Add test for the multi buildpack, courtesy of https://github.com/AlJohri

tests/apps/multi/.bowerrc

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+{
+  "directory": "static/components"
+}

tests/apps/multi/.buildpacks

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+https://github.com/heroku/heroku-buildpack-ruby
+https://github.com/heroku/heroku-buildpack-nodejs
+https://github.com/heroku/heroku-buildpack-python

tests/apps/multi/.gitignore

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+node_modules
+static/components
+static/.tmp
+.sass-cache
+.bundle
+.DS_Store

tests/apps/multi/.npmrc

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+unsafe-perm = true

tests/apps/multi/Gemfile

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+source "https://rubygems.org"
+
+ruby '1.9.3'
+
+gem 'compass'
+gem 'sass-globbing'

tests/apps/multi/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    chunky_png (1.3.0)
+    compass (0.12.3)
+      chunky_png (~> 1.2)
+      fssm (>= 0.2.7)
+      sass (= 3.2.14)
+    fssm (0.2.10)
+    sass (3.2.14)
+    sass-globbing (1.1.0)
+      sass (>= 3.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  compass
+  sass-globbing

tests/apps/multi/Gruntfile.js

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+'use strict';
+
+module.exports = function (grunt) {
+
+  require('load-grunt-tasks')(grunt);
+
+  grunt.initConfig({
+
+    compass: {
+      options: {
+        sassDir: 'static/styles',
+        cssDir: 'static/.tmp/styles',
+        generatedImagesDir: 'static/.tmp/images/generated',
+        imagesDir: 'static/images',
+        javascriptsDir: 'static/scripts',
+        fontsDir: 'static/styles/fonts',
+        importPath: 'static/components',
+        httpImagesPath: '/images',
+        httpGeneratedImagesPath: '/images/generated',
+        httpFontsPath: '/styles/fonts',
+        relativeAssets: false,
+        assetCacheBuster: false,
+        bundleExec: true,
+        raw: 'Sass::Script::Number.precision = 10\n'
+      },
+      dist: {
+        options: {
+          // generatedImagesDir: '<%= yeoman.dist %>/static/images/generated'
+        }
+      },
+      server: {
+        options: {
+          debugInfo: false
+        }
+      }
+    }
+  });
+
+  grunt.registerTask('heroku', [
+    'compass:server'
+  ]);
+
+};

tests/apps/multi/Procfile

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+web: python app.py

tests/apps/multi/README.md

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+This is a sample application to test heroku buildpack multi for integrating with buildstep: https://github.com/progrium/buildstep/pull/75
+
+I am choosing to use the python, nodejs, and ruby buildpacks to create a very simple flask app that performs a bower install and a simple grunt task using compass.

tests/apps/multi/app.py

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+import os
+from flask import Flask, render_template
+from werkzeug.wsgi import SharedDataMiddleware
+
+app = Flask(__name__)
+
+@app.route('/')
+def hello_world():
+    return render_template('index.html')
+
+app.wsgi_app = SharedDataMiddleware(app.wsgi_app, { '/': os.path.join(os.path.dirname(__file__), 'static') })
+app.wsgi_app = SharedDataMiddleware(app.wsgi_app, { '/': os.path.join(os.path.dirname(__file__), 'static/.tmp') })
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', debug=True)

tests/apps/multi/bower.json

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+{
+  "name": "test-buildpack-multi",
+  "version": "0.0.0",
+  "authors": [
+    "Al Johri <al.johri@gmail.com>"
+  ],
+  "license": "MIT",
+  "private": true,
+  "directory": "static/components",
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "statc/components",
+    "test",
+    "tests"
+  ],
+  "dependencies": {
+    "bootstrap-sass": "twbs/bootstrap-sass#~3.1.1"
+  }
+}

tests/apps/multi/check_deploy

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+#!/bin/bash
+set -e; curl -s $1 | grep -q "Heroku Multi Buildpack on Dokku"

tests/apps/multi/package.json

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+{
+  "name": "test-buildpack-multi",
+  "version": "0.0.0",
+  "description": "Test application for heroku multi buildpack.",
+  "author": "Al Johri",
+  "license": "ISC",
+  "dependencies": {
+    "bower": "~1.2.8",
+    "grunt": "~0.4.1",
+    "grunt-cli": "~0.1.13",
+    "load-grunt-tasks": "~0.2.0",
+    "grunt-contrib-compass": "~0.6.0"
+  },
+  "scripts": {
+    "postinstall": "./node_modules/bower/bin/bower --allow-root install && ./node_modules/grunt-cli/bin/grunt heroku"
+  }
+}

tests/apps/multi/requirements.txt

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+Flask==0.10.1

tests/apps/multi/static/styles/main.scss

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+// override scss variables within bootsrap by delaring them
+// before importing bootstrap
+
+$brand-primary:         #428bca !default;
+
+@import "bootstrap-sass/vendor/assets/stylesheets/bootstrap";

tests/apps/multi/templates/index.html

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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="utf-8">
+  <title>Sample Webpage</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta name="description" content="">
+  <meta name="author" content="">	
+  <link rel="stylesheet" type="text/css" href="/styles/main.css">
+  <script type="text/javascript" src="/components/bootstap-sass/vendor/assets/javascripts/bootstrap/bootstrap.js"></script>
+</head>
+
+<body>
+	<div class="container">
+		<div class="row clearfix">
+			<div class="col-md-12 column">
+				<div class="jumbotron">
+					<h1>
+						Hello, world!
+					</h1>
+					<p>
+						This is a sample website using the Heroku Multi Buildpack on Dokku. It uses the python, ruby, and node buildpacks. The node buildpack is for using bower and grunt. The ruby buildpack is for running compass. And last but not last, the python buildpack is to run the flask application.
+					</p>
+					<p>
+						<a class="btn btn-primary btn-large" href="#">Learn more</a>
+					</p>
+				</div>
+			</div>
+		</div>
+	</div>
+</body>
+
+</html>