ModuloPowerOfTwoTest.java

packagecom.thealgorithms.bitmanipulation;

importstaticorg.junit.jupiter.api.Assertions.assertEquals;
importstaticorg.junit.jupiter.api.Assertions.assertThrows;

importorg.junit.jupiter.params.ParameterizedTest;
importorg.junit.jupiter.params.provider.CsvSource;

classModuloPowerOfTwoTest {

@ParameterizedTest
@CsvSource({
"10, 3, 2",
"15, 2, 3",
"20, 4, 4",
"7, 1, 1",
"5, 1, 1",
"36, 5, 4",
 })
void
testModuloPowerOfTwo(intx, intn, intexpected) {
assertEquals(expected, ModuloPowerOfTwo.moduloPowerOfTwo(x, n));
 }

@ParameterizedTest
@CsvSource({
"10, 0",
"15, -2",
"20, -4",
"7, -1",
"5, -1",
 })
void
testNegativeExponent(intx, intn) {
IllegalArgumentExceptionexception = assertThrows(IllegalArgumentException.class, () -> ModuloPowerOfTwo.moduloPowerOfTwo(x, n));
assertEquals("The exponent must be positive", exception.getMessage());
 }
}