Add --build-summary-only-unlinked flag, which makes the output summary be an unlinked summary inste…

pkg/analyzer_cli/test/driver_test.dart

Index: pkg/analyzer_cli/test/driver_test.dart
diff --git a/pkg/analyzer_cli/test/driver_test.dart b/pkg/analyzer_cli/test/driver_test.dart
index d5ab1c1956aa41023096467bff92b50b924935b8..81eb70c5e1a0795277a4869d85a83b79751a1d3e 100644
--- a/pkg/analyzer_cli/test/driver_test.dart
+++ b/pkg/analyzer_cli/test/driver_test.dart
@@ -14,6 +14,7 @@ import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/services/lint.dart';
+import 'package:analyzer/src/summary/idl.dart';
 import 'package:analyzer_cli/src/ansi.dart' as ansi;
 import 'package:analyzer_cli/src/driver.dart';
 import 'package:analyzer_cli/src/options.dart';
@@ -412,6 +413,44 @@ linter:
               additionalArgs: ['--build-suppress-exit-code']);
           expect(exitCode, 0);
         });
+
+        test('Linked summary', () async {
+          await withTempDirAsync((tempDir) async {
+            var outputPath = path.join(tempDir, 'test_file.dart.sum');
+            await doDrive(path.join('data', 'test_file.dart'), additionalArgs: [
+              '--build-summary-only',
+              '--build-summary-output=$outputPath'
+            ]);
+            var output = new File(outputPath);
+            expect(output.existsSync(), isTrue);
+            PackageBundle bundle =
+                new PackageBundle.fromBuffer(await output.readAsBytes());
+            var testFileUri = 'file:///test_file.dart';
+            expect(bundle.unlinkedUnitUris, equals([testFileUri]));
+            expect(bundle.linkedLibraryUris, equals([testFileUri]));
+            expect(exitCode, 0);
+          });
+        });
+
+        test('Unlinked summary only', () async {
+          await withTempDirAsync((tempDir) async {
+            var outputPath = path.join(tempDir, 'test_file.dart.sum');
+            await doDrive(path.join('data', 'test_file.dart'), additionalArgs: [
+              '--build-summary-only',
+              '--build-summary-only-unlinked',
+              '--build-summary-output=$outputPath'
+            ]);
+            var output = new File(outputPath);
+            expect(output.existsSync(), isTrue);
+            PackageBundle bundle =
+                new PackageBundle.fromBuffer(await output.readAsBytes());
+            var testFileUri = 'file:///test_file.dart';
+            expect(bundle.unlinkedUnits.length, 1);
+            expect(bundle.unlinkedUnitUris, equals([testFileUri]));
+            expect(bundle.linkedLibraryUris, isEmpty);
+            expect(exitCode, 0);
+          });
+        });
       });
     }