test: more regression tests for minDHSize option

Check that tls.connect() fails in the expected way when passing in
invalid minDHSize options.

PR-URL: https://github.com/nodejs/node/pull/3629
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

lib/_tls_wrap.js

@@ -974,7 +974,7 @@ exports.connect = function(/* [port, host], options, cb */) {
   assert(typeof options.minDHSize === 'number',
          'options.minDHSize is not a number: ' + options.minDHSize);
   assert(options.minDHSize > 0,
-         'options.minDHSize is not a posivie number: ' +
+         'options.minDHSize is not a positive number: ' +
          options.minDHSize);
 
   var hostname = options.servername ||

test/parallel/test-tls-client-mindhsize.js

@@ -78,6 +78,15 @@ testDHE1024();
 assert.throws(() => test(512, true, assert.fail),
               /DH parameter is less than 1024 bits/);
 
+[0, -1, -Infinity, NaN].forEach(minDHSize => {
+  assert.throws(() => tls.connect({ minDHSize }),
+                /minDHSize is not a positive number/);
+});
+
+[true, false, null, undefined, {}, [], '', '1'].forEach(minDHSize => {
+  assert.throws(() => tls.connect({ minDHSize }), /minDHSize is not a number/);
+});
+
 process.on('exit', function() {
   assert.equal(nsuccess, 1);
   assert.equal(nerror, 1);