[Tests] handle openSSL not supporting a scheme

Technique from #38; see #37

Author: ljharb

test/index.js

@@ -28,9 +28,25 @@ fixtures.valid.rsa.forEach(function (f) {
     priv = Buffer.from(f['private'], 'base64');
   }
 
+  console.log(nCrypto.getHashes());
   (nCrypto.getHashes().indexOf(f.scheme) >= 0 ? test : test.skip)(f.message, function (t) {
-    var bSign = bCrypto.createSign(f.scheme);
-    var nSign = nCrypto.createSign(f.scheme);
+    var bSign;
+    try {
+      bSign = bCrypto.createSign(f.scheme);
+    } catch (e) {
+      console.info('skipping unsupported browserify-sign scheme', f.scheme);
+      t.end();
+      return;
+    }
+
+    try {
+      var nSign = nCrypto.createSign(f.scheme);
+    } catch (e) {
+      console.info('skipping unsupported node scheme', f.scheme);
+      t.end();
+      return;
+    }
+
     var bSig = bSign.update(message).sign(priv);
     var nSig = nSign.update(message).sign(priv);