add basic class instanciation tests

.gitignore

-vendor
+phpunit.xml
+composer.lock
+composer.phar
+vendor
\ No newline at end of file

phpunit.xml.dist

+<?xml version="1.0" encoding="UTF-8"?>
+
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+         syntaxCheck="false"
+         bootstrap="test/bootstrap.php"
+>
+    <testsuites>
+        <testsuite name="php-redmine-api Test Suite">
+            <directory>./test/Redmine/</directory>
+        </testsuite>
+    </testsuites>
+
+    <groups>
+        <exclude>
+            <group>functional</group>
+        </exclude>
+    </groups>
+
+    <filter>
+        <whitelist>
+            <directory suffix=".php">./lib/Redmine/</directory>
+        </whitelist>
+    </filter>
+</phpunit>

test/Redmine/Tests/ClientTest.php

+<?php
+
+namespace Redmine\Tests;
+
+use Redmine\Client;
+use Redmine\Exception\InvalidArgumentException;
+
+class ClientTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @test
+     */
+    public function shouldPassApiKeyToContructor()
+    {
+        $client = new Client('http://test.local', 'asdf');
+
+        $this->assertInstanceOf('Redmine\Client', $client);
+    }
+
+    /**
+     * @test
+     */
+    public function shouldPassUsernameAndPasswordToContructor()
+    {
+        $client = new Client('http://test.local', 'username', 'pwd');
+
+        $this->assertInstanceOf('Redmine\Client', $client);
+    }
+
+    /**
+     * @test
+     * @expectedException InvalidArgumentException
+     */
+    public function shouldNotGetApiInstance()
+    {
+        $client = new Client('http://test.local', 'asdf');
+        $client->api('do_not_exist');
+    }
+
+    /**
+     * @test
+     * @dataProvider getApiClassesProvider
+     */
+    public function shouldGetApiInstance($apiName, $class)
+    {
+        $client = new Client('http://test.local', 'asdf');
+        $this->assertInstanceOf($class, $client->api($apiName));
+    }
+
+    public function getApiClassesProvider()
+    {
+        return array(
+            array('attachment', 'Redmine\Api\Attachment'),
+            array('group', 'Redmine\Api\Group'),
+            array('custom_fields', 'Redmine\Api\CustomField'),
+            array('issue', 'Redmine\Api\Issue'),
+            array('issue_category', 'Redmine\Api\IssueCategory'),
+            array('issue_priority', 'Redmine\Api\IssuePriority'),
+            array('issue_relation', 'Redmine\Api\IssueRelation'),
+            array('issue_status', 'Redmine\Api\IssueStatus'),
+            array('membership', 'Redmine\Api\Membership'),
+            array('news', 'Redmine\Api\News'),
+            array('project', 'Redmine\Api\Project'),
+            array('query', 'Redmine\Api\Query'),
+            array('role', 'Redmine\Api\Role'),
+            array('time_entry', 'Redmine\Api\TimeEntry'),
+            array('time_entry_activity', 'Redmine\Api\TimeEntryActivity'),
+            array('tracker', 'Redmine\Api\Tracker'),
+            array('user', 'Redmine\Api\User'),
+            array('version', 'Redmine\Api\Version'),
+            array('wiki', 'Redmine\Api\Wiki'),
+        );
+    }
+}

test/bootstrap.php

+<?php
+
+function includeIfExists($file)
+{
+    if (file_exists($file)) {
+        return include $file;
+    }
+}
+
+if ((!$loader = includeIfExists(__DIR__.'/../vendor/autoload.php')) && (!$loader = includeIfExists(__DIR__.'/../../../.composer/autoload.php'))) {
+    die('You must set up the project dependencies, run the following commands:'.PHP_EOL.
+        'curl -s http://getcomposer.org/installer | php'.PHP_EOL.
+        'php composer.phar install'.PHP_EOL);
+}
+
+$loader->add('Redmine\Tests', __DIR__);
+
+return $loader;