Handle invalid URIs in summaries.

pkg/analyzer/test/src/summary/prelinker_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.src.summary.prelinker_test;
 
 import 'package:analyzer/src/generated/utilities_dart.dart';
+import 'package:analyzer/src/summary/format.dart';
 import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer/src/summary/prelink.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'summarize_ast_test.dart';
 import 'summary_common.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(PrelinkerTest);
@@ skipping 10 matching lines @@
   @override
   bool get skipFullyLinkedData => true;
 
   @override
   bool get strongMode => false;
 
   @override
   void serializeLibraryText(String text, {bool allowErrors: false}) {
     super.serializeLibraryText(text, allowErrors: allowErrors);
 
-    UnlinkedUnit getPart(String relativeUri) {
+    UnlinkedUnit getPart(String relativeUriStr) {
+      Uri relativeUri;
+      try {
+        relativeUri = Uri.parse(relativeUriStr);
+      } on FormatException {
+        return new UnlinkedUnitBuilder();
+      }
+
       String absoluteUri =
-          resolveRelativeUri(linkerInputs.testDartUri, Uri.parse(relativeUri))
-              .toString();
+          resolveRelativeUri(linkerInputs.testDartUri, relativeUri).toString();
       return linkerInputs.getUnit(absoluteUri);
     }
 
     UnlinkedPublicNamespace getImport(String relativeUri) {
       return getPart(relativeUri)?.publicNamespace;
     }
 
     linked = new LinkedLibrary.fromBuffer(prelink(
         linkerInputs.unlinkedDefiningUnit,
         getPart,
         getImport,
         (String declaredVariable) => null).toBuffer());
     validateLinkedLibrary(linked);
   }
 }