Add tests for CountChar (#3334)

src/main/java/com/thealgorithms/others/CountChar.java

@@ -1,26 +1,15 @@
 package com.thealgorithms.others;
 
-import java.util.Scanner;
-
 public class CountChar {
 
-    public static void main(String[] args) {
-        Scanner input = new Scanner(System.in);
-        System.out.print("Enter your text: ");
-        String str = input.nextLine();
-        input.close();
-        System.out.println(
-            "There are " + CountCharacters(str) + " characters."
-        );
-    }
-
     /**
      * Count non space character in string
      *
      * @param str String to count the characters
      * @return number of character in the specified string
      */
-    private static int CountCharacters(String str) {
+
+    public static int CountCharacters(String str) {
         return str.replaceAll("\\s", "").length();
     }
 }

src/test/java/com/thealgorithms/others/CountCharTest.java

@@ -0,0 +1,17 @@
+package com.thealgorithms.others;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class CountCharTest {
+
+    @Test
+    void testCountCharacters(){
+        String input = "12345";
+        int expectedValue = 5;
+
+        assertEquals(expectedValue, CountChar.CountCharacters(input));
+    }
+
+}