new unit test

src/test/java/de/tilman_neumann/jml/squareSums/FourSquaresFinderTest.java

@@ -0,0 +1,48 @@
+/*
+ * java-math-library is a Java library focused on number theory, but not necessarily limited to it. It is based on the PSIQS 4.0 factoring project.
+ * Copyright (C) 2018-2024 Tilman Neumann - tilman.neumann@web.de
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with this program;
+ * if not, see <http://www.gnu.org/licenses/>.
+ */
+package de.tilman_neumann.jml.squareSums;
+
+import static org.junit.Assert.assertEquals;
+
+import java.math.BigInteger;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import de.tilman_neumann.util.ConfigUtil;
+
+/**
+ * Tests for the FourSquaresFinder.
+ * @author Tilman Neumann
+ */
+public class FourSquaresFinderTest {
+
+	@Before
+	public void setup() {
+		ConfigUtil.initProject();
+	}
+
+	@Test
+	public void testRSA100() {
+		BigInteger rsa100 = new BigInteger("1522605027922533360535618378132637429718068114961380688657908494580122963258952897654000350692006139"); // 330 bit
+    	FourSquaresFinder fsf = new FourSquaresFinder();
+    	fsf.find(rsa100);
+    	BigInteger[] result = fsf.getSquareBases();
+    	BigInteger x = result[0];
+    	BigInteger y = result[1];
+    	BigInteger z = result[2];
+    	BigInteger w = result[3];
+    	assertEquals(rsa100, x.multiply(x).add(y.multiply(y)).add(z.multiply(z)).add(w.multiply(w)));
+	}
+}