Migrate server transport test

[matux]

Description of the change

This PR migrates the server test transport to mocha from vows.

Related issues

SDK-490/migrate-vowsjs-to-mocha
SDK-491/complete-server-test-es-module-migration

[Copilot]

Pull Request Overview

Migrate the server transport tests from Vows.js to Mocha with Chai assertions

• Remove the legacy vows-based test suite
• Add a new ES module–based Mocha test file using describe/it and expect
• Replicate existing test scenarios (payload handling, error cases, rate limiting) in the new framework

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
test/server.transport.test.js	Deleted old Vows.js–based transport tests
test/server.transport.mocha.test.js	Added new Mocha/Chai–based transport tests

[Copilot]

Using expect(err).to.be.null may fail if err is undefined. Prefer expect(err).to.not.exist for clarity and to cover both null and undefined cases.

Suggested change

	expect(err).to.be.null;
	expect(err).to.not.exist;

[Copilot]

This test calls transport.post without providing the stubbed transportFactory, which may trigger real HTTP requests. Add a factory argument to isolate and stub out external calls.

Suggested change

	transport.post('token', {}, 'payload', function (err) {
	expect(err.message).to.match(/Exceeded rate limit/);
	expect(Math.floor(Date.now() / 1000)).to.be.below(
	transport.rateLimitExpires,
	);
	done();
	});
	const factory = transportFactory(
	new Error('Exceeded rate limit'),
	null,
	);
	transport.post('token', {}, 'payload', function (err) {
	expect(err.message).to.match(/Exceeded rate limit/);
	expect(Math.floor(Date.now() / 1000)).to.be.below(
	transport.rateLimitExpires,
	);
	done();
	}, factory);