Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/integration/analysis/occurrences_test.dart

Index: pkg/analysis_server/test/integration/analysis/occurrences_test.dart
diff --git a/pkg/analysis_server/test/integration/analysis/occurrences_test.dart b/pkg/analysis_server/test/integration/analysis/occurrences_test.dart
index 1bcb2709bcf687baaad33652af9ccec347a9c842..7dbb360822730304808e7409624b2ae97c6f1825 100644
--- a/pkg/analysis_server/test/integration/analysis/occurrences_test.dart
+++ b/pkg/analysis_server/test/integration/analysis/occurrences_test.dart
@@ -5,15 +5,17 @@
 library test.integration.analysis.occurrences;
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../../utils.dart';
 import '../integration_tests.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(Test);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(Test);
+  });
 }
 
 @reflectiveTest
@@ -52,6 +54,7 @@ main() {
         fail('No element found matching $elementName');
         return null;
       }
+
       void check(String elementName, Iterable<String> expectedOccurrences) {
         Set<int> expectedOffsets = expectedOccurrences
             .map((String substring) => text.indexOf(substring))
@@ -59,6 +62,7 @@ main() {
         Set<int> foundOffsets = findOffsets(elementName);
         expect(foundOffsets, equals(expectedOffsets));
       }
+
       check('i', ['i = 0', 'i < 10', 'i++', 'i;']);
       check('j', ['j = 0', 'j < i', 'j++', 'j;']);
       check('sum', ['sum = 0', 'sum +=', 'sum)']);