Modifying the docker file to install docker on a separate step so we can cache that bit to speed up testing. also adding a script that will run some quick tests

Dockerfile

@@ -1,7 +1,8 @@
 FROM python:3.6.2-slim
-RUN apt-get update && apt-get install -y curl &&\
+RUN apt-get update && apt-get install curl -y &&\
-    pip3 install requests discord.py docker pybooru && \
     curl -Lks get.docker.com | bash
 
+RUN pip install requests discord.py docker pybooru termcolor
+
 ADD app /app
 CMD python app/dragon-bot.py

app/dragon-bot.py

@@ -6,6 +6,7 @@ import help_methods
 import discord
 import docker
 from pybooru import Danbooru
+from termcolor import colored
 
 # Client object
 client = discord.Client()
@@ -260,7 +261,7 @@ async def on_message(message):
 
 # Check if there is a command line argument after script
 if len(sys.argv) > 1:
-    print("If you're seeing this, the python compiled")
+    print(colored("If you're seeing this, the python compiled", 'green'))
     sys.exit()
 
 token = "MzM5NDQ2NTgwMTU3MzQ5ODg4.DFkGYg.z-XD17nFP4rtBq-YsNbOJHuBWfQ"    # get from the bot page. must be a bot, not a discord app

test_container.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+printf "\nStarting tests\n"
+
+printf "Building docker container\n"
+docker build -t tests .
+
+printf "Running docker container to test your python code\n"
+docker run --rm tests python /app/dragon-bot.py test