1 files changed, 83 insertions, 0 deletions
diff --git a/third_party/rust/smawk/tests/monge.rs b/third_party/rust/smawk/tests/monge.rs
new file mode 100644
index 0000000000..67058a75a5
--- /dev/null
+++ b/third_party/rust/smawk/tests/monge.rs
@@ -0,0 +1,83 @@
+#![cfg(feature = "ndarray")]
+
+use ndarray::{arr2, Array, Array2};
+use rand::SeedableRng;
+use rand_chacha::ChaCha20Rng;
+use smawk::monge::is_monge;
+
+mod random_monge;
+use random_monge::{random_monge_matrix, MongePrim};
+
+#[test]
+fn random_monge() {
+    let mut rng = ChaCha20Rng::seed_from_u64(0);
+    let matrix: Array2<u8> = random_monge_matrix(5, 5, &mut rng);
+
+    assert!(is_monge(&matrix));
+    assert_eq!(
+        matrix,
+        arr2(&[
+            [2, 3, 4, 4, 5],
+            [5, 5, 6, 6, 7],
+            [3, 3, 4, 4, 5],
+            [5, 2, 3, 3, 4],
+            [5, 2, 3, 3, 4]
+        ])
+    );
+}
+
+#[test]
+fn monge_constant_rows() {
+    let mut rng = ChaCha20Rng::seed_from_u64(0);
+    let matrix: Array2<u8> = MongePrim::ConstantRows.to_matrix(5, 4, &mut rng);
+    assert!(is_monge(&matrix));
+    for row in matrix.rows() {
+        let elem = row[0];
+        assert_eq!(row, Array::from_elem(matrix.ncols(), elem));
+    }
+}
+
+#[test]
+fn monge_constant_cols() {
+    let mut rng = ChaCha20Rng::seed_from_u64(0);
+    let matrix: Array2<u8> = MongePrim::ConstantCols.to_matrix(5, 4, &mut rng);
+    assert!(is_monge(&matrix));
+    for column in matrix.columns() {
+        let elem = column[0];
+        assert_eq!(column, Array::from_elem(matrix.nrows(), elem));
+    }
+}
+
+#[test]
+fn monge_upper_right_ones() {
+    let mut rng = ChaCha20Rng::seed_from_u64(1);
+    let matrix: Array2<u8> = MongePrim::UpperRightOnes.to_matrix(5, 4, &mut rng);
+    assert!(is_monge(&matrix));
+    assert_eq!(
+        matrix,
+        arr2(&[
+            [0, 0, 1, 1],
+            [0, 0, 1, 1],
+            [0, 0, 1, 1],
+            [0, 0, 0, 0],
+            [0, 0, 0, 0]
+        ])
+    );
+}
+
+#[test]
+fn monge_lower_left_ones() {
+    let mut rng = ChaCha20Rng::seed_from_u64(1);
+    let matrix: Array2<u8> = MongePrim::LowerLeftOnes.to_matrix(5, 4, &mut rng);
+    assert!(is_monge(&matrix));
+    assert_eq!(
+        matrix,
+        arr2(&[
+            [0, 0, 0, 0],
+            [0, 0, 0, 0],
+            [1, 1, 0, 0],
+            [1, 1, 0, 0],
+            [1, 1, 0, 0]
+        ])
+    );
+}