Add hamming distance (#3270)

src/test/java/com/thealgorithms/others/cn/HammingDistanceTest.java

@@ -0,0 +1,76 @@
+package com.thealgorithms.others.cn;
+
+import org.assertj.core.api.Assertions;
+import org.assertj.core.api.ThrowableTypeAssert;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+
+public class HammingDistanceTest {
+
+    HammingDistance hd;
+
+    @BeforeEach
+     void initialize(){
+        hd = new HammingDistance();
+    }
+
+    @Test
+    public void checkForDifferentBits(){
+         String senderBits = "000", receiverBits = "011";
+        int answer = hd.getHammingDistanceBetweenBits(senderBits, receiverBits);
+        Assertions.assertThat(answer).isEqualTo(2);
+    }
+/*
+
+    1 0 1 0 1
+    1 1 1 1 0
+    ----------
+    0 1 0 1 1
+
+
+ */
+    @Test
+    public void checkForDifferentBitsLength(){
+       String senderBits = "10101", receiverBits = "11110";
+        int answer = hd.getHammingDistanceBetweenBits(senderBits, receiverBits);
+        Assertions.assertThat(answer).isEqualTo(3);
+    }
+
+
+    @Test
+    public void checkForSameBits(){
+        String senderBits = "111", receiverBits = "111";
+        int answer = hd.getHammingDistanceBetweenBits(senderBits, receiverBits);
+        Assertions.assertThat(answer).isEqualTo(0);
+    }
+
+    @Test
+    public void checkForLongDataBits(){
+        String senderBits = "10010101101010000100110100", receiverBits = "00110100001011001100110101";
+        int answer = hd.getHammingDistanceBetweenBits(senderBits, receiverBits);
+        Assertions.assertThat(answer).isEqualTo(7);
+    }
+
+    @Test
+    public void mismatchDataBits(){
+        String senderBits = "100010", receiverBits = "00011";
+
+        Exception ex = org.junit.jupiter.api.Assertions.assertThrows(IllegalArgumentException.class, () ->{
+            int answer = hd.getHammingDistanceBetweenBits(senderBits, receiverBits);
+        });
+
+        Assertions.assertThat(ex.getMessage()).contains("bits should be same");
+
+    }
+
+    @Test
+    public void checkForLongDataBitsSame(){
+        String senderBits = "10010101101010000100110100", receiverBits = "10010101101010000100110100";
+        int answer = hd.getHammingDistanceBetweenBits(senderBits, receiverBits);
+        Assertions.assertThat(answer).isEqualTo(0);
+    }
+
+
+
+}