Multiple CLI projects, also using flags

What do I know about Facter? This test fails because once the fact is
set, it's set. Maybe I could do something with weights in the code, but
that seems silly. Probably should instead be testing this differently.

test/boxen_runner_test.rb

@@ -156,7 +156,22 @@ class BoxenRunnerTest < Boxen::Test
 
     runner = Boxen::Runner.new(@config, flags)
     runner.process
-
     assert_equal project, Facter.value(fact)
+
+
+    project = 'other_project'
+    flags   = Boxen::Flags.new('--debug', project)
+
+    runner = Boxen::Runner.new(@config, flags)
+    runner.process
+    assert_equal project, Facter.value(fact)
+
+
+    projects = %w[my cool projects]
+    flags    = Boxen::Flags.new('--noop', *projects)
+
+    runner = Boxen::Runner.new(@config, flags)
+    runner.process
+    assert_equal projects.join(','), Facter.value(fact)
   end
 end