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diff --git a/test/unit/api/op_white.cpp b/test/unit/api/op_white.cpp
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+++ b/test/unit/api/op_white.cpp
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+/*********************                                                        */
+/*! \file op_white.cpp
+ ** \verbatim
+ ** Top contributors (to current version):
+ **   Aina Niemetz
+ ** This file is part of the CVC4 project.
+ ** Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
+ ** in the top-level source directory and their institutional affiliations.
+ ** All rights reserved.  See the file COPYING in the top-level source
+ ** directory for licensing information.\endverbatim
+ **
+ ** \brief White box testing of the Op class.
+ **/
+
+#include "test_api.h"
+
+namespace CVC4 {
+
+using namespace api;
+
+namespace test {
+
+class TestApiWhiteOp : public TestApi
+{
+};
+
+TEST_F(TestApiWhiteOp, opFromKind)
+{
+  Op plus(&d_solver, PLUS);
+  ASSERT_FALSE(plus.isIndexed());
+  ASSERT_THROW(plus.getIndices<uint32_t>(), CVC4ApiException);
+  ASSERT_EQ(plus, d_solver.mkOp(PLUS));
+}
+}  // namespace test
+}  // namespace CVC4