Don't attempt to create a file for non-Dart imports.

pkg/analysis_server/test/services/correction/fix_test.dart

 // Copyright (c) 2014, 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 test.services.correction.fix;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/edit/fix/fix_core.dart';
 import 'package:analysis_server/plugin/edit/fix/fix_dart.dart';
@@ skipping 1475 matching lines @@
     // validate change
     List<SourceFileEdit> fileEdits = change.edits;
     expect(fileEdits, hasLength(1));
     SourceFileEdit fileEdit = change.edits[0];
     expect(fileEdit.file, '/my/project/bin/my_file.dart');
     expect(fileEdit.fileStamp, -1);
     expect(fileEdit.edits, hasLength(1));
     expect(fileEdit.edits[0].replacement, contains('library my_file;'));
   }
 
+  test_createFile_forImport_BAD_inPackage_lib_justLib() async {
+    provider.newFile('/projects/my_package/pubspec.yaml', 'name: my_package');
+    testFile = '/projects/my_package/test.dart';
+    resolveTestUnit('''
+import 'lib';
+''');
+    await assertNoFix(DartFixKind.CREATE_FILE);
+  }
+
+  test_createFile_forImport_BAD_notDart() async {
+    testFile = '/my/project/bin/test.dart';
+    resolveTestUnit('''
+import 'my_file.txt';
+''');
+    await assertNoFix(DartFixKind.CREATE_FILE);
+  }
+
   test_createFile_forImport_inPackage_lib() async {
     provider.newFile('/projects/my_package/pubspec.yaml', 'name: my_package');
     testFile = '/projects/my_package/lib/test.dart';
     provider.newFolder('/projects/my_package/lib');
     resolveTestUnit('''
 import 'a/bb/c_cc/my_lib.dart';
 ''');
     AnalysisError error = _findErrorToFix();
     fix = await _assertHasFix(DartFixKind.CREATE_FILE, error);
     change = fix.change;
@@ skipping 3200 matching lines @@
       int offset = resultCode.indexOf(search);
       positions.add(new Position(testFile, offset));
     }
     return positions;
   }
 
   void _performAnalysis() {
     while (context.performAnalysisTask().hasMoreWork);
   }
 }