Update Math.Test.cs

Author: RayWang-iat

test/TensorFlowNET.UnitTest/Numpy/Math.Test.cs

@@ -65,5 +65,17 @@ public void power()
             var y = np.power(x, 3);
             Assert.AreEqual(y, new[] { 0, 1, 8, 27, 64, 125 });
         }
+         [TestMethod]
+        public void maximum()
+        {
+            var x1 = new NDArray(new[,] { { 1, 2, 3 }, { 4, 5.1, 6 } });
+            var x2 = new NDArray(new[,] { { 3, 2, 1 }, { 6, 5.1, 4 } });
+            var y = np.maximum(x1,x2);
+            var y1 = np.maximum(x1, x2, axis: 0);
+            var y2 = new NDArray(new[,] { { 3, 2, 3 }, { 6, 5.1, 6 } });
+            var y3 = new NDArray(new[] {  6, 5.1, 6 });
+            Assert.AreEqual(y, y2);
+            Assert.AreEqual(y1, y3);
+        }
     }
 }