diff --git a/test/helper.vim b/test/helper.vim
index c633c4a..56929e2 100644
--- a/test/helper.vim
+++ b/test/helper.vim
@@ -2,6 +2,7 @@ set runtimepath+=../
 source ../plugin/gitgutter.vim
 
 function! Setup()
+  call system('git reset HEAD fixture.txt')
   call system('git checkout fixture.txt')
   edit! fixture.txt
   sign unplace *
@@ -13,3 +14,6 @@ function! DumpSigns(filename)
   redir END
 endfunction
 
+function! DumpGitDiff(filename)
+  call system('git diff --staged fixture.txt > '.a:filename.'.out')
+endfunction
diff --git a/test/hunkStageGitDiff.ok b/test/hunkStageGitDiff.ok
new file mode 100644
index 0000000..6f6a7fa
--- /dev/null
+++ b/test/hunkStageGitDiff.ok
@@ -0,0 +1,13 @@
+diff --git a/test/fixture.txt b/test/fixture.txt
+index f5c6aff..ae8e546 100644
+--- a/test/fixture.txt
++++ b/test/fixture.txt
+@@ -2,7 +2,7 @@ a
+ b
+ c
+ d
+-e
++*e
+ f
+ g
+ h
diff --git a/test/hunkStageSigns.ok b/test/hunkStageSigns.ok
new file mode 100644
index 0000000..aa8cd86
--- /dev/null
+++ b/test/hunkStageSigns.ok
@@ -0,0 +1,2 @@
+
+--- Signs ---
diff --git a/test/testHunkStage.vim b/test/testHunkStage.vim
new file mode 100644
index 0000000..8bd84b5
--- /dev/null
+++ b/test/testHunkStage.vim
@@ -0,0 +1,7 @@
+source helper.vim
+call Setup()
+
+normal 5Gi*
+execute 'GitGutterStageHunk'
+call DumpSigns('hunkStageSigns')
+call DumpGitDiff('hunkStageGitDiff')