From e30db9e8b14ec6f513e07dd40f816aeeef8028b4 Mon Sep 17 00:00:00 2001
From: sebcrozet <developer@crozet.re>
Date: Sun, 1 Sep 2019 18:27:52 +0200
Subject: [PATCH] Add test for empty matrix multiplication.

---
 tests/core/empty.rs | 9 +++++++++
 tests/core/mod.rs   | 1 +
 2 files changed, 10 insertions(+)
 create mode 100644 tests/core/empty.rs

diff --git a/tests/core/empty.rs b/tests/core/empty.rs
new file mode 100644
index 00000000..05262cd7
--- /dev/null
+++ b/tests/core/empty.rs
@@ -0,0 +1,9 @@
+use na::{DMatrix, DVector};
+
+#[test]
+fn empty_mul() {
+    // Issue #644
+    let m = DMatrix::<f32>::zeros(8, 0);
+    let v = DVector::<f32>::zeros(0);
+    assert_eq!(m * v, DVector::zeros(8));
+}
\ No newline at end of file
diff --git a/tests/core/mod.rs b/tests/core/mod.rs
index c53493bd..f8c7e477 100644
--- a/tests/core/mod.rs
+++ b/tests/core/mod.rs
@@ -8,6 +8,7 @@ mod matrix_slice;
 #[cfg(feature = "mint")]
 mod mint;
 mod serde;
+mod empty;
 
 
 #[cfg(feature = "arbitrary")]