tests don't write to spec/unit

spec/test_helpers.rb

@@ -16,6 +16,7 @@
 #
 
 require 'fileutils'
+require 'tmpdir'
 
 module TestHelpers
 
@@ -48,9 +49,11 @@ def reset_tempdir
 
   def clear_tempdir
     FileUtils.rm_rf(tempdir)
+    @tmpdir = nil
   end
 
   def tempdir
-    File.join(project_root, "spec/unit/specs-tmpdir" )
+    @tmpdir ||= Dir.mktmpdir("chef-dk")
+    File.realpath(@tmpdir)
   end
 end

spec/unit/command/generator_commands_spec.rb

@@ -225,6 +225,7 @@ def generator_context
 
   before do
     ChefDK::Generator.reset
+    reset_tempdir
   end
 
   context "when argv is empty" do
@@ -243,7 +244,6 @@ def generator_context
     let(:argv) { [ new_file_name ] }
 
     before do
-      reset_tempdir
       FileUtils.cp_r(File.join(fixtures_path, "example_cookbook"), tempdir)
     end
 
@@ -288,6 +288,10 @@ def generator_context
     context "and path to the cookbook is given in the argv" do
       let(:argv) { [cookbook_path, new_file_name ] }
 
+      before do
+        FileUtils.cp_r(File.join(fixtures_path, "example_cookbook"), tempdir)
+      end
+
       it "configures the generator context" do
         recipe_generator.read_and_validate_params
         recipe_generator.setup_context