BAEL-5765 - Adding scan a char unit tests (#12741)

* BAEL-5765 Adding scan a char unit tests

* BAEL-5765 updated class name as per the convention

* BAEL-5765 updated test cases naming strategy

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

@@ -0,0 +1,38 @@
+package com.baeldung.scanner;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Scanner;
+
+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")
+      .append("mno\n")
+      .append("xyz\n")
+      .toString();
+
+    @Test
+    public void givenInputSource_whenScanCharUsingNext_thenOneCharIsRead() {
+        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);
+        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);
+    }
+
+}