BcdConversionTest.java

packagecom.thealgorithms.bitmanipulation;

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

importorg.junit.jupiter.api.Test;

publicclassBcdConversionTest {

@Test
publicvoidtestBcdToDecimal() {
intdecimal = BcdConversion.bcdToDecimal(0x1234);
assertEquals(1234, decimal); // BCD 0x1234 should convert to decimal 1234
 }

@Test
publicvoidtestDecimalToBcd() {
intbcd = BcdConversion.decimalToBcd(1234);
assertEquals(0x1234, bcd); // Decimal 1234 should convert to BCD 0x1234
 }

@Test
publicvoidtestBcdToDecimalZero() {
intdecimal = BcdConversion.bcdToDecimal(0x0);
assertEquals(0, decimal); // BCD 0x0 should convert to decimal 0
 }

@Test
publicvoidtestDecimalToBcdZero() {
intbcd = BcdConversion.decimalToBcd(0);
assertEquals(0x0, bcd); // Decimal 0 should convert to BCD 0x0
 }

@Test
publicvoidtestBcdToDecimalSingleDigit() {
intdecimal = BcdConversion.bcdToDecimal(0x7);
assertEquals(7, decimal); // BCD 0x7 should convert to decimal 7
 }

@Test
publicvoidtestDecimalToBcdSingleDigit() {
intbcd = BcdConversion.decimalToBcd(7);
assertEquals(0x7, bcd); // Decimal 7 should convert to BCD 0x7
 }

@Test
publicvoidtestBcdToDecimalMaxValue() {
intdecimal = BcdConversion.bcdToDecimal(0x9999);
assertEquals(9999, decimal); // BCD 0x9999 should convert to decimal 9999
 }

@Test
publicvoidtestDecimalToBcdMaxValue() {
intbcd = BcdConversion.decimalToBcd(9999);
assertEquals(0x9999, bcd); // Decimal 9999 should convert to BCD 0x9999
 }

@Test
publicvoidtestBcdToDecimalInvalidHighDigit() {
// Testing invalid BCD input where one of the digits is > 9
assertThrows(IllegalArgumentException.class, () -> {
BcdConversion.bcdToDecimal(0x123A); // Invalid BCD, 'A' is not a valid digit
 });
 }

@Test
publicvoidtestDecimalToBcdInvalidValue() {
// Testing conversion for numbers greater than 9999, which cannot be represented in BCD
assertThrows(IllegalArgumentException.class, () -> {
BcdConversion.decimalToBcd(10000); // 10000 is too large for BCD representation
 });
 }

@Test
publicvoidtestBcdToDecimalLeadingZeroes() {
intdecimal = BcdConversion.bcdToDecimal(0x0234);
assertEquals(234, decimal); // BCD 0x0234 should convert to decimal 234, ignoring leading zero
 }

@Test
publicvoidtestDecimalToBcdLeadingZeroes() {
intbcd = BcdConversion.decimalToBcd(234);
assertEquals(0x0234, bcd); // Decimal 234 should convert to BCD 0x0234
 }
}