In the new task model, use explicit dependencies on the type provider.

pkg/analyzer/test/src/task/dart_test.dart

Index: pkg/analyzer/test/src/task/dart_test.dart
diff --git a/pkg/analyzer/test/src/task/dart_test.dart b/pkg/analyzer/test/src/task/dart_test.dart
index fcdf0112f0c1963a7c6bf1bda6fee117d235e723..8e3882c49fc4860c1ea6349cd0d631db6df3c7c1 100644
--- a/pkg/analyzer/test/src/task/dart_test.dart
+++ b/pkg/analyzer/test/src/task/dart_test.dart
@@ -2391,6 +2391,7 @@ class _AbstractDartTaskTest extends AbstractContextTest {
   void _computeResult(AnalysisTarget target, ResultDescriptor result) {
     oldOutputs = outputs;
     task = analysisDriver.computeResult(target, result);
+    expect(task, isNotNull);
     expect(task.caughtException, isNull);
     outputs = task.outputs;
   }