diff --git a/pubspec.lock b/pubspec.lock
index 1c40f3a5..c14f6fa4 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1,6 +1,20 @@
 # Generated by pub
 # See https://www.dartlang.org/tools/pub/glossary#lockfile
 packages:
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.34.1"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.5.1"
   async:
     dependency: transitive
     description:
@@ -43,6 +57,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.6"
+  csslib:
+    dependency: transitive
+    description:
+      name: csslib
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.14.6"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -53,6 +74,27 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  front_end:
+    dependency: transitive
+    description:
+      name: front_end
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.8"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.7"
+  html:
+    dependency: transitive
+    description:
+      name: html
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.13.3+3"
   http:
     dependency: "direct main"
     description:
@@ -60,6 +102,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.11.3+17"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.5"
   http_parser:
     dependency: transitive
     description:
@@ -74,6 +123,41 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.15.7"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.3"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.6.1+1"
+  json_rpc_2:
+    dependency: transitive
+    description:
+      name: json_rpc_2
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.9"
+  kernel:
+    dependency: transitive
+    description:
+      name: kernel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.8"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.11.3+2"
   matcher:
     dependency: transitive
     description:
@@ -88,6 +172,41 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.6"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.9.6+2"
+  multi_server_socket:
+    dependency: transitive
+    description:
+      name: multi_server_socket
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.2"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.4.4"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.5"
+  package_resolver:
+    dependency: transitive
+    description:
+      name: package_resolver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.6"
   path:
     dependency: "direct main"
     description:
@@ -102,6 +221,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.4.1"
+  plugin:
+    dependency: transitive
+    description:
+      name: plugin
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.0+3"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.3.6"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.4.2"
   quiver:
     dependency: transitive
     description:
@@ -109,11 +249,53 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.1"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.7.4"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.4"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.8"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.2+4"
   sky_engine:
     dependency: transitive
     description: flutter
     source: sdk
     version: "0.0.99"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.5"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.10.8"
   source_span:
     dependency: transitive
     description:
@@ -149,6 +331,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.1"
+  test:
+    dependency: "direct dev"
+    description:
+      name: test
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.5.1+1"
   test_api:
     dependency: transitive
     description:
@@ -156,6 +345,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.2.1"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.0+1"
   typed_data:
     dependency: transitive
     description:
@@ -163,6 +359,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.6"
+  utf:
+    dependency: transitive
+    description:
+      name: utf
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.9.0+5"
   uuid:
     dependency: "direct main"
     description:
@@ -177,6 +380,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.8"
+  vm_service_client:
+    dependency: transitive
+    description:
+      name: vm_service_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.6"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.9.7+10"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.9"
   yaml:
     dependency: "direct main"
     description:
@@ -185,5 +409,5 @@ packages:
     source: hosted
     version: "2.1.15"
 sdks:
-  dart: ">=2.0.0 <3.0.0"
+  dart: ">=2.1.0-dev.5.0 <3.0.0"
   flutter: ">=0.1.4 <2.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 0c664b4b..efbc776b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -12,6 +12,7 @@ dependencies:
   yaml: "^2.1.13"
 
 dev_dependencies:
+  test: ^1.5.1
   flutter_test:
     sdk: flutter
 
diff --git a/test/serializers_test.dart b/test/serializers_test.dart
index 3e4e5ebc..28922554 100644
--- a/test/serializers_test.dart
+++ b/test/serializers_test.dart
@@ -1,5 +1,3 @@
-import 'dart:io';
-
 import 'package:journal/note.dart';
 import 'package:journal/storage/serializers.dart';