Add functional tests for resource_id

Signed-off-by: Clinton Wolfe <clintoncwolfe@gmail.com>

test/fixtures/profiles/resource_ids/controls/basic.rb

@@ -0,0 +1,5 @@
+control "basic custom resource" do
+  describe basic do
+    its("resource_id") { should cmp "42" }
+  end
+end

test/fixtures/profiles/resource_ids/inspec.yml

@@ -0,0 +1,10 @@
+name: resource_ids
+title: InSpec Profile
+maintainer: The Authors
+copyright: The Authors
+copyright_email: you@example.com
+license: Apache-2.0
+summary: An InSpec Compliance Profile
+version: 0.1.0
+supports:
+  platform: os

test/fixtures/profiles/resource_ids/libraries/basic_resource.rb

@@ -0,0 +1,7 @@
+class Basic < Inspec.resource(1)
+  name 'basic'
+
+  def resource_id
+    super("42")
+  end
+end

test/functional/inspec_exec_test.rb

@@ -1299,4 +1299,13 @@ EOT
 
     end
   end
+
+  describe "when evalutating profiles that reference resource_id" do
+    let(:run_result) { run_inspec_process("exec #{profile}", json: true) }
+    let(:profile) { "#{profile_path}/resource_ids" } # A profile with custom resources and test controls that exercise resource ids
+    it "should evaluate all test controls correctly" do
+      _(run_result.stderr).must_be_empty
+      assert_json_controls_passing
+    end
+  end
 end