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diff --git a/intern/libmv/libmv/numeric/function_derivative_test.cc b/intern/libmv/libmv/numeric/function_derivative_test.cc
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+// Copyright (c) 2007, 2008, 2009 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 "testing/testing.h"
+#include "libmv/numeric/numeric.h"
+#include "libmv/numeric/function_derivative.h"
+
+using namespace libmv;
+
+namespace {
+
+class F {
+ public:
+  typedef Vec2 FMatrixType;
+  typedef Vec3 XMatrixType;
+  Vec2 operator()(const Vec3 &x) const {
+    Vec2 fx;
+    fx << 0.19*x(0) + 0.19*x(1)*x(1) + x(2),
+          3*sin(x(0)) + 2*cos(x(1));
+    return fx;
+  }
+  Mat23 J(const Vec3 &x) const {
+    Mat23 jacobian;
+    jacobian << 0.19, 2*0.19*x(1), 1.0,
+                3*cos(x(0)), -2*sin(x(1)), 0;
+    return jacobian;
+  }
+};
+
+TEST(FunctionDerivative, SimpleCase) {
+  Vec3 x; x << 0.76026643, 0.01799744, 0.55192142;
+  F f;
+  NumericJacobian<F, CENTRAL> J(f);
+  EXPECT_MATRIX_NEAR(f.J(x), J(x), 1e-8);
+  NumericJacobian<F, FORWARD> J_forward(f);
+  // Forward difference is very inaccurate.
+  EXPECT_MATRIX_NEAR(f.J(x), J_forward(x), 1e-5);
+}
+
+}  // namespace