Fix

Author: Hardvan

src/test/java/com/thealgorithms/conversions/HexaDecimalToBinaryTest.java

@@ -5,29 +5,41 @@
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.CsvSource;
 
+/**
+ * Unit tests for the {@link EndianConverter} class.
+ */
 public class HexaDecimalToBinaryTest {
 
-    private final HexaDecimalToBinary converter = new HexaDecimalToBinary();
-
-    @ParameterizedTest
-    @CsvSource({"1, 00000001", "A1, 10100001", "EF, 11101111", "BA, 10111010", "7, 00000111", "F, 00001111", "7FFFFFFF, 1111111111111111111111111111111", "ABCDEF, 101010111100110111101111"})
-    public void testHexaDecimalToBinary(String hexInput, String expectedBinary) {
-        assertEquals(expectedBinary, converter.convert(hexInput));
-    }
-
+    /**
+     * Parameterized test to validate the conversion from little-endian to big-endian.
+     * Hexadecimal values are passed as strings and converted to integers during the test.
+     */
     @ParameterizedTest
-    @CsvSource({"0, 00000000", "2, 00000010", "3, 00000011"})
-    public void testPaddingWithLeadingZeros(String hexInput, String expectedBinary) {
-        assertEquals(expectedBinary, converter.convert(hexInput));
+    @CsvSource({
+        "0x78563412, 0x12345678", "0x00000000, 0x00000000", "0x00000001, 0x01000000",
+        "0xFFFFFFFF, 0xFFFFFFFF", // -1 in two's complement
+        "0x0000007F, 0x7F000000" // Positive boundary case
+    })
+    public void
+    testLittleToBigEndian(String inputHex, String expectedHex) {
+        int input = (int) Long.parseLong(inputHex.substring(2), 16); // Convert hex string to int
+        int expected = (int) Long.parseLong(expectedHex.substring(2), 16); // Convert hex string to int
+        assertEquals(expected, EndianConverter.littleToBigEndian(input));
     }
 
+    /**
+     * Parameterized test to validate the conversion from big-endian to little-endian.
+     */
     @ParameterizedTest
-    @CsvSource({"G, NumberFormatException", "ZZ, NumberFormatException"})
-    public void testInvalidHexInput(String hexInput, String expectedException) {
-        try {
-            converter.convert(hexInput);
-        } catch (NumberFormatException e) {
-            assertEquals(expectedException, e.getClass().getSimpleName());
-        }
+    @CsvSource({
+        "0x12345678, 0x78563412", "0x00000000, 0x00000000", "0x01000000, 0x00000001",
+        "0xFFFFFFFF, 0xFFFFFFFF", // -1 in two's complement
+        "0x7F000000, 0x0000007F" // Positive boundary case
+    })
+    public void
+    testBigToLittleEndian(String inputHex, String expectedHex) {
+        int input = (int) Long.parseLong(inputHex.substring(2), 16); // Convert hex string to int
+        int expected = (int) Long.parseLong(expectedHex.substring(2), 16); // Convert hex string to int
+        assertEquals(expected, EndianConverter.bigToLittleEndian(input));
     }
 }