Update the Angular/DI tests to latest from github.

third_party/pkg/di/test/generator_test.dart

+import 'dart:io';
+import 'package:analyzer/analyzer.dart';
+import 'package:di/generator.dart' as generator;
+import 'package:unittest/unittest.dart';
+
+main(args) => group('generator', () {
+
+  test('should codesplit deferred libraries', () {
+    Map<generator.Chunk, String> code = generator.generateCode(
+        'test/assets/gen_test1/main.dart', ['annotations.Injectable'],
+        Platform.environment['DART_SDK'], [Platform.packageRoot]);
+
+    expect(code.keys.map((chunk) => chunk.library == null ? null : chunk.library.name),
+        unorderedEquals([null, 'lib_a', 'lib_b']));
+
+    code.forEach((chunk, code) {
+      var cu = parseCompilationUnit(code);
+      if (chunk.library == null) {
+        expectHasImports(cu, ['main.dart', 'common1.dart']);
+      } else if (chunk.library.name.endsWith('lib_a')) {
+        expectHasImports(cu, ['a.dart', 'a2.dart', 'common2.dart']);
+      } else if (chunk.library.name.endsWith('lib_b')) {
+        expectHasImports(cu, ['b.dart', 'b2.dart', 'common2.dart']);
+      }
+    });
+  });
+});
+
+expectHasImports(CompilationUnit cu, List<String> expectedImports) {
+  var imports = <String>[];
+  cu.directives.forEach((Directive directive) {
+    if (directive is NamespaceDirective) {
+      if (directive is! ImportDirective) {
+        fail('Only expecting import, no exports.');
+      }
+      ImportDirective import = directive;
+      imports.add(import.uri.stringValue);
+    }
+  });
+  expect(imports.length, equals(expectedImports.length));
+  for (int i = 0; i < imports.length; i++) {
+    expect(imports[i], endsWith(expectedImports[i]));
+  }
+}