName) {
+        Some(x) => x,
+        None => panic!("Failed to read subject friendly name from cert")
+    };
+    assert_eq!(&friendly as &str, "Example");
+}

openssl/test/nid_test_cert.pem

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----