Test rake build

This task was previously failing because the command `bundle exec heroics-generate` did not load `platform_api.rb` and so it fails when a constant is referenced. This commit adds a spec to make sure this behavior doesn't fail.

Author: schneems

config/client-config.rb

@@ -2,7 +2,7 @@
 require 'heroics'
 require 'rate_throttle_client'
 
-require File.join(File.expand_path('../..', __FILE__), 'lib', 'platform-api', 'version.rb')
+require File.join(File.expand_path('../..', __FILE__), 'lib', 'platform-api')
 
 Heroics.default_configuration do |config|
   config.base_url = 'https://api.heroku.com'

lib/platform-api/version.rb

@@ -1,3 +1,3 @@
 module PlatformAPI
-  VERSION = '2.3.0'
+  VERSION = '2.3.0.pre.1'
 end

platform-api.gemspec

@@ -15,8 +15,9 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/heroku/platform-api'
   spec.license       = 'MIT'
 
-  spec.files         = `git ls-files`.split($/)
-  spec.test_files    = spec.files.grep('^(test|spec|features)/')
+  spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
+    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  end
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler'

spec/acceptance/build_client_spec.rb

@@ -0,0 +1,18 @@
+describe 'Generating a client' do
+  it "works" do
+    base_dir = Pathname.new(__dir__).join("../..")
+    Dir.mktmpdir do |tmpdir|
+      FileUtils.copy_entry(base_dir, tmpdir)
+      Dir.chdir(tmpdir) do
+        schema_mtime = File.mtime("schema.json")
+        client_rb_mtime = File.mtime("lib/platform-api/client.rb")
+
+        out = `rake build 2>&1`
+        raise "Expected `rake build` to succeed but it did not:\n#{out}" unless $?.success?
+
+        expect(schema_mtime).to_not eq(File.mtime("schema.json"))
+        expect(client_rb_mtime).to_not eq(File.mtime("lib/platform-api/client.rb"))
+      end
+    end
+  end
+end