Add tests, remove main in TernarySearch (#5677)

src/test/java/com/thealgorithms/searches/TernarySearchTest.java

@@ -0,0 +1,81 @@
+package com.thealgorithms.searches;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class TernarySearchTest {
+
+    @Test
+    void testFindElementInSortedArray() {
+        Integer[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        TernarySearch search = new TernarySearch();
+
+        int index = search.find(arr, 5);
+
+        assertEquals(4, index, "Should find the element 5 at index 4");
+    }
+
+    @Test
+    void testElementNotFound() {
+        Integer[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        TernarySearch search = new TernarySearch();
+
+        int index = search.find(arr, 11);
+
+        assertEquals(-1, index, "Should return -1 for element 11 which is not present");
+    }
+
+    @Test
+    void testFindFirstElement() {
+        Integer[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        TernarySearch search = new TernarySearch();
+
+        int index = search.find(arr, 1);
+
+        assertEquals(0, index, "Should find the first element 1 at index 0");
+    }
+
+    @Test
+    void testFindLastElement() {
+        Integer[] arr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
+        TernarySearch search = new TernarySearch();
+
+        int index = search.find(arr, 10);
+
+        assertEquals(9, index, "Should find the last element 10 at index 9");
+    }
+
+    @Test
+    void testFindInLargeArray() {
+        Integer[] arr = new Integer[1000];
+        for (int i = 0; i < 1000; i++) {
+            arr[i] = i + 1; // Array from 1 to 1000
+        }
+        TernarySearch search = new TernarySearch();
+
+        int index = search.find(arr, 500);
+
+        assertEquals(499, index, "Should find element 500 at index 499");
+    }
+
+    @Test
+    void testNegativeNumbers() {
+        Integer[] arr = {-10, -5, -3, -1, 0, 1, 3, 5, 7, 10};
+        TernarySearch search = new TernarySearch();
+
+        int index = search.find(arr, -3);
+
+        assertEquals(2, index, "Should find the element -3 at index 2");
+    }
+
+    @Test
+    void testEdgeCaseEmptyArray() {
+        Integer[] arr = {};
+        TernarySearch search = new TernarySearch();
+
+        int index = search.find(arr, 5);
+
+        assertEquals(-1, index, "Should return -1 for an empty array");
+    }
+}