add back diffing against no file for why-run mode

1 files changed, 4 insertions, 4 deletions

diff --git a/spec/unit/util/diff_spec.rb b/spec/unit/util/diff_spec.rb
index a856902c9b..4cc72c0006 100644
--- a/spec/unit/util/diff_spec.rb
+++ b/spec/unit/util/diff_spec.rb
@@ -44,16 +44,16 @@ describe Chef::Util::Diff, :uses_diff => true do
     expect(differ).to be_a_kind_of(Chef::Util::Diff)
   end
 
-  it "should raise an exception if the old_file does not exist" do
+  it "produces a diff even if the old_file does not exist" do
     old_tempfile.close
     old_tempfile.unlink
-    expect { differ.diff(old_file, new_file) }.to raise_error
+    expect(differ.for_output).to eql(["(no diff)"])
   end
 
-  it "should raise an exception if the new_file does not exist" do
+  it "produces a diff even if the new_file does not exist" do
     new_tempfile.close
     new_tempfile.unlink
-    expect { differ.diff(old_file, new_file) }.to raise_error
+    expect(differ.for_output).to eql(["(no diff)"])
   end
 
   describe "when the two files exist with no content" do