upgrade dependencies, including migration to package:test

pubspec.yaml

Index: pubspec.yaml
diff --git a/pubspec.yaml b/pubspec.yaml
index e1ad75e517e016009b3bde01743dbeb075665cd5..b092174dfbacb5953be1f052e8ad8d3cb82f23a0 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -7,15 +7,11 @@ author: Dart Dev Compiler team <dev-compiler@dartlang.org>
 homepage: https://github.com/dart-lang/dev_compiler
 dependencies:
   analyzer: ^0.25.0
-  args: ^0.12.1
+  args: ">=0.12.1 <0.14.0"
   cli_util: ^0.0.1
   crypto: ^0.9.0
-  # We pin a specific version to ensure everyone is formatting the code exactly
-  # the same way. This is because any change in dart_style, even non-breaking
-  # changes, may change the output format.
-  dart_style: 0.1.8
   html: ^0.12.0
-  logging: ^0.9.2
+  logging: ">=0.9.3 <0.12.0"
   path: ^1.3.0
   shelf: ^0.6.0
   shelf_static: ^0.2.1
@@ -24,8 +20,12 @@ dependencies:
   stack_trace: ^1.1.1
   yaml: ^2.1.2
 dev_dependencies:
+  # We pin a specific version to ensure everyone is formatting the code exactly
+  # the same way. This is because any change in dart_style, even non-breaking
+  # changes, may change the output format.
+  dart_style: 0.1.8
   pub_semver: ^1.1.0
-  unittest: ^0.11.0
+  test: ^0.12.0
 environment:
   sdk: ">=1.9.0 <2.0.0"
 executables: