BAEL-5765 - Updating scan a char unit tests (#12751)

* BAEL-5765 Adding scan a char unit tests

* BAEL-5765 updated class name as per the convention

* BAEL-5765 updated test cases naming strategy

* BAEL-5765 updated variable name

core-java-modules/core-java-io-apis-2/src/test/java/com/baeldung/scanner/ScanACharacterUnitTest.java

@@ -9,30 +9,30 @@ import org.junit.jupiter.api.Test;
 public class ScanACharacterUnitTest {
 
     // given - input scanner source, no need to scan from console
-    String Input = new StringBuilder().append("abc\n")
+    String input = new StringBuilder().append("abc\n")
       .append("mno\n")
       .append("xyz\n")
       .toString();
 
     @Test
     public void givenInputSource_whenScanCharUsingNext_thenOneCharIsRead() {
-        Scanner sc = new Scanner(Input);
+        Scanner sc = new Scanner(input);
         char c = sc.next().charAt(0);
         assertEquals('a', c);
     }
 
     @Test
     public void givenInputSource_whenScanCharUsingFindInLine_thenOneCharIsRead() {
-        Scanner sc = new Scanner(Input);
+        Scanner sc = new Scanner(input);
         char c = sc.findInLine(".").charAt(0);
         assertEquals('a', c);
     }
 
     @Test
     public void givenInputSource_whenScanCharUsingUseDelimiter_thenOneCharIsRead() {
-        Scanner sc = new Scanner(Input);
-        String c = sc.useDelimiter("").next();
-        assertEquals("a", c);
+        Scanner sc = new Scanner(input);
+        char c = sc.useDelimiter("").next().charAt(0);
+        assertEquals('a', c);
     }
 
 }