JUnit5 assertThrows NeuronSquareMesh2DTest (#216)

commons-math-neuralnet/src/test/java/org/apache/commons/math4/neuralnet/twod/NeuronSquareMesh2DTest.java

@@ -36,32 +36,37 @@ import org.apache.commons.math4.neuralnet.Network;
 import org.apache.commons.math4.neuralnet.Neuron;
 import org.apache.commons.math4.neuralnet.SquareNeighbourhood;
 
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
 /**
  * Tests for {@link NeuronSquareMesh2D} and {@link Network} functionality for
  * a two-dimensional network.
  */
 public class NeuronSquareMesh2DTest {
+
     private final UniformRandomProvider rng = RandomSource.SPLIT_MIX_64.create();
     private final FeatureInitializer init = FeatureInitializerFactory.uniform(rng, 0, 2);
 
-    @Test(expected = IllegalArgumentException.class)
+    @Test
     public void testMinimalNetworkSize1() {
         final FeatureInitializer[] initArray = {init};
 
+        assertThrows(IllegalArgumentException.class, () ->
                 new NeuronSquareMesh2D(1, false,
                                        2, false,
                                        SquareNeighbourhood.VON_NEUMANN,
-                               initArray);
+                                       initArray));
     }
 
-    @Test(expected = IllegalArgumentException.class)
+    @Test
     public void testMinimalNetworkSize2() {
         final FeatureInitializer[] initArray = {init};
 
+        assertThrows(IllegalArgumentException.class, () ->
                 new NeuronSquareMesh2D(2, false,
                                        0, false,
                                        SquareNeighbourhood.VON_NEUMANN,
-                               initArray);
+                                       initArray));
     }
 
     @Test
@@ -887,4 +892,5 @@ public class NeuronSquareMesh2DTest {
             }
         }
     }
+
 }