Add testing flexibility

Prior to this commit all bolt tests had to be run in order to check a small change.  This commit allow individual tests to be re-run to shorten the dev iteration cycle.

Signed-off-by: Gavin Didrichsen <[email protected]>

rakelib/tests.rake

@@ -15,7 +15,14 @@ begin
 
     desc "Run RSpec tests that do not require VM fixtures or a particular shell"
     RSpec::Core::RakeTask.new(:unit) do |t|
-      t.pattern = "spec/unit/**/*_spec.rb"
+      if ENV['TEST']
+        t.pattern = "spec/unit/**/*_spec.rb"
+        t.rspec_opts = "-e '#{ENV['TEST']}'"
+      elsif ENV['FILE']
+        t.pattern = ENV['FILE']
+      else
+        t.pattern = "spec/unit/**/*_spec.rb"
+      end
     end
 
     desc 'Run tests that require a host System Under Test configured with WinRM'