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diff --git a/internal/ceres/array_utils_test.cc b/internal/ceres/array_utils_test.cc
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+// Ceres Solver - A fast non-linear least squares minimizer
+// Copyright 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: sameeragarwal@google.com (Sameer Agarwal)
+
+#include "ceres/array_utils.h"
+
+#include <limits>
+#include <cmath>
+#include "gtest/gtest.h"
+
+namespace ceres {
+namespace internal {
+
+TEST(ArrayUtils, IsArrayValid) {
+  double x[3];
+  x[0] = 0.0;
+  x[1] = 1.0;
+  x[2] = 2.0;
+  EXPECT_TRUE(IsArrayValid(3, x));
+  x[1] = std::numeric_limits<double>::infinity();
+  EXPECT_FALSE(IsArrayValid(3, x));
+  x[1] = std::numeric_limits<double>::quiet_NaN();
+  EXPECT_FALSE(IsArrayValid(3, x));
+  x[1] = std::numeric_limits<double>::signaling_NaN();
+  EXPECT_FALSE(IsArrayValid(3, x));
+  EXPECT_TRUE(IsArrayValid(1, NULL));
+  InvalidateArray(3, x);
+  EXPECT_FALSE(IsArrayValid(3, x));
+}
+
+}  // namespace internal
+}  // namespace ceres