diff --git a/.gitignore b/.gitignore
index ea70350..0bec46f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 /doc/tags
 /misc
-/test/*.out
+/test/*.actual
diff --git a/test/README.markdown b/test/README.markdown
index d9d6ffd..8938394 100644
--- a/test/README.markdown
+++ b/test/README.markdown
@@ -19,9 +19,9 @@ call Setup()
 ```
 
 - Run the tests.
-- Inspect output from the new test.  If good, copy it to `foo.ok`.
+- Inspect output (in `foo.actual`) from the new test.  If good, copy it to `foo.expected`.
 - Run the tests to ensure new test's output is verified.
-- `rm *.out` and commit changes.
+- Commit changes.
 
 ### Limitations
 
diff --git a/test/addLines.ok b/test/addLines.expected
similarity index 100%
rename from test/addLines.ok
rename to test/addLines.expected
diff --git a/test/helper.vim b/test/helper.vim
index 56929e2..ec23e4d 100644
--- a/test/helper.vim
+++ b/test/helper.vim
@@ -9,11 +9,11 @@ function! Setup()
 endfunction
 
 function! DumpSigns(filename)
-  execute 'redir! > ' a:filename.'.out'
+  execute 'redir! > ' a:filename.'.actual'
     silent execute 'sign place'
   redir END
 endfunction
 
 function! DumpGitDiff(filename)
-  call system('git diff --staged fixture.txt > '.a:filename.'.out')
+  call system('git diff --staged fixture.txt > '.a:filename.'.actual')
 endfunction
diff --git a/test/hunkStageGitDiff.ok b/test/hunkStageGitDiff.expected
similarity index 100%
rename from test/hunkStageGitDiff.ok
rename to test/hunkStageGitDiff.expected
diff --git a/test/hunkStageSigns.ok b/test/hunkStageSigns.expected
similarity index 100%
rename from test/hunkStageSigns.ok
rename to test/hunkStageSigns.expected
diff --git a/test/modifyLines.ok b/test/modifyLines.expected
similarity index 100%
rename from test/modifyLines.ok
rename to test/modifyLines.expected
diff --git a/test/noModifications.ok b/test/noModifications.expected
similarity index 100%
rename from test/noModifications.ok
rename to test/noModifications.expected
diff --git a/test/orphanedSigns.ok b/test/orphanedSigns.expected
similarity index 100%
rename from test/orphanedSigns.ok
rename to test/orphanedSigns.expected
diff --git a/test/removeFirstLines.ok b/test/removeFirstLines.expected
similarity index 100%
rename from test/removeFirstLines.ok
rename to test/removeFirstLines.expected
diff --git a/test/removeLines.ok b/test/removeLines.expected
similarity index 100%
rename from test/removeLines.ok
rename to test/removeLines.expected
diff --git a/test/test.sh b/test/test.sh
index 9496b00..6fbb04a 100755
--- a/test/test.sh
+++ b/test/test.sh
@@ -3,7 +3,8 @@
 # TODO: exit with non-zero status code when tests fail.
 
 
-rm -f *.out
+# Clean up.
+rm -f *.actual
 
 # Execute the tests.
 for testcase in test*.vim; do
@@ -14,9 +15,9 @@ done
 count_ok=0
 count_fail=0
 
-for expected in *.ok; do
+for expected in *.expected; do
   name=${expected%.*}
-  actual=$name.out
+  actual=$name.actual
 
   if diff $expected $actual; then
     count_ok=$((count_ok + 1))
@@ -27,9 +28,12 @@ for expected in *.ok; do
   fi
 done
 
+# Clean up.
 git reset HEAD fixture.txt > /dev/null
 git checkout fixture.txt
+rm -f *.actual
 
+# Print results.
 echo
 echo "$((count_ok + count_fail)) tests"
 echo "$count_ok ok"