initial commit

test/FermatRSAAttackTest.java

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+import org.junit.jupiter.api.*;
+
+import java.math.BigInteger;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class FermatRSAAttackTest
+{
+    @Test
+    public void testExpectExceptionForNegativeNumber()
+    {
+        assertThrows(IllegalArgumentException.class, () -> new FermatRSAAttack(BigInteger.valueOf(-1)));
+    }
+
+    @Test
+    public void testObjectCorrectInitialized()
+    {
+        final var actual = assertDoesNotThrow(() -> new FermatRSAAttack(BigInteger.valueOf(2)));
+
+        final var expectedModul = BigInteger.valueOf(2);
+        final var expectedIterationsCount = 0;
+
+        assertEquals(expectedModul, actual.getMODUL());
+        assertEquals(expectedIterationsCount, actual.getIterationsCount());
+    }
+
+    @Test
+    public void testObjectCorrectInitializedWithLong()
+    {
+        final var actual = assertDoesNotThrow(() -> new FermatRSAAttack(2));
+
+        final var expectedKey = BigInteger.valueOf(2);
+        final var expectedIterationsCount = 0;
+
+        assertEquals(expectedKey, actual.getMODUL());
+        assertEquals(expectedIterationsCount, actual.getIterationsCount());
+    }
+
+    @Test
+    public void testFermatRSAAttack()
+    {
+        final var expectedP1 = 3;
+        final var expectedP2 = 5;
+        final var expectedIterationsCount = 1;
+
+        final var modul = expectedP1 * expectedP2;
+
+        final var fermatRSAAttack = new FermatRSAAttack(modul);
+        final var actualPrimes = fermatRSAAttack.attack(1_000_000);
+
+        assertEquals(expectedP1, actualPrimes.p1().longValue());
+        assertEquals(expectedP2, actualPrimes.p2().longValue());
+        assertEquals(expectedIterationsCount, fermatRSAAttack.getIterationsCount());
+    }
+
+    @Test
+    public void testFermatRSAAttackWithTooFewTries()
+    {
+        assertThrows(FermatRSAAttack.OutOfTriesException.class, () -> {
+            final var fermatRSAAttack = new FermatRSAAttack(10);
+            fermatRSAAttack.attack(1);
+        });
+    }
+}