Adds user controller tests

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

tests/Core/Controller/UserControllerTest.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace Test\Core\Controller;
+
+use OC\Core\Controller\UserController;
+use OCP\AppFramework\Http\JSONResponse;
+use OCP\IRequest;
+use OCP\IUser;
+use OCP\IUserManager;
+use Test\TestCase;
+
+class UserControllerTest extends TestCase {
+
+	/** @var IUserManager|\PHPUnit_Framework_MockObject_MockObject */
+	private $userManager;
+
+	/** @var UserController */
+	private $controller;
+
+	public function setUp() {
+		parent::setUp();
+
+		$this->userManager = $this->createMock(IUserManager::class);
+		$this->controller = new UserController(
+			'core',
+			$this->createMock(IRequest::class),
+			$this->userManager
+		);
+	}
+
+	public function testGetDisplayNames() {
+		$user = $this->createMock(IUser::class);
+		$user->method('getDisplayName')
+			->willReturn('FooDisplay Name');
+
+		$this->userManager
+			->method('get')
+			->will($this->returnCallback(function ($uid) use ($user) {
+				if ($uid === 'foo') {
+					return $user;
+				}
+				return null;
+			}));
+
+		$expected = new JSONResponse([
+			'users' => [
+				'foo' => 'FooDisplay Name',
+				'bar' => 'bar',
+			],
+			'status' => 'success'
+		]);
+
+		$result = $this->controller->getDisplayNames(['foo', 'bar']);
+		$this->assertEquals($expected, $result);
+	}
+}