pokemon-showdown/test/simulator/abilities/contrary.js

var assert = require('assert');
var battle;

describe('Contrary', function () {
	afterEach(function () {
		battle.destroy();
	});

	it('should invert relative stat changes', function () {
		this.timeout(0);
		battle = BattleEngine.Battle.construct();
		battle.join('p1', 'Guest 1', 1, [{species: "Spinda", ability: 'contrary', moves: ['superpower']}]);
		battle.join('p2', 'Guest 2', 1, [{species: "Dragonite", ability: 'multiscale',  moves: ['dragondance']}]);
		battle.commitDecisions();
		assert.strictEqual(battle.p1.active[0].boosts['atk'], 1);
		assert.strictEqual(battle.p1.active[0].boosts['def'], 1);
	});

	it('should not invert absolute stat changes', function () {
		battle = BattleEngine.Battle.construct();
		battle.join('p1', 'Guest 1', 1, [{species: "Serperior", ability: 'contrary', moves: ['leechseed']}]);
		battle.join('p2', 'Guest 2', 1, [{species: "Growlithe", ability: 'intimidate', moves: ['topsyturvy']}]);
		battle.commitDecisions();
		assert.strictEqual(battle.p1.active[0].boosts['atk'], -1);
	});

	it('should invert Belly Drum maximizing Attack', function () {
		battle = BattleEngine.Battle.construct();
		battle.join('p1', 'Guest 1', 1, [{species: "Spinda", ability: 'contrary', moves: ['bellydrum']}]);
		battle.join('p2', 'Guest 2', 1, [{species: "Dragonite", ability: 'multiscale',  moves: ['dragondance']}]);
		battle.commitDecisions();
		assert.strictEqual(battle.p1.active[0].boosts['atk'], -6);
	});

	it('should be suppressed by Mold Breaker', function () {
		battle = BattleEngine.Battle.construct();
		battle.join('p1', 'Guest 1', 1, [{species: "Spinda", ability: 'contrary', moves: ['tackle']}]);
		battle.join('p2', 'Guest 2', 1, [{species: "Dragonite", ability: 'moldbreaker',  moves: ['growl']}]);
		battle.commitDecisions();
		assert.strictEqual(battle.p1.active[0].boosts['atk'], -1);
	});
});