Run tests in nvim as well as vim.

test/test

@@ -2,37 +2,49 @@
 
 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 $testcase -c 'quit!'
+
+    git reset HEAD fixture.txt > /dev/null
+    git checkout fixture.txt
+  done
+
+  # Verify the results.
+  echo "$editor:"
+  echo
+
+  count_ok=0
+  count_fail=0
+
+  for expected in *.expected; do
+    name=${expected%.*}
+    actual=$name.actual
+
+    if diff $expected $actual; then
+      count_ok=$((count_ok + 1))
+      echo "$name ok"
+      rm $actual
+    else
+      count_fail=$((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))
 
-  git reset HEAD fixture.txt > /dev/null
-  git checkout fixture.txt
 done
 
-# Verify the results.
-count_ok=0
-count_fail=0
-
-for expected in *.expected; do
-  name=${expected%.*}
-  actual=$name.actual
-
-  if diff $expected $actual; then
-    count_ok=$((count_ok + 1))
-    echo "$name ok"
-    rm $actual
-  else
-    count_fail=$((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"
-
-exit $count_fail
+exit $status