Set LibraryElement.entryPoint properly during summary resynthesis.

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

 // Copyright (c) 2015, 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.src.serialization.elements_test;
 
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/base.dart';
@@ skipping 46 matching lines @@
     for (int i = 0; i < resynthesized.imports.length; i++) {
       compareImportElements(resynthesized.imports[i], original.imports[i],
           'import ${original.imports[i].uri}');
     }
     expect(resynthesized.exports.length, original.exports.length);
     for (int i = 0; i < resynthesized.exports.length; i++) {
       compareExportElements(resynthesized.exports[i], original.exports[i],
           'export ${original.exports[i].uri}');
     }
     expect(resynthesized.nameLength, original.nameLength);
-    // TODO(paulberry): test entryPoint, exportNamespace, publicNamespace,
+    if (original.entryPoint == null) {
+      expect(resynthesized.entryPoint, isNull);
+    } else {
+      expect(resynthesized.entryPoint, isNotNull);
+      compareFunctionElements(
+          resynthesized.entryPoint, original.entryPoint, '(entry point)');
+    }
+    // TODO(paulberry): test exportNamespace, publicNamespace,
     // and metadata.
   }
 
   void compareClassElements(
       ClassElementImpl resynthesized, ClassElementImpl original, String desc) {
     compareElements(resynthesized, original, desc);
     expect(resynthesized.fields.length, original.fields.length,
         reason: '$desc fields.length');
     for (int i = 0; i < resynthesized.fields.length; i++) {
       String name = original.fields[i].name;
@@ skipping 714 matching lines @@
     addLibrary('dart:async');
     checkLibrary('export "dart:async" show Future, Stream;');
   }
 
   test_exports() {
     addLibrarySource('/a.dart', 'library a;');
     addLibrarySource('/b.dart', 'library b;');
     checkLibrary('export "a.dart"; export "b.dart";');
   }
 
+  test_function_entry_point() {
+    checkLibrary('main() {}');
+  }
+
+  test_function_entry_point_in_part() {
+    addNamedSource('/a.dart', 'part of my.lib; main() {}');
+    checkLibrary('library my.lib; part "a.dart";');
+  }
+
   test_function_external() {
     checkLibrary('external f();');
   }
 
   test_function_parameter_kind_named() {
     // TODO(paulberry): also test default value.
     checkLibrary('f({x}) {}');
   }
 
   test_function_parameter_kind_positional() {
@@ skipping 369 matching lines @@
   }
 
   test_variable_implicit_type() {
     checkLibrary('var x;');
   }
 
   test_variables() {
     checkLibrary('int i; int j;');
   }
 }