add test (compilation is broken)

Author: espdev

tests/ndg_make.rs

@@ -0,0 +1,21 @@
+use ndarray::array;
+
+use csaps::GridCubicSmoothingSpline;
+
+
+#[test]
+fn test_make_surface() {
+    let x0 = array![1., 2., 3.];
+    let x1 = array![1., 2., 3., 4.];
+
+    let x = vec![&x0, &x1];
+
+    let y = array![
+        [1., 2., 3., 4.],
+        [5., 6., 7., 8.],
+        [9., 10., 11., 12.],
+    ];
+
+    let spline = GridCubicSmoothingSpline::new(&x, &y)
+        .make().unwrap();
+}