Removing the need to supply credentials using envvars for unit tests

Added default credentials to phpunit.xml.dist and configured a couple S3
tests to create clients specific to the test rather than rely on global state.

.travis.yml

@@ -12,7 +12,7 @@ before_script:
   - composer self-update
   - composer install --no-interaction --prefer-source --dev
 
-script: AWS_ACCESS_KEY_ID=foo AWS_SECRET_ACCESS_KEY=bar vendor/bin/phpunit
+script: vendor/bin/phpunit
 
 matrix:
   allow_failures:

phpunit.xml.dist

@@ -2,6 +2,12 @@
 <phpunit bootstrap="./tests/bootstrap.php"
          colors="true">
 
+    <!-- Dummy values used to provide credentials. No need to change these. -->
+    <php>
+        <server name="AWS_ACCESS_KEY_ID" value="foo" />
+        <server name="AWS_ACCESS_KEY_ID" value="bar" />
+    </php>
+
     <testsuites>
         <testsuite name="Aws">
             <directory>tests/Aws/Tests</directory>

tests/Aws/Tests/S3/S3ClientTest.php

@@ -81,8 +81,11 @@ public function testFactoryInitializesClient()
      */
     public function testCreatesPresignedUrls()
     {
-        /** @var $client S3Client */
-        $client = $this->getServiceBuilder()->get('s3', true);
+        $client = S3Client::factory([
+            'region' => 'us-east-1',
+            'key'    => 'foo',
+            'secret' => 'bar'
+        ]);
         $request = $client->get('/foobar');
         $original = (string) $request;
         $url = $client->createPresignedUrl($request, 1342138769);
@@ -97,8 +100,11 @@ public function testCreatesPresignedUrls()
      */
     public function testCreatesPresignedUrlsWithSpecialCharacters()
     {
-        /** @var $client S3Client */
-        $client = $this->getServiceBuilder()->get('s3', true);
+        $client = S3Client::factory([
+            'region' => 'us-east-1',
+            'key'    => 'foo',
+            'secret' => 'bar'
+        ]);
         $request = $client->get('/foobar test: abc/+%.a');
         $url = $client->createPresignedUrl($request, 1342138769);
         $this->assertContains('https://s3.amazonaws.com/foobar%20test%3A%20abc/%2B%25.a?AWSAccessKeyId=', $url);