Add Set Kth Bit (#4990)

src/test/java/com/thealgorithms/bitmanipulation/SetKthBitTest.java

@@ -0,0 +1,23 @@
+package com.thealgorithms.bitmanipulation;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class SetKthBitTest {
+
+    @Test
+    void testSetKthBit() {
+        // Test case: Setting the 0th bit in 5 (binary 101)
+        assertEquals(5, SetKthBit.setKthBit(5, 0));
+
+        // Test case: Setting the 2nd bit in 10 (binary 1010)
+        assertEquals(14, SetKthBit.setKthBit(10, 2));
+
+        // Test case: Setting the 3rd bit in 15 (binary 1111)
+        assertEquals(15, SetKthBit.setKthBit(15, 3));
+
+        // Test case: Setting the 1st bit in 0 (binary 0)
+        assertEquals(2, SetKthBit.setKthBit(0, 1));
+    }
+}