Add JUnit test for MajorityElement

Author: Adi

src/searching/MajorityElement.java

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+package searching;
+
+/**
+ * LeetCode Problem 169: Majority Element
+ * Boyer-Moore Voting Algorithm
+ */
+public class MajorityElement {
+    public static int findMajority(int[] nums) {
+        int count = 0;
+        Integer candidate = null;
+
+        for (int num : nums) {
+            if (count == 0) {
+                candidate = num;
+            }
+            count += (num == candidate) ? 1 : -1;
+        }
+
+        return candidate;
+    }
+
+    public static void main(String[] args) {
+        int[] nums = {2, 2, 1, 1, 1, 2, 2};
+        System.out.println("Majority element: " + findMajority(nums));
+    }
+}

src/test/java/search/MajorityElementTest.java

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+package search;
+
+import searching.MajorityElement;
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+
+public class MajorityElementTest {
+
+    @Test
+    public void testMajorityElement1() {
+        int[] nums = {3, 3, 4, 2, 3, 3, 3};
+        assertEquals(3, MajorityElement.findMajority(nums));
+    }
+
+    @Test
+    public void testMajorityElement2() {
+        int[] nums = {2, 2, 1, 1, 2, 2};
+        assertEquals(2, MajorityElement.findMajority(nums));
+    }
+
+    @Test
+    public void testMajorityElementSingle() {
+        int[] nums = {1};
+        assertEquals(1, MajorityElement.findMajority(nums));
+    }
+}