Updated libraries and increased test coverage

src/test/java/com/mattrixwv/matrix/TestBigIntegerMatrix.java

@@ -1,7 +1,7 @@
 //Matrix/src/test/java/com/mattrixwv/matrix/TestBigBigIntegerMatrix.java
 //Mattrixwv
 // Created: 02-10-22
-//Modified: 07-09-22
+//Modified: 04-13-23
 package com.mattrixwv.matrix;
 
 
@@ -200,8 +200,8 @@ public class TestBigIntegerMatrix{
 	public void testEquals(){
 		//Invalid equals
 		BigIntegerMatrix matrix = new BigIntegerMatrix(grid1);
-		assertNotEquals(null, matrix);
-		assertNotEquals(new int[0], matrix);
+		assertNotEquals(matrix, null);
+		assertNotEquals(matrix, new int[0]);
 
 		//1x1
 		boolean gridEquals = matrix.equals(matrix);
@@ -1858,4 +1858,38 @@ public class TestBigIntegerMatrix{
 		String matrixString = "[1,2,3]\n[1,2,3]\n[1,2,3]";
 		assertEquals(matrixString, matrix.toString());
 	}
+
+	@Test
+	public void testLaplaceExpansionHelper(){
+		BigIntegerMatrixPublic matrix = new BigIntegerMatrixPublic();
+		matrix.addRow(grid2[0]);
+		assertThrows(InvalidGeometryException.class, () -> {
+			matrix.laplaceExpansionHelper(0, 0);
+		});
+
+		BigIntegerMatrixPublic matrix2 = new BigIntegerMatrixPublic();
+		matrix2.setGrid(grid1);
+		assertThrows(InvalidGeometryException.class, () -> {
+			matrix2.laplaceExpansionHelper(0, 0);
+		});
+
+		BigIntegerMatrixPublic matrix3 = new BigIntegerMatrixPublic();
+		matrix3.setGrid(grid2);
+		assertThrows(InvalidCoordinatesException.class, () -> {
+			matrix3.laplaceExpansionHelper(-1, 0);
+		});
+		assertThrows(InvalidCoordinatesException.class, () -> {
+			matrix3.laplaceExpansionHelper(2, 0);
+		});
+		assertThrows(InvalidCoordinatesException.class, () -> {
+			matrix3.laplaceExpansionHelper(0, -1);
+		});
+		assertThrows(InvalidCoordinatesException.class, () -> {
+			matrix3.laplaceExpansionHelper(0, 2);
+		});
+	}
+
+
+	private class BigIntegerMatrixPublic extends BigIntegerMatrix{
+	}
 }