diff --git a/clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp b/clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp
--- a/clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp
+++ b/clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp
@@ -49,11 +49,11 @@
                   "clangd/unittests/remote/MarshallingTests.cpp",
                   Strings);
   auto Serialized = ProtobufMarshaller.toProtobuf(Original);
-  EXPECT_TRUE(Serialized);
+  ASSERT_TRUE(Serialized);
   EXPECT_EQ(Serialized->location().file_path(),
             "clang-tools-extra/clangd/unittests/remote/MarshallingTests.cpp");
   auto Deserialized = ProtobufMarshaller.fromProtobuf(*Serialized);
-  EXPECT_TRUE(Deserialized);
+  ASSERT_TRUE(Deserialized);
   EXPECT_STREQ(Deserialized->Location.FileURI,
                testPathURI("home/my-projects/llvm-project/clang-tools-extra/"
                            "clangd/unittests/remote/MarshallingTests.cpp",
@@ -73,7 +73,7 @@
   // Can not use URIs with scheme different from "file".
   auto UnittestURI =
       URI::create(testPath("project/lib/HelloWorld.cpp"), "unittest");
-  EXPECT_TRUE(bool(UnittestURI));
+  ASSERT_TRUE(bool(UnittestURI));
   WithInvalidURI.Location.FileURI =
       Strings.save(UnittestURI->toString()).begin();
   Serialized = ProtobufMarshaller.toProtobuf(WithInvalidURI);
@@ -92,7 +92,7 @@
   clangd::Symbol Sym;
 
   auto ID = SymbolID::fromStr("057557CEBF6E6B2D");
-  EXPECT_TRUE(bool(ID));
+  ASSERT_TRUE(bool(ID));
   Sym.ID = *ID;
 
   index::SymbolInfo Info;
@@ -140,9 +140,9 @@
   // Check that symbols are exactly the same if the path to indexed project is
   // the same on indexing machine and the client.
   auto Serialized = ProtobufMarshaller.toProtobuf(Sym);
-  EXPECT_TRUE(Serialized);
+  ASSERT_TRUE(Serialized);
   auto Deserialized = ProtobufMarshaller.fromProtobuf(*Serialized);
-  EXPECT_TRUE(Deserialized);
+  ASSERT_TRUE(Deserialized);
   EXPECT_EQ(toYAML(Sym), toYAML(*Deserialized));
   // Serialized paths are relative and have UNIX slashes.
   EXPECT_EQ(convert_to_slash(Serialized->definition().file_path(),
@@ -154,7 +154,7 @@
   // Missing definition is OK.
   Sym.Definition = clangd::SymbolLocation();
   Serialized = ProtobufMarshaller.toProtobuf(Sym);
-  EXPECT_TRUE(Serialized);
+  ASSERT_TRUE(Serialized);
   Deserialized = ProtobufMarshaller.fromProtobuf(*Serialized);
   EXPECT_TRUE(Deserialized);
 
@@ -172,7 +172,7 @@
 
   // Schemes other than "file" can not be used.
   auto UnittestURI = URI::create(testPath("home/SomePath.h"), "unittest");
-  EXPECT_TRUE(bool(UnittestURI));
+  ASSERT_TRUE(bool(UnittestURI));
   Location.FileURI = Strings.save(UnittestURI->toString()).begin();
   Sym.Definition = Location;
   Serialized = ProtobufMarshaller.toProtobuf(Sym);
@@ -183,9 +183,9 @@
   Sym.Definition = Location;
   // Check that the symbol is valid and passing the correct path works.
   Serialized = ProtobufMarshaller.toProtobuf(Sym);
-  EXPECT_TRUE(Serialized);
+  ASSERT_TRUE(Serialized);
   Deserialized = ProtobufMarshaller.fromProtobuf(*Serialized);
-  EXPECT_TRUE(Deserialized);
+  ASSERT_TRUE(Deserialized);
   EXPECT_STREQ(Deserialized->Definition.FileURI,
                testPathURI("home/File.h", Strings));
   // Fail with a wrong root.
@@ -214,9 +214,9 @@
                                 testPath("llvm-project/"));
 
   auto Serialized = ProtobufMarshaller.toProtobuf(Ref);
-  EXPECT_TRUE(Serialized);
+  ASSERT_TRUE(Serialized);
   auto Deserialized = ProtobufMarshaller.fromProtobuf(*Serialized);
-  EXPECT_TRUE(Deserialized);
+  ASSERT_TRUE(Deserialized);
   EXPECT_EQ(toYAML(Ref), toYAML(*Deserialized));
 }
 
@@ -272,9 +272,9 @@
   auto Serialized = ProtobufMarshaller.toProtobuf(Sym);
   EXPECT_EQ(static_cast<size_t>(Serialized->headers_size()),
             ValidHeaders.size());
-  EXPECT_TRUE(Serialized);
+  ASSERT_TRUE(Serialized);
   auto Deserialized = ProtobufMarshaller.fromProtobuf(*Serialized);
-  EXPECT_TRUE(Deserialized);
+  ASSERT_TRUE(Deserialized);
 
   Sym.IncludeHeaders = ValidHeaders;
   EXPECT_EQ(toYAML(Sym), toYAML(*Deserialized));