Unit test clients (#203)

* Adding unit tests for clients.

This will make sure the input and the output is correct.

* Make sure the response is not resolved

* Updated to core2

Author: Nyholm

Tests/Unit/StsClientTest.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace AsyncAws\Core\Tests\Unit;
+
+use AsyncAws\Core\Credentials\NullProvider;
+use AsyncAws\Core\Sts\Input\AssumeRoleRequest;
+use AsyncAws\Core\Sts\Input\GetCallerIdentityRequest;
+use AsyncAws\Core\Sts\Result\AssumeRoleResponse;
+use AsyncAws\Core\Sts\Result\GetCallerIdentityResponse;
+use AsyncAws\Core\Sts\StsClient;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpClient\MockHttpClient;
+
+class StsClientTest extends TestCase
+{
+    public function testAssumeRole(): void
+    {
+        $client = new StsClient([], new NullProvider(), new MockHttpClient());
+
+        $input = new AssumeRoleRequest([
+            'RoleArn' => 'change me',
+            'RoleSessionName' => 'change me',
+
+        ]);
+        $result = $client->AssumeRole($input);
+
+        self::assertInstanceOf(AssumeRoleResponse::class, $result);
+        self::assertFalse($result->info()['resolved']);
+    }
+
+    public function testGetCallerIdentity(): void
+    {
+        $client = new StsClient([], new NullProvider(), new MockHttpClient());
+
+        $input = new GetCallerIdentityRequest([
+
+        ]);
+        $result = $client->GetCallerIdentity($input);
+
+        self::assertInstanceOf(GetCallerIdentityResponse::class, $result);
+        self::assertFalse($result->info()['resolved']);
+    }
+}