message: Explicitly test for new package metadata fields
diff: @@ -968,7 +968,11 @@ fn package_metadata() {
  [package]
  name = "foo"
  version = "0.1.0"
  - authors = []
  + authors = ["wycats@example.com"]
  + categories = ["database"]
  + keywords = ["database"]
  + readme = "README.md"
  + repository = "https://github.com/rust-lang/cargo"
  [package.metadata.bar]
  baz = "quux"
  @@ -984,14 +988,14 @@ fn package_metadata() {
  {
  "packages": [
  {
  - "authors": [],
  - "categories": [],
  + "authors": ["wycats@example.com"],
  + "categories": ["database"],
  "name": "foo",
  - "readme": null,
  - "repository": null,
  + "readme": "README.md",
  + "repository": "https://github.com/rust-lang/cargo",
  "version": "0.1.0",
  "id": "foo[..]",
  - "keywords": [],
  + "keywords": ["database"],
  "source": null,
  "dependencies": [],
  "license": null,
  