Use pubspec_parse dependency equality (#2254)

Author: nex3

pubspec.yaml

@@ -48,7 +48,7 @@ dev_dependencies:
   lints: ">=2.0.0 <5.0.0"
   protoc_plugin: ">=20.0.0 <22.0.0"
   pub_api_client: ^2.1.1
-  pubspec_parse: ^1.0.0
+  pubspec_parse: ^1.3.0
   test: ^1.16.7
   test_descriptor: ^2.0.0
   test_process: ^2.0.0

test/double_check_test.dart

@@ -116,14 +116,8 @@ void main() {
       });
 
       test("matches dartdoc version", () {
-        // TODO(nweiz): Just use equals() once dart-lang/pubspec_parse#127 lands
-        // and is released.
-        var sassDep = sassPubspec.devDependencies["dartdoc"];
-        var pkgDep = pkgPubspec.devDependencies["dartdoc"];
-        expect(pkgDep, isA<HostedDependency>());
-        expect(sassDep, isA<HostedDependency>());
-        expect((pkgDep as HostedDependency).version,
-            equals((sassDep as HostedDependency).version));
+        expect(sassPubspec.devDependencies["dartdoc"],
+            equals(pkgPubspec.devDependencies["dartdoc"]));
       });
     });
   }