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diff --git a/mlir/test/lib/TestDialect/TestDialect.h b/mlir/test/lib/TestDialect/TestDialect.h
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+//===- TestDialect.h - MLIR Dialect for testing -----------------*- C++ -*-===//
+//
+// Part of the MLIR 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a fake 'test' dialect that can be used for testing things
+// that do not have a respective counterpart in the main source directories.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_TESTDIALECT_H
+#define MLIR_TESTDIALECT_H
+
+#include "mlir/Analysis/CallInterfaces.h"
+#include "mlir/Analysis/InferTypeOpInterface.h"
+#include "mlir/Dialect/Traits.h"
+#include "mlir/IR/Dialect.h"
+#include "mlir/IR/OpDefinition.h"
+#include "mlir/IR/OpImplementation.h"
+#include "mlir/IR/StandardTypes.h"
+#include "mlir/IR/SymbolTable.h"
+
+#include "TestOpEnums.h.inc"
+
+namespace mlir {
+
+class TestDialect : public Dialect {
+public:
+  /// Create the dialect in the given `context`.
+  TestDialect(MLIRContext *context);
+
+  /// Get the canonical string name of the dialect.
+  static StringRef getDialectName() { return "test"; }
+
+  LogicalResult verifyOperationAttribute(Operation *op,
+                                         NamedAttribute namedAttr) override;
+  LogicalResult verifyRegionArgAttribute(Operation *op, unsigned regionIndex,
+                                         unsigned argIndex,
+                                         NamedAttribute namedAttr) override;
+  LogicalResult verifyRegionResultAttribute(Operation *op, unsigned regionIndex,
+                                            unsigned resultIndex,
+                                            NamedAttribute namedAttr) override;
+};
+
+#define GET_OP_CLASSES
+#include "TestOps.h.inc"
+
+} // end namespace mlir
+
+#endif // MLIR_TESTDIALECT_H