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diff --git a/clangd/unittests/TestIndex.h b/clangd/unittests/TestIndex.h
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+//===-- IndexHelpers.h ------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_UNITTESTS_CLANGD_INDEXTESTCOMMON_H
+#define LLVM_CLANG_TOOLS_EXTRA_UNITTESTS_CLANGD_INDEXTESTCOMMON_H
+
+#include "index/Index.h"
+#include "index/Merge.h"
+
+namespace clang {
+namespace clangd {
+
+// Creates Symbol instance and sets SymbolID to given QualifiedName.
+Symbol symbol(llvm::StringRef QName);
+
+// Helpers to produce fake index symbols with proper SymbolID.
+// USRFormat is a regex replacement string for the unqualified part of the USR.
+Symbol sym(llvm::StringRef QName, index::SymbolKind Kind,
+           llvm::StringRef USRFormat);
+// Creats a function symbol assuming no function arg.
+Symbol func(llvm::StringRef Name);
+// Creates a class symbol.
+Symbol cls(llvm::StringRef Name);
+// Creates a variable symbol.
+Symbol var(llvm::StringRef Name);
+// Creates a namespace symbol.
+Symbol ns(llvm::StringRef Name);
+
+// Create a slab of symbols with the given qualified names as IDs and names.
+SymbolSlab generateSymbols(std::vector<std::string> QualifiedNames);
+
+// Create a slab of symbols with IDs and names [Begin, End].
+SymbolSlab generateNumSymbols(int Begin, int End);
+
+// Returns fully-qualified name out of given symbol.
+std::string getQualifiedName(const Symbol &Sym);
+
+// Performs fuzzy matching-based symbol lookup given a query and an index.
+// Incomplete is set true if more items than requested can be retrieved, false
+// otherwise.
+std::vector<std::string> match(const SymbolIndex &I,
+                               const FuzzyFindRequest &Req,
+                               bool *Incomplete = nullptr);
+
+// Returns qualified names of symbols with any of IDs in the index.
+std::vector<std::string> lookup(const SymbolIndex &I,
+                                llvm::ArrayRef<SymbolID> IDs);
+
+} // namespace clangd
+} // namespace clang
+
+#endif