Get codebase ready for actually supporting versioning.

utils/tests/pub/test_pub.dart

Index: utils/tests/pub/test_pub.dart
diff --git a/utils/tests/pub/test_pub.dart b/utils/tests/pub/test_pub.dart
index 702aa04b4094d56b3243b612da8a98d6c4981257..fdd49247418b05baab09c439846234aae75e1fcb 100644
--- a/utils/tests/pub/test_pub.dart
+++ b/utils/tests/pub/test_pub.dart
@@ -108,8 +108,6 @@ void runPub([List<String> args, Pattern output, int exitCode = 0]) {
 
     return _runPub(args, pathInSandbox(appPath));
   }).chain((result) {
-    _validateOutput(output, result.stdout);
-
     Expect.equals(result.stderr.length, 0,
         'Did not expect any output on stderr, and got:\n' +
         Strings.join(result.stderr, '\n'));
@@ -117,6 +115,8 @@ void runPub([List<String> args, Pattern output, int exitCode = 0]) {
     Expect.equals(result.exitCode, exitCode,
         'Pub returned exit code ${result.exitCode}, expected $exitCode.');
 
+    _validateOutput(output, result.stdout);
+
     return _runScheduled(createdSandboxDir, _scheduledAfterPub);
   });