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diff --git a/clang-tidy/google/AvoidUnderscoreInGoogletestNameCheck.h b/clang-tidy/google/AvoidUnderscoreInGoogletestNameCheck.h
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+++ b/clang-tidy/google/AvoidUnderscoreInGoogletestNameCheck.h
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+//===--- AvoidUnderscoreInGoogletestNameCheck.h - clang-tidy ----*- 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_CLANG_TIDY_GOOGLE_AVOIDUNDERSCOREINGOOGLETESTNAMECHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_GOOGLE_AVOIDUNDERSCOREINGOOGLETESTNAMECHECK_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace google {
+namespace readability {
+
+// Check for underscores in the names of googletest tests, per
+// https://github.com/google/googletest/blob/master/googletest/docs/faq.md#why-should-test-suite-names-and-test-names-not-contain-underscore
+class AvoidUnderscoreInGoogletestNameCheck : public ClangTidyCheck {
+public:
+  using ClangTidyCheck::ClangTidyCheck;
+
+  void registerPPCallbacks(CompilerInstance &Compiler) override;
+};
+
+} // namespace readability
+} // namespace google
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_GOOGLE_AVOIDUNDERSCOREINGOOGLETESTNAMECHECK_H