REST API: Introduce baby API to the world.

Baby API was born at 2.8KLOC on October 8th at 2:30 UTC. API has lots
of growing to do, so wish it the best of luck.

Thanks to everyone who helped along the way:

Props rmccue, rachelbaker, danielbachhuber, joehoyle, drewapicture,
adamsilverstein, netweb, tlovett1, shelob9, kadamwhite, pento,
westonruter, nikv, tobych, redsweater, alecuf, pollyplummer, hurtige,
bpetty, oso96_2000, ericlewis, wonderboymusic, joshkadis, mordauk,
jdgrimes, johnbillion, jeremyfelt, thiago-negri, jdolan, pkevan,
iseulde, thenbrent, maxcutler, kwight, markoheijnen, phh, natewr,
jjeaton, shprink, mattheu, quasel, jmusal, codebykat, hubdotcom,
tapsboy, QWp6t, pushred, jaredcobb, justinsainton, japh, matrixik,
jorbin, frozzare, codfish, michael-arestad, kellbot, ironpaperweight,
simonlampen, alisspers, eliorivero, davidbhayes, JohnDittmar, dimadin,
traversal, cmmarslender, Toddses, kokarn, welcher, and ericpedia.

Fixes #33982.


git-svn-id: https://develop.svn.wordpress.org/trunk@34928 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/includes/spy-rest-server.php

@@ -0,0 +1,23 @@
+<?php
+
+class Spy_REST_Server extends WP_REST_Server {
+	/**
+	 * Get the raw $endpoints data from the server
+	 *
+	 * @return array
+	 */
+	public function get_raw_endpoint_data() {
+		return $this->endpoints;
+	}
+
+	/**
+	 * Allow calling protected methods from tests
+	 *
+	 * @param string $method Method to call
+	 * @param array $args Arguments to pass to the method
+	 * @return mixed
+	 */
+	public function __call( $method, $args ) {
+		return call_user_func_array( array( $this, $method ), $args );
+	}
+}