Handle invalid URIs in summaries.

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

Index: pkg/analyzer/test/src/summary/summarize_ast_test.dart
diff --git a/pkg/analyzer/test/src/summary/summarize_ast_test.dart b/pkg/analyzer/test/src/summary/summarize_ast_test.dart
index 932e1fcddbe809f5bae3dfbb86b0fdd5dede0e24..4105d3224f29e934937fcfc03d2b9a7752324231 100644
--- a/pkg/analyzer/test/src/summary/summarize_ast_test.dart
+++ b/pkg/analyzer/test/src/summary/summarize_ast_test.dart
@@ -153,14 +153,21 @@ abstract class LinkedSummarizeAstTest extends SummaryLinkerTest
     expect(linked, isNotNull);
     validateLinkedLibrary(linked);
     unlinkedUnits = <UnlinkedUnit>[linkerInputs.unlinkedDefiningUnit];
-    for (String relativeUri
+    for (String relativeUriStr
         in linkerInputs.unlinkedDefiningUnit.publicNamespace.parts) {
+      Uri relativeUri;
+      try {
+        relativeUri = Uri.parse(relativeUriStr);
+      } on FormatException {
+        unlinkedUnits.add(new UnlinkedUnitBuilder());
+        continue;
+      }
+
       UnlinkedUnit unit = uriToUnit[
-          resolveRelativeUri(linkerInputs.testDartUri, Uri.parse(relativeUri))
-              .toString()];
+          resolveRelativeUri(linkerInputs.testDartUri, relativeUri).toString()];
       if (unit == null) {
         if (!allowMissingFiles) {
-          fail('Test referred to unknown unit $relativeUri');
+          fail('Test referred to unknown unit $relativeUriStr');
         }
       } else {
         unlinkedUnits.add(unit);