diff --git a/clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp b/clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp
--- a/clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp
+++ b/clang-tools-extra/clangd/unittests/TUSchedulerTests.cpp
@@ -8,6 +8,7 @@
 
 #include "Annotations.h"
 #include "Cancellation.h"
+#include "ClangdServer.h"
 #include "Context.h"
 #include "Diagnostics.h"
 #include "Matchers.h"
@@ -844,7 +845,9 @@
   } CaptureTUStatus;
   MockFSProvider FS;
   MockCompilationDatabase CDB;
-  ClangdServer Server(CDB, FS, ClangdServer::optsForTest(), &CaptureTUStatus);
+  auto Opts = ClangdServer::optsForTest();
+  Opts.AsyncThreadsCount = 0;
+  ClangdServer Server(CDB, FS, Opts, &CaptureTUStatus);
   Annotations Code("int m^ain () {}");
 
   // We schedule the following tasks in the queue:
@@ -858,27 +861,12 @@
 
   ASSERT_TRUE(Server.blockUntilIdleForTest());
 
-  EXPECT_THAT(CaptureTUStatus.allStatus(),
-              ElementsAre(
-                  // Everything starts with ASTWorker starting to execute an
-                  // update
-                  TUState(PreambleAction::Idle, ASTAction::RunningAction),
-                  // We build the preamble
-                  TUState(PreambleAction::Building, ASTAction::RunningAction),
-                  // We built the preamble, and issued ast built on ASTWorker
-                  // thread. Preambleworker goes idle afterwards.
-                  TUState(PreambleAction::Idle, ASTAction::RunningAction),
-                  // Start task for building the ast, as a result of building
-                  // preamble, on astworker thread.
-                  TUState(PreambleAction::Idle, ASTAction::RunningAction),
-                  // AST build starts.
-                  TUState(PreambleAction::Idle, ASTAction::Building),
-                  // AST built finished successfully
-                  TUState(PreambleAction::Idle, ASTAction::Building),
-                  // Running go to def
-                  TUState(PreambleAction::Idle, ASTAction::RunningAction),
-                  // ASTWorker goes idle.
-                  TUState(PreambleAction::Idle, ASTAction::Idle)));
+  EXPECT_THAT(
+      CaptureTUStatus.allStatus(),
+      ElementsAre(TUState(PreambleAction::Building, ASTAction::Idle),
+                  TUState(PreambleAction::Building, ASTAction::Building),
+                  TUState(PreambleAction::Building, ASTAction::Building),
+                  TUState(PreambleAction::Idle, ASTAction::Building)));
 }
 
 TEST_F(TUSchedulerTests, CommandLineErrors) {