diff --git a/src/test/java/blogspot/software_and_algorithms/stern_library/optimization/HungarianAlgorithmTest.java b/src/test/java/blogspot/software_and_algorithms/stern_library/optimization/HungarianAlgorithmTest.java
index def50a8..7d588ae 100755
--- a/src/test/java/blogspot/software_and_algorithms/stern_library/optimization/HungarianAlgorithmTest.java
+++ b/src/test/java/blogspot/software_and_algorithms/stern_library/optimization/HungarianAlgorithmTest.java
@@ -93,6 +93,11 @@ public void testInvalidInput() {
           new double[] { 3, Double.POSITIVE_INFINITY } });
       Assert.fail();
     } catch (IllegalArgumentException e) {}
+    try {
+      new HungarianAlgorithm(new double[][] { new double[] { 1, 2 },
+          new double[] { 3, Double.NaN } });
+      Assert.fail();
+    } catch (IllegalArgumentException e) {}
     try {
       new HungarianAlgorithm(new double[][] { new double[] { 1, 2 },
           new double[] { 3, 1.0 / 0.0 } });