test: http2 stream.respond() error checks

[trivikr]

This code change adds tests for the following errors in respond(headers, options):

node/lib/internal/http2/core.js

Lines 2125 to 2128 in 472cde6

	if (this.destroyed || this.closed)
	throw new errors.Error('ERR_HTTP2_INVALID_STREAM');
	if (this.headersSent)
	throw new errors.Error('ERR_HTTP2_HEADERS_SENT');

node/lib/internal/http2/core.js

Lines 2147 to 2151 in 472cde6

	if (typeof options.getTrailers !== 'function') {
	throw new errors.TypeError('ERR_INVALID_OPT_VALUE',
	'getTrailers',
	options.getTrailers);
	}

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Affected core subsystem(s)

http2

[jasnell]

CI: https://ci.nodejs.org/job/node-test-pull-request/13289/

[BridgeAR]

Landed in 5782c51 🎉

[MylesBorins]

Should this be backported to v9.x-staging? If yes please follow the guide and raise a backport PR, if not let me know or add the dont-land-on label.

[trivikr]

@MylesBorins These are just unit tests, backport to v9.x-staging is not required