Setup environment to work in Docker container

Fixes AlexUkPC/GildedRose-Refactoring-Kata#1

Dockerfile

@@ -0,0 +1,9 @@
+FROM ruby:2.7
+# define the environment variable install path
+ENV INSTALL_PATH /opt/app/
+# copy files from ruby folder into the container
+COPY ruby/ $INSTALL_PATH
+# install RSpec
+RUN gem install rspec
+# set the working directory
+WORKDIR $INSTALL_PATH

README.md

@@ -1,3 +1,11 @@
+## Commands to run for docker ruby environment 
+
+### Create the image
+>     docker build -t gilded-rose-app .
+### Run the RSpec tests
+>     docker run -it --rm -v ${PWD}/ruby:/opt/app gilded-rose-app rspec .
+### Run the unit tests
+>     docker run -it --rm -v ${PWD}/ruby:/opt/app gilded-rose-app ruby gilded_rose_tests.rb
 # Gilded Rose Refactoring Kata
 
 This Kata was originally created by Terry Hughes (http://twitter.com/TerryHughes). It is already on GitHub [here](https://github.com/NotMyself/GildedRose). See also [Bobby Johnson's description of the kata](http://iamnotmyself.com/2011/02/13/refactor-this-the-gilded-rose-kata/).

ruby/gilded_rose_spec.rb

@@ -6,7 +6,7 @@ describe GildedRose do
     it "does not change the name" do
       items = [Item.new("foo", 0, 0)]
       GildedRose.new(items).update_quality()
-      expect(items[0].name).to eq "fixme"
+      expect(items[0].name).to eq "foo"
     end
   end
 

ruby/gilded_rose_tests.rb

@@ -6,7 +6,7 @@ class TestUntitled < Test::Unit::TestCase
   def test_foo
     items = [Item.new("foo", 0, 0)]
     GildedRose.new(items).update_quality()
-    assert_equal items[0].name, "fixme"
+    assert_equal items[0].name, "foo"
   end
 
 end