add rspec-guard to run specs automatically (#163)

* add rspec-guard

* update gruard dependency

* modify Guard file and rename category spec

* split index to many for guard to run properly

* change folder name

* improve coverage

* split wrapper spec files for guard to run

* add files

* organize plotting spec files

* update readme regarding testing with guard

* update contributing

CONTRIBUTING.md

@@ -25,6 +25,17 @@ While preparing your pull requests, don't forget to check your code with Rubocop
 
   `bundle exec rubocop`
 
+
+## Testing
+
+Daru has automatic testing with Guard. Just execute the following code before you start editting a file and any change you make will trigger the appropriate tests-
+
+```
+guard rspec
+```
+
+**NOTE**: Please make sure that you place test for your file at the same level and with same itermediatary directories. For example if code file lies in `lib/xyz/abc.rb` then its corresponding test should lie in `spec/xyz/abc_spec.rb`. This is to ensure correct working of Guard.
+
 ## Daru internals
 
 To get an overview of certain internals of daru and their implementation, go over [this blog post](http://v0dro.github.io/blog/2015/08/16/elaboration-on-certain-internals-of-daru/).

Guardfile

@@ -0,0 +1,7 @@
+guard :rspec, cmd: 'rspec' do
+  watch(%r{^spec/.+_spec\.rb$})
+  watch(%r{^lib/daru/(.+)\.rb$})     { |m| "spec/#{m[1]}_spec.rb" }
+  watch('spec/spec_helper.rb')  { "spec" }
+end
+
+# TODO: Run Rubocop in the background

daru.gemspec

@@ -75,4 +75,7 @@ EOF
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'nokogiri'
   spec.add_development_dependency 'gruff'
+  if RUBY_VERSION >= '2.2.5'
+    spec.add_development_dependency 'guard-rspec'
+  end
 end

lib/daru.rb

@@ -98,8 +98,11 @@ def plotting_library= lib
 
 require 'daru/version.rb'
 
+require 'daru/index/index.rb'
+require 'daru/index/multi_index.rb'
+require 'daru/index/categorical_index.rb'
+
 require 'daru/helpers/array.rb'
-require 'daru/index.rb'
 require 'daru/vector.rb'
 require 'daru/dataframe.rb'
 require 'daru/monkeys.rb'