Set up Aruba environment properly in 'uses aruba API' shared context

spec/support/shared_contexts/aruba.rb

@@ -17,7 +17,7 @@ def create_test_files(files, data = "a")
     end
   end
 
-  before do
+  around do |example|
     klass = Class.new do
       include Aruba::Api
 
@@ -36,5 +36,12 @@ def set_tag(tag_name, value)
     if @aruba.aruba.current_directory[0] == "/"
       raise "We must work with relative paths, everything else is dangerous"
     end
+
+    # Use configured home directory as HOME
+    @aruba.set_environment_variable "HOME", aruba.config.home_directory
+
+    @aruba.with_environment do
+      example.run
+    end
   end
 end