@Test

void testNegativeAndZeroThrowsException() {

Assertions.assertThrows(ArithmeticException.class, () -> GCD.gcd(-1, 0));

}

@Test

void testPositiveAndNegativeThrowsException() {

Assertions.assertThrows(ArithmeticException.class, () -> GCD.gcd(10, -2));

}

@Test

void testBothNegativeThrowsException() {

Assertions.assertThrows(ArithmeticException.class, () -> GCD.gcd(-5, -3));

}

@Test

void testZeroAndPositiveReturnsPositive() {

Assertions.assertEquals(2, GCD.gcd(0, 2));

}

@Test

void testPositiveAndZeroReturnsPositive() {

Assertions.assertEquals(10, GCD.gcd(10, 0));

}

@Test

void testOneAndZeroReturnsOne() {

Assertions.assertEquals(1, GCD.gcd(1, 0));

}

@Test

void testTwoPositiveNumbers() {

Assertions.assertEquals(3, GCD.gcd(9, 6));

}

@Test

void testMultipleArgumentsGcd() {

Assertions.assertEquals(6, GCD.gcd(48, 18, 30, 12));

}

@Test

void testArrayInputGcd() {

Assertions.assertEquals(3, GCD.gcd(new int[] {9, 6}));

}

@Test

void testArrayWithCommonFactor() {

Assertions.assertEquals(5, GCD.gcd(new int[] {2 * 3 * 5 * 7, 2 * 5 * 5 * 5, 2 * 5 * 11, 5 * 5 * 5 * 13}));

}

@Test

void testEmptyArrayReturnsZero() {

Assertions.assertEquals(0, GCD.gcd(new int[] {}));

}

@Test

void testSameNumbers() {

Assertions.assertEquals(7, GCD.gcd(7, 7));

}

@Test

void testPrimeNumbersHaveGcdOne() {

Assertions.assertEquals(1, GCD.gcd(13, 17));

}

@Test

void testSingleElementArrayReturnsElement() {

Assertions.assertEquals(42, GCD.gcd(new int[] {42}));

}

@Test

void testLargeNumbers() {

Assertions.assertEquals(12, GCD.gcd(123456, 789012));

}