test: check tls server verification with addCACert

SecureContext.addCACert() adds to the existing root store,
preserving root cert entries. option.ca is applied without
calling SecureContext.addRootCerts() so should add to
the default, empty, root store.
This test confirms that the built-in root CAs are not included
when options.ca is used.
Based on:
shigeki@acd5837
Backport-PR-URL: #12468
PR-URL: #10389
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

Author: sam-github

test/internet/test-tls-add-ca-cert.js

@@ -0,0 +1,55 @@
+'use strict';
+constcommon=require('../common');
+
+if(!common.hasCrypto){
+common.skip('missing crypto');
+return;
+}
+
+// Test interaction of compiled-in CAs with user-provided CAs.
+
+constassert=require('assert');
+constfs=require('fs');
+consttls=require('tls');
+
+functionfilenamePEM(n){
+returnrequire('path').join(common.fixturesDir,'keys',n+'.pem');
+}
+
+functionloadPEM(n){
+returnfs.readFileSync(filenamePEM(n));
+}
+
+constcaCert=loadPEM('ca1-cert');
+
+constopts={
+host: 'www.nodejs.org',
+port: 443,
+rejectUnauthorized: true
+};
+
+// Success relies on the compiled in well-known root CAs
+tls.connect(opts,common.mustCall(end));
+
+// The .ca option replaces the well-known roots, so connection fails.
+opts.ca=caCert;
+tls.connect(opts,fail).on('error',common.mustCall((err)=>{
+assert.strictEqual(err.message,'unable to get local issuer certificate');
+}));
+
+functionfail(){
+assert(false,'should fail to connect');
+}
+
+// New secure contexts have the well-known root CAs.
+opts.secureContext=tls.createSecureContext();
+tls.connect(opts,common.mustCall(end));
+
+// Explicit calls to addCACert() add to the default well-known roots, instead
+// of replacing, so connection still succeeds.
+opts.secureContext.context.addCACert(caCert);
+tls.connect(opts,common.mustCall(end));
+
+functionend(){
+this.end();
+}