diff --git a/Tests/TestTools.h b/Tests/TestTools.h
new file mode 100644
index 0000000000000000000000000000000000000000..767e58ecac6852e27b054750771b4c4b714780d9
--- /dev/null
+++ b/Tests/TestTools.h
@@ -0,0 +1,31 @@
+/**
+ * \file
+ * \author Norihiro Watanabe
+ * \date   2013-04-16
+ * \brief
+ *
+ * \copyright
+ * Copyright (c) 2013, OpenGeoSys Community (http://www.opengeosys.org)
+ *            Distributed under a Modified BSD License.
+ *              See accompanying file LICENSE.txt or
+ *              http://www.opengeosys.org/project/license
+ *
+ */
+
+#include <gtest/gtest.h>
+
+#ifndef TESTTOOLS_H_
+#define TESTTOOLS_H_
+
+inline void ASSERT_DOUBLE_ARRAY_EQ(const double* Expected, const double* Actual, std::size_t N, double epsilon=1.0e-8) {
+    for (size_t i=0; i<N; i++) \
+        ASSERT_NEAR(Expected[i], Actual[i], epsilon);
+}
+
+template <typename T1, typename T2>
+inline void ASSERT_DOUBLE_ARRAY_EQ(const T1 &Expected, const T2 &Actual, std::size_t N, double epsilon=1.0e-8) {
+    for (size_t i=0; i<N; i++) \
+        ASSERT_NEAR(Expected[i], Actual[i], epsilon);
+}
+
+#endif // TESTTOOLS_H_