update test to anticipate verifying augmentations

Change-Id: I9866d05f6a503e3a3b030d6c27173fe6aa61d9e4
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/366064
Commit-Queue: Phil Quitslund <pquitslund@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>

pkg/linter/test/rules/use_enums_test.dart

@@ -18,13 +18,13 @@ class UseEnumsTest extends LintRuleTest {
   String get lintRule => 'use_enums';
 
   test_augmentation() async {
-    newFile('$testPackageLibPath/a.dart', r'''
-import augment 'test.dart';
+    var a = newFile('$testPackageLibPath/a.dart', r'''
+import augment 'b.dart';
 
 class C {}
 ''');
 
-    await assertNoDiagnostics(r'''
+    var b = newFile('$testPackageLibPath/b.dart', r'''
 augment library 'a.dart';
 
 augment class C {
@@ -34,6 +34,15 @@ augment class C {
   const C._(this.i);
 }
 ''');
+
+    result = await resolveFile(a.path);
+    await assertDiagnosticsIn(errors, [
+      // TODO(pq): update when augmentation contributed fields are considered.
+      // See: https://github.com/dart-lang/linter/issues/4900
+    ]);
+
+    result = await resolveFile(b.path);
+    await assertNoDiagnosticsIn(errors);
   }
 
   test_constructor_private() async {