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Add mobius function (#3241)

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This commit is contained in:
Akshay Dubey
2022-09-03 12:04:06 +05:30
committed by GitHub
parent 6cfb628487
commit 69d0070c99
2 changed files with 120 additions and 0 deletions
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src/test/java/com/thealgorithms/maths/MobiusFunctionTest.java Normal file
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package com.thealgorithms.maths;
import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
class MobiusFunctionTest {
@Test
void testMobiusForZero() {
//given
int number = 0;
String expectedMessage = "Number must be greater than zero.";
//when
Exception exception = assertThrows(IllegalArgumentException.class, () -> {
MobiusFunction.mobius(number);
});
String actualMessage = exception.getMessage();
//then
assertEquals(expectedMessage, actualMessage);
}
@Test
void testMobiusForNegativeNumber() {
//given
int number = -1;
String expectedMessage = "Number must be greater than zero.";
//when
Exception exception = assertThrows(IllegalArgumentException.class, () -> {
MobiusFunction.mobius(number);
});
String actualMessage = exception.getMessage();
//then
assertEquals(expectedMessage, actualMessage);
}
@Test
void testMobiusFunction(){
int[] expectedResultArray = {
1, -1, -1, 0, -1, 1, -1, 0, 0, 1, -1, 0, -1, 1, 1, 0, -1, 0, -1, 0, 1, 1, -1, 0,
0, 1, 0, 0, -1, -1, -1, 0, 1, 1, 1, 0, -1, 1, 1, 0, -1, -1, -1, 0, 0, 1, -1, 0, 0,
0, 1, 0, -1, 0, 1, 0, 1, 1, -1, 0, -1, 1, 0, 0, 1, -1, -1, 0, 1, -1, -1, 0, -1, 1,
0, 0, 1, -1, -1, 0, 0, 1, -1, 0, 1, 1, 1, 0, -1, 0, 1, 0, 1, 1, 1, 0, -1, 0, 0, 0
};
for(int i = 1; i <= 100; i++) {
//given
int expectedValue = expectedResultArray[i-1];
//when
int actualValue = MobiusFunction.mobius(i);
//then
assertEquals(expectedValue,actualValue);
}
}
}