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refactor: Enhance docs, code, add tests in KrishnaMurthyNumber (#6742)

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* refactor: Enhance docs, code, add tests in `KrishnaMurthyNumber`

* Lint
This commit is contained in:
Hardik Pawar
2025-10-13 01:34:32 +05:30
committed by GitHub
parent 9a907c8843
commit 74ddea6747
3 changed files with 112 additions and 74 deletions
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86
src/test/java/com/thealgorithms/maths/KrishnamurthyNumberTest.java
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@@ -6,57 +6,115 @@ import static org.junit.jupiter.api.Assertions.assertTrue;
import org.junit.jupiter.api.Test;
/**
* Unit tests for the KrishnamurthyNumber class.
* Unit tests for the {@link KrishnamurthyNumber} class.
*/
public class KrishnamurthyNumberTest {
class KrishnamurthyNumberTest {
/**
* Test the isKrishnamurthy method with a known Krishnamurthy number.
* Test with known Krishnamurthy number 145.
* 1! + 4! + 5! = 1 + 24 + 120 = 145
*/
@Test
public void testIsKrishnamurthyTrue() {
void testIsKrishnamurthyWith145() {
assertTrue(KrishnamurthyNumber.isKrishnamurthy(145));
}
/**
* Test the isKrishnamurthy method with a number that is not a Krishnamurthy number.
* Test with a number that is not a Krishnamurthy number.
*/
@Test
public void testIsKrishnamurthyFalse() {
void testIsKrishnamurthyWithNonKrishnamurthyNumber() {
assertFalse(KrishnamurthyNumber.isKrishnamurthy(123));
}
/**
* Test the isKrishnamurthy method with zero.
* Test with zero, which is not a Krishnamurthy number.
*/
@Test
public void testIsKrishnamurthyZero() {
void testIsKrishnamurthyWithZero() {
assertFalse(KrishnamurthyNumber.isKrishnamurthy(0));
}
/**
* Test the isKrishnamurthy method with a negative number.
* Test with negative numbers, which cannot be Krishnamurthy numbers.
*/
@Test
public void testIsKrishnamurthyNegative() {
void testIsKrishnamurthyWithNegativeNumbers() {
assertFalse(KrishnamurthyNumber.isKrishnamurthy(-1));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(-145));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(-100));
}
/**
* Test the isKrishnamurthy method with a single-digit Krishnamurthy number.
* Test with single-digit Krishnamurthy numbers.
* 1! = 1 and 2! = 2, so both 1 and 2 are Krishnamurthy numbers.
*/
@Test
public void testIsKrishnamurthySingleDigitTrue() {
void testIsKrishnamurthyWithSingleDigitKrishnamurthyNumbers() {
assertTrue(KrishnamurthyNumber.isKrishnamurthy(1));
assertTrue(KrishnamurthyNumber.isKrishnamurthy(2));
}
/**
* Test the isKrishnamurthy method with a single-digit number that is not a Krishnamurthy number.
* Test with single-digit numbers that are not Krishnamurthy numbers.
*/
@Test
public void testIsKrishnamurthySingleDigitFalse() {
void testIsKrishnamurthyWithSingleDigitNonKrishnamurthyNumbers() {
assertFalse(KrishnamurthyNumber.isKrishnamurthy(3));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(4));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(5));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(6));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(7));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(8));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(9));
}
/**
* Test with the largest Krishnamurthy number: 40585.
* 4! + 0! + 5! + 8! + 5! = 24 + 1 + 120 + 40320 + 120 = 40585
*/
@Test
void testIsKrishnamurthyWithLargestKrishnamurthyNumber() {
assertTrue(KrishnamurthyNumber.isKrishnamurthy(40585));
}
/**
* Test with various non-Krishnamurthy numbers.
*/
@Test
void testIsKrishnamurthyWithVariousNonKrishnamurthyNumbers() {
assertFalse(KrishnamurthyNumber.isKrishnamurthy(10));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(50));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(100));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(144));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(146));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(150));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(200));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(999));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(1000));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(40584));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(40586));
}
/**
* Test with numbers close to known Krishnamurthy numbers.
*/
@Test
void testIsKrishnamurthyWithNumbersCloseToKrishnamurthy() {
assertFalse(KrishnamurthyNumber.isKrishnamurthy(144));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(146));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(40584));
assertFalse(KrishnamurthyNumber.isKrishnamurthy(40586));
}
/**
* Test with all known Krishnamurthy numbers in base 10.
*/
@Test
void testAllKnownKrishnamurthyNumbers() {
assertTrue(KrishnamurthyNumber.isKrishnamurthy(1));
assertTrue(KrishnamurthyNumber.isKrishnamurthy(2));
assertTrue(KrishnamurthyNumber.isKrishnamurthy(145));
assertTrue(KrishnamurthyNumber.isKrishnamurthy(40585));
}
}