Run tests in nvim as well as vim.

test/test

@@ -2,19 +2,26 @@
 
 VIM="/Applications/MacVim.app/Contents/MacOS/Vim -v"
 
+status=0
+
 # Execute the tests.
-for testcase in test*.vim; do
-  $VIM -N -u NONE --cmd 'let g:gitgutter_async=0' -S $testcase -c 'quit!'
+for editor in "$VIM" nvim; do
+
+  for testcase in test*.vim; do
+    $editor -N -u NONE --cmd 'let g:gitgutter_async=0' -S $testcase -c 'quit!'
 
     git reset HEAD fixture.txt > /dev/null
     git checkout fixture.txt
-done
+  done
 
-# Verify the results.
-count_ok=0
-count_fail=0
+  # Verify the results.
+  echo "$editor:"
+  echo
 
-for expected in *.expected; do
+  count_ok=0
+  count_fail=0
+
+  for expected in *.expected; do
     name=${expected%.*}
     actual=$name.actual
 
@@ -26,13 +33,18 @@ for expected in *.expected; do
       count_fail=$((count_fail + 1))
       echo "$name failed"
     fi
+  done
+
+  # Print results.
+  echo
+  echo "$((count_ok + count_fail)) tests"
+  echo "$count_ok ok"
+  echo "$count_fail failed"
+  echo
+
+  status=$(($status + $count_fail))
+
 done
 
-# Print results.
-echo
-echo "$((count_ok + count_fail)) tests"
-echo "$count_ok ok"
-echo "$count_fail failed"
-
-exit $count_fail
+exit $status