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diff --git a/intern/libmv/libmv/image/sample_test.cc b/intern/libmv/libmv/image/sample_test.cc
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+++ b/intern/libmv/libmv/image/sample_test.cc
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+// Copyright (c) 2007, 2008 libmv authors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+
+#include "libmv/image/sample.h"
+#include "testing/testing.h"
+
+using namespace libmv;
+
+namespace {
+
+TEST(Image, Nearest) {
+  Array3Du image(2, 2);
+  image(0, 0) = 0;
+  image(0, 1) = 1;
+  image(1, 0) = 2;
+  image(1, 1) = 3;
+  EXPECT_EQ(0, SampleNearest(image, -0.4f, -0.4f));
+  EXPECT_EQ(0, SampleNearest(image,  0.4f,  0.4f));
+  EXPECT_EQ(3, SampleNearest(image,  0.6f,  0.6f));
+  EXPECT_EQ(3, SampleNearest(image,  1.4f,  1.4f));
+}
+
+TEST(Image, Linear) {
+  Array3Df image(2, 2);
+  image(0, 0) = 0;
+  image(0, 1) = 1;
+  image(1, 0) = 2;
+  image(1, 1) = 3;
+  EXPECT_EQ(1.5, SampleLinear(image, 0.5, 0.5));
+}
+
+TEST(Image, DownsampleBy2) {
+  Array3Df image(2, 2);
+  image(0, 0) = 0;
+  image(0, 1) = 1;
+  image(1, 0) = 2;
+  image(1, 1) = 3;
+  Array3Df resampled_image;
+  DownsampleChannelsBy2(image, &resampled_image);
+  ASSERT_EQ(1, resampled_image.Height());
+  ASSERT_EQ(1, resampled_image.Width());
+  ASSERT_EQ(1, resampled_image.Depth());
+  EXPECT_FLOAT_EQ(6./4., resampled_image(0, 0));
+}
+
+TEST(Image, DownsampleBy2MultiChannel) {
+  Array3Df image(2, 2, 3);
+  image(0, 0, 0) = 0;
+  image(0, 1, 0) = 1;
+  image(1, 0, 0) = 2;
+  image(1, 1, 0) = 3;
+
+  image(0, 0, 1) = 5;
+  image(0, 1, 1) = 6;
+  image(1, 0, 1) = 7;
+  image(1, 1, 1) = 8;
+
+  image(0, 0, 2) = 9;
+  image(0, 1, 2) = 10;
+  image(1, 0, 2) = 11;
+  image(1, 1, 2) = 12;
+
+  Array3Df resampled_image;
+  DownsampleChannelsBy2(image, &resampled_image);
+  ASSERT_EQ(1, resampled_image.Height());
+  ASSERT_EQ(1, resampled_image.Width());
+  ASSERT_EQ(3, resampled_image.Depth());
+  EXPECT_FLOAT_EQ((0+1+2+3)/4.,    resampled_image(0, 0, 0));
+  EXPECT_FLOAT_EQ((5+6+7+8)/4.,    resampled_image(0, 0, 1));
+  EXPECT_FLOAT_EQ((9+10+11+12)/4., resampled_image(0, 0, 2));
+}
+}  // namespace