Update Docker instructions

Dockerfile

@@ -1,5 +1,8 @@
 FROM php:7.1-apache
 
+ARG sendgrid_apikey
+ENV SENDGRID_API_KEY=$sendgrid_apikey
+
 COPY . /var/www/client
 WORKDIR /var/www/client
 

README.md

@@ -65,7 +65,6 @@ $ cd /path/to/your/app
 $ mkdir lib
 $ cd lib
 $ git clone https://github.com/sendgrid/php-http-client.git
-$ git clone https://github.com/sendgrid/sendgrid-php.git
 ```
 
 In the next step you should create `loader.php`:
@@ -82,8 +81,6 @@ And add to `loader.php` code below:
 
 require_once __DIR__ . '/lib/php-http-client/lib/Client.php';
 require_once __DIR__ . '/lib/php-http-client/lib/Response.php';
-require_once __DIR__ . '/lib/sendgrid-php/lib/SendGrid.php';
-
 ```
 
 After it you can use `php-http-client` library in your project:

USE_CASES.md

@@ -0,0 +1,27 @@
+This documentation provides examples for specific use cases. Please [open an issue](https://github.com/sendgrid/php-http-client/issues) or make a pull request for any use cases you would like us to document here. Thank you!
+
+# Table of Contents
+* [Docker](#docker)
+
+<a name="docker"></a>
+# Docker
+
+You can run the example code at `examples/example.php` in a Docker container.
+
+From the root directory:
+
+```bash
+cp examples/.env_sample .env
+```
+
+Update the `.env` file with your SendGrid API Key. If you don't have one, you can get one [here](https://sendgrid.com/free?source=php-http-client).
+
+Add the `.env` file to your `.gitignore` file if you are publishing your code publically.
+
+```
+source .env
+docker build --build-arg sendgrid_apikey=$SENDGRID_API_KEY -t client .
+docker run client php examples/example.php
+```
+
+You should see a list of your SendGrid API Keys.

examples/example.php

@@ -4,6 +4,7 @@
 // comment out the two includes below
 // require __DIR__ . '/vendor/autoload.php';
 include(dirname(__DIR__) . '/lib/Client.php');
+include(dirname(__DIR__) . '/lib/Response.php');
 // This gets the parent directory, for your current directory use getcwd()
 $path_to_config = dirname(__DIR__);
 $apiKey = getenv('SENDGRID_API_KEY');

test/unit/FilesExistTest.php

@@ -15,6 +15,7 @@ public function testFileArePresentInRepo()
         $this->assertFileExists("$rootDir/CHANGELOG.md");
         $this->assertFileExists("$rootDir/CODE_OF_CONDUCT.md");
         $this->assertFileExists("$rootDir/CONTRIBUTING.md");
+        $this->assertFileExists("$rootDir/Dockerfile");
         $this->assertFileExists("$rootDir/.github/ISSUE_TEMPLATE");
         $this->assertFileExists("$rootDir/LICENSE.txt");
         $this->assertFileExists("$rootDir/.github/PULL_REQUEST_TEMPLATE");
@@ -25,9 +26,6 @@ public function testFileArePresentInRepo()
 
         #$composeExists = file_exists('./docker-compose.yml') || file_exists('./docker/docker-compose.yml');
         #$this->assertTrue($composeExists);
-
-        #$dockerExists = file_exists('./Docker') || file_exists('./docker/Docker');
-        #$this->assertTrue($dockerExists);
     }
 }