Change package declaration in StochasticMatrixTest

Author: Dsannue

src/test/java/com/thealgorithms/StochasticMatrixTest.java

@@ -0,0 +1,35 @@
+package com.thealgorithms.matrix;
+
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
+
+class StochasticMatrixTest {
+
+    @Test
+    void testRowStochasticMatrix() {
+        double[][] matrix = {
+            {0.2, 0.5, 0.3},
+            {0.1, 0.6, 0.3}
+        };
+        assertTrue(StochasticMatrix.isRowStochastic(matrix));
+        assertFalse(StochasticMatrix.isColumnStochastic(matrix));
+    }
+
+    @Test
+    void testColumnStochasticMatrix() {
+        double[][] matrix = {
+            {0.4, 0.2},
+            {0.6, 0.8}
+        };
+        assertTrue(StochasticMatrix.isColumnStochastic(matrix));
+    }
+
+    @Test
+    void testInvalidMatrix() {
+        double[][] matrix = {
+            {0.5, -0.5},
+            {0.5, 1.5}
+        };
+        assertFalse(StochasticMatrix.isRowStochastic(matrix));
+    }
+}