test: add strictEqual method to assert

Adds strictEqual method to assert on stream.session.alpnProtocol
to verify expected value 'h2'. This changes 'h2' from an assertion
error message to the value expected from stream.session.alpnProtocol.

Backport-PR-URL: #22850
PR-URL: #20189
Reviewed-By: Rich Trott <[email protected]>
Reviewed-By: Richard Lau <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>

Author: 9christine

test/parallel/test-http2-create-client-secure-session.js

@@ -21,7 +21,7 @@ function onStream(stream, headers) {
   const socket = stream.session[kSocket];
 
   assert(stream.session.encrypted);
-  assert(stream.session.alpnProtocol, 'h2');
+  assert.strictEqual(stream.session.alpnProtocol, 'h2');
   const originSet = stream.session.originSet;
   assert(Array.isArray(originSet));
   assert.strictEqual(originSet[0],