Random Battles: Add basic unit test framework

This will save me a lot of time typing in `/eval`s on localhost to test, and also hopefully catch regressions!

.mocharc.json

@@ -1,5 +1,5 @@
 {
-  "spec": ["test/main.js", "test/lib/**/*.js", "test/server/**/*.js", "test/sim/**/*.js", "test/tools/**/*.js"],
+  "spec": ["test/main.js", "test/lib/**/*.js", "test/server/**/*.js", "test/sim/**/*.js", "test/tools/**/*.js", "test/random-battles/**/*.js"],
   "grep": "^((?!\\(slow\\)).)*$",
   "reporter": "dot",
   "ui": "bdd",

CODEOWNERS

@@ -17,3 +17,4 @@ server/chat-plugins/scavenger*.ts @xfix @sparkychildcharlie
 server/chat-plugins/the-studio.ts @KrisXV
 server/chat-plugins/trivia.ts @AnnikaCodes
 server/modlog.ts @monsanto
+test/random-battles/* @AnnikaCodes

test/random-battles/gen8.js

@@ -0,0 +1,37 @@
+/**
+ * Tests for Gen 8 randomized formats
+ */
+'use strict';
+
+const {testSet} = require('./tools');
+const assert = require('../assert');
+
+describe('[Gen 8] Random Battle', () => {
+	const options = {format: 'gen8randombattle'};
+
+	it('should not generate Golisopod without Bug STAB', () => {
+		testSet('golisopod', options, set => {
+			assert(set.moves.some(m => {
+				const move = Dex.getMove(m);
+				return move.type === 'Bug' && move.category !== 'Status';
+			}), `Golisopod should get Bug STAB (got ${set.moves})`);
+		});
+	});
+});
+
+describe('[Gen 8] Random Doubles Battle', () => {
+	const options = {format: 'gen8randomdoublesbattle'};
+
+	it('should never generate Melmetal without Body Press', () => {
+		testSet('melmetal', options, set => {
+			assert(set.moves.includes('bodypress'), `Melmetal should get Body Press (got ${set.moves})`);
+		});
+	});
+});
+
+describe('[Gen 8] Random Battle (No Dmax)', () => {
+	// No tests here yet!
+	// This format is extremely new; this will be filled in later when I have to fix No Dmax bugs.
+
+	// const options = {format: 'gen8randombattlenodmax', isDynamax: true};
+});

test/random-battles/tools.js

@@ -0,0 +1,44 @@
+/**
+ * Tools for testing Random Battles.
+ *
+ * @author Annika
+ */
+'use strict';
+
+/**
+ * Unit test helper for Pokemon sets
+ *
+ * @param {ID} pokemon the ID of the Pokemon whose set is to be tested
+ * @param {{format?: string, rounds?: number, isDoubles?: boolean, isLead?: boolean, isDynamax?: boolean}} options
+ * @param {(set: RandomTeamsTypes.RandomSet) => void} test a function called on each set
+ */
+function testSet(pokemon, options, test) {
+	const generator = Dex.getTeamGenerator(options.format);
+	const rounds = options.rounds || 1000;
+
+	const isDoubles = options.isDoubles || (options.format && options.format.includes('doubles'));
+	const isDynamax = options.isDynamax || !(options.format && options.format.includes('nodmax'));
+	for (let i = 0; i < rounds; i++) {
+		const set = generator.randomSet(pokemon, {}, options.isLead, isDoubles, isDynamax);
+		test(set);
+	}
+}
+
+/**
+ * Unit test helper for Pokemon teams
+ *
+ * @param {{format?: string, rounds?: number}} options
+ * @param {(team: RandomTeamsTypes.RandomSet[]) => void} test a function called on each team
+ */
+function testTeam(options, test) {
+	const generator = Dex.getTeamGenerator(options.format);
+	const rounds = options.rounds || 1000;
+
+	for (let i = 0; i < rounds; i++) {
+		const team = generator.randomTeam();
+		test(team);
+	}
+}
+
+exports.testSet = testSet;
+exports.testTeam = testTeam;