Move pub's web socket API over to use JSON RPC 2.0.

sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_errors_test.dart

Index: sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_errors_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_errors_test.dart b/sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_errors_test.dart
index ac77a1cc443901029bcc155e2355e3605445b74c..14ed26ad9ee8f18d3ec24be70f2a098f7bba9899 100644
--- a/sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_errors_test.dart
+++ b/sdk/lib/_internal/pub/test/serve/web_socket/path_to_urls_errors_test.dart
@@ -4,6 +4,7 @@
 
 library pub_tests;
 
+import 'package:json_rpc_2/error_code.dart' as rpc_error_code;
 import 'package:path/path.dart' as p;
 
 import '../../descriptor.dart' as d;
@@ -38,29 +39,15 @@ main() {
     pubServe(shouldGetFirst: true);
 
     // Bad arguments.
-    expectWebSocketCall({
-      "command": "pathToUrls"
-    }, replyEquals: {
-      "code": "BAD_ARGUMENT",
-      "error": 'Missing "path" argument.'
-    });
+    expectWebSocketError("pathToUrls", {"path": 123},
+        rpc_error_code.INVALID_PARAMS,
+        'Parameter "path" for method "pathToUrls" must be a string, but was '
+            '123.');
 
-    expectWebSocketCall({
-      "command": "pathToUrls",
-      "path": 123
-    }, replyEquals: {
-      "code": "BAD_ARGUMENT",
-      "error": '"path" must be a string. Got 123.'
-    });
-
-    expectWebSocketCall({
-      "command": "pathToUrls",
-      "path": "main.dart",
-      "line": 12.34
-    }, replyEquals: {
-      "code": "BAD_ARGUMENT",
-      "error": '"line" must be an integer. Got 12.34.'
-    });
+    expectWebSocketError("pathToUrls", {"path": "main.dart", "line": 12.34},
+        rpc_error_code.INVALID_PARAMS,
+        'Parameter "line" for method "pathToUrls" must be an integer, but was '
+            '12.34.');
 
     // Unserved directories.
     expectNotServed(p.join('bin', 'foo.txt'));
@@ -73,11 +60,6 @@ main() {
 }
 
 void expectNotServed(String path) {
-  expectWebSocketCall({
-    "command": "pathToUrls",
-    "path": path
-  }, replyEquals: {
-    "code": "NOT_SERVED",
-    "error": 'Asset path "$path" is not currently being served.'
-  });
+  expectWebSocketError("pathToUrls", {"path": path}, NOT_SERVED,
+      'Asset path "$path" is not currently being served.');
 }