Issue 29288. Resynthesize Import/Export/PartElement for every directive.

pkg/analyzer/test/src/dart/analysis/file_state_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.
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
@@ skipping 296 matching lines @@
     expect(_excludeSdk(file.importedFiles), isEmpty);
     expect(file.exportedFiles, isEmpty);
     expect(file.partedFiles, isEmpty);
     expect(_excludeSdk(file.directReferencedFiles), isEmpty);
     expect(file.isPart, isFalse);
     expect(file.library, isNull);
     expect(file.unlinked, isNotNull);
     expect(file.unlinked.classes, isEmpty);
   }
 
+  test_getFileForPath_emptyUri() {
+    String path = _p('/test.dart');
+    provider.newFile(
+        path,
+        r'''
+import '';
+export '';
+part '';
+''');
+
+    FileState file = fileSystemState.getFileForPath(path);
+    _assertIsUnresolvedFile(file.importedFiles[0]);
+    _assertIsUnresolvedFile(file.exportedFiles[0]);
+    _assertIsUnresolvedFile(file.partedFiles[0]);
+  }
+
   test_getFileForPath_hasLibraryDirective_hasPartOfDirective() {
     String a = _p('/test/lib/a.dart');
     provider.newFile(
         a,
         r'''
 library L;
 part of L;
 ''');
     FileState file = fileSystemState.getFileForPath(a);
     expect(file.isPart, isFalse);
   }
 
-  test_getFileForPath_import_invalidUri() {
+  test_getFileForPath_invalidUri() {
     String a = _p('/aaa/lib/a.dart');
     String a1 = _p('/aaa/lib/a1.dart');
     String a2 = _p('/aaa/lib/a2.dart');
     String a3 = _p('/aaa/lib/a3.dart');
     String content_a1 = r'''
 import 'package:aaa/a1.dart';
 import '[invalid uri]';
 
+export 'package:aaa/a2.dart';
 export '[invalid uri]';
-export 'package:aaa/a2.dart';
 
 part 'a3.dart';
 part '[invalid uri]';
 ''';
     provider.newFile(a, content_a1);
 
     FileState file = fileSystemState.getFileForPath(a);
 
-    expect(_excludeSdk(file.importedFiles), hasLength(1));
+    expect(_excludeSdk(file.importedFiles), hasLength(2));
     expect(file.importedFiles[0].path, a1);
     expect(file.importedFiles[0].uri, Uri.parse('package:aaa/a1.dart'));
     expect(file.importedFiles[0].source, isNotNull);
+    _assertIsUnresolvedFile(file.importedFiles[1]);
 
-    expect(_excludeSdk(file.exportedFiles), hasLength(1));
+    expect(_excludeSdk(file.exportedFiles), hasLength(2));
     expect(file.exportedFiles[0].path, a2);
     expect(file.exportedFiles[0].uri, Uri.parse('package:aaa/a2.dart'));
     expect(file.exportedFiles[0].source, isNotNull);
+    _assertIsUnresolvedFile(file.exportedFiles[1]);
 
-    expect(_excludeSdk(file.partedFiles), hasLength(1));
+    expect(_excludeSdk(file.partedFiles), hasLength(2));
     expect(file.partedFiles[0].path, a3);
     expect(file.partedFiles[0].uri, Uri.parse('package:aaa/a3.dart'));
     expect(file.partedFiles[0].source, isNotNull);
+    _assertIsUnresolvedFile(file.partedFiles[1]);
   }
 
   test_getFileForPath_library() {
     String a1 = _p('/aaa/lib/a1.dart');
     String a2 = _p('/aaa/lib/a2.dart');
     String a3 = _p('/aaa/lib/a3.dart');
     String a4 = _p('/aaa/lib/a4.dart');
     String b1 = _p('/bbb/lib/b1.dart');
     String b2 = _p('/bbb/lib/b2.dart');
     String content_a1 = r'''
@@ skipping 410 matching lines @@
   void _assertFilesWithoutTransitiveFiles(List<FileState> expected) {
     var actual = fileSystemState.test.filesWithoutTransitiveFiles;
     expect(_excludeSdk(actual), unorderedEquals(expected));
   }
 
   void _assertFilesWithoutTransitiveSignatures(List<FileState> expected) {
     var actual = fileSystemState.test.filesWithoutTransitiveSignature;
     expect(_excludeSdk(actual), unorderedEquals(expected));
   }
 
+  void _assertIsUnresolvedFile(FileState file) {
+    expect(file.path, isNull);
+    expect(file.uri, isNull);
+    expect(file.source, isNull);
+  }
+
   void _assertTransitiveFiles(FileState file, List<FileState> expected) {
     expect(_excludeSdk(file.transitiveFiles), unorderedEquals(expected));
   }
 
   List<T> _excludeSdk<T>(Iterable<T> files) {
     return files.where((Object file) {
       if (file is FileState) {
-        return file.uri.scheme != 'dart';
+        return file.uri?.scheme != 'dart';
       } else {
         return !(file as String).startsWith(_p('/sdk'));
       }
     }).toList();
   }
 
   String _p(String path) => provider.convertPath(path);
 
   static String _md5(String content) {
     return hex.encode(md5.convert(UTF8.encode(content)).bytes);
   }
 }
 
 class _GeneratedUriResolverMock extends TypedMock implements UriResolver {}
 
 class _SourceMock extends TypedMock implements Source {}