diff --git a/README.md b/README.md
index f4e90b5..c12bb6e 100644
--- a/README.md
+++ b/README.md
@@ -77,3 +77,9 @@ echo('<pre>' . json_encode($t, JSON_PRETTY_PRINT) . '</pre>');
 
 ?>
 ```
+
+# Running the Tests
+
+Update the `tests/phpunit.xml` set the <env> `SANDBOX_USERNAME` and the `SANDBOX_PASSWORD` to your username and password.
+
+You can then run the tests using phpunit with the following command: `phpunit -c tests/phpunit.xml`
diff --git a/composer.json b/composer.json
index 2ffc646..64484cd 100644
--- a/composer.json
+++ b/composer.json
@@ -37,7 +37,7 @@
     "type": "library",
     "require": {
         "php": ">=5.5.9",
-        "guzzlehttp/guzzle": "~6"
+        "guzzlehttp/guzzle": "~7"
     },
     "require-dev": {
         "phpunit/phpunit": "5.7"
diff --git a/tests/basicWorkflowTest.php b/tests/basicWorkflowTest.php
index 63391fb..84314d4 100644
--- a/tests/basicWorkflowTest.php
+++ b/tests/basicWorkflowTest.php
@@ -12,6 +12,8 @@ final class AvaTaxClientTest extends TestCase
      */
     public function testConstructorThrowsExceptionForMissingRequirements()
     {
+        $this->expectException('Exception');
+
         new Avalara\AvaTaxClient('', '', '', '');
     }
     
diff --git a/tests/phpunit.xml b/tests/phpunit.xml
index 1b42d14..a441d21 100644
--- a/tests/phpunit.xml
+++ b/tests/phpunit.xml
@@ -2,4 +2,8 @@
     <testsuite name="AvaTaxClient">
         <directory>./</directory>
     </testsuite>
-</phpunit>
\ No newline at end of file
+    <php>
+        <env name="SANDBOX_USERNAME" value="CHANGE_ME" force="true" />
+        <env name="SANDBOX_PASSWORD" value="CHANGE_ME" force="true" />
+    </php>
+</phpunit>