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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
+// http://code.google.com/p/ceres-solver/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors may be
+//   used to endorse or promote products derived from this software without
+//   specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: keir@google.com (Keir Mierle)
+
+#include <string>
+#include "ceres/internal/port.h"
+
+#ifndef CERES_INTERNAL_TEST_UTIL_H_
+#define CERES_INTERNAL_TEST_UTIL_H_
+
+namespace ceres {
+namespace internal {
+
+// Expects that x and y have a relative difference of no more than
+// max_abs_relative_difference. If either x or y is zero, then the relative
+// difference is interpreted as an absolute difference.
+bool ExpectClose(double x, double y, double max_abs_relative_difference);
+
+// Expects that for all i = 1,.., n - 1
+//
+//   |p[i] - q[i]| / max(|p[i]|, |q[i]|) < tolerance
+void ExpectArraysClose(int n,
+                       const double* p,
+                       const double* q,
+                       double tolerance);
+
+// Expects that for all i = 1,.., n - 1
+//
+//   |p[i] / max_norm_p - q[i] / max_norm_q| < tolerance
+//
+// where max_norm_p and max_norm_q are the max norms of the arrays p
+// and q respectively.
+void ExpectArraysCloseUptoScale(int n,
+                                const double* p,
+                                const double* q,
+                                double tolerance);
+
+// Construct a fully qualified path for the test file depending on the
+// local build/testing environment.
+string TestFileAbsolutePath(const string& filename);
+
+}  // namespace internal
+}  // namespace ceres
+
+#endif  // CERES_INTERNAL_TEST_UTIL_H_