You can't use unidiff AFAIK. You must use git diff
diff --git a/test/fixture/test/ci.go b/test/fixture/test/ci.go
index 6829b8a2..4c565f1b 100644
--- a/test/fixture/test/ci.go
+++ b/test/fixture/test/ci.go
[CHANGES GO HERE]
unidiff format:
--- lao 2002-02-21 23:30:39.942229878 -0800
+++ tzu 2002-02-21 23:30:50.442260588 -0800
[CHANGES GO HERE]
You can't use
unidiffAFAIK. You must usegit diffunidiff format: