Replace System.out with logger in unit tests

Author: Sourov72

core-java-modules/core-java-string-conversions-4/EBCDIC_to_ASCII/unit_test.java

@@ -1,75 +1,76 @@
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import java.io.*;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 
 public class EBCDICConversionTest {
-
+    private static final Logger logger = LoggerFactory.getLogger(EBCDICConversionTest.class);
+    
     public static void main(String[] args) throws Exception {
         testBasicEBCDICToAsciiExample();
         testStepByStepConversion();
         testFileBasedConversion();
         testStreamingConversion();
-        System.out.println("✅ All tests passed!");
+        logger.info("✅ All tests passed!");
     }
-
+    
     static void assertEquals(String expected, String actual) {
         if (!expected.equals(actual)) {
             throw new AssertionError("Expected: [" + expected + "], but got: [" + actual + "]");
         }
     }
-
+    
     static void testBasicEBCDICToAsciiExample() {
         // Example: EBCDIC bytes for "ABC" (in Cp037)
         byte[] ebcdicBytes = new byte[] { (byte) 0xC1, (byte) 0xC2, (byte) 0xC3 };
         String text = new String(ebcdicBytes, Charset.forName("Cp037"));
-        System.out.println("Decoded text: " + text);
+        logger.info("Decoded text: {}", text);
         assertEquals("ABC", text);
     }
-
+    
     static void testStepByStepConversion() {
         // Example EBCDIC bytes ("Hello" in Cp037)
         byte[] ebcdicData = { (byte) 0xC8, (byte) 0x85, (byte) 0x93, (byte) 0x93, (byte) 0x96 };
         String unicodeText = new String(ebcdicData, Charset.forName("Cp037"));
         assertEquals("Hello", unicodeText);
-
+        
         byte[] asciiData = unicodeText.getBytes(StandardCharsets.US_ASCII);
         assertEquals("Hello", new String(asciiData, StandardCharsets.US_ASCII));
-
-        System.out.println("Step-by-step conversion OK: " + new String(asciiData));
+        logger.info("Step-by-step conversion OK: {}", new String(asciiData));
     }
-
+    
     static void testFileBasedConversion() throws Exception {
         File tempFile = File.createTempFile("input", ".ebc");
         tempFile.deleteOnExit();
-
+        
         // "TEST" in Cp037 (all uppercase)
         byte[] ebcdicData = { (byte) 0xE3, (byte) 0xC5, (byte) 0xE2, (byte) 0xE3 };
         try (FileOutputStream fos = new FileOutputStream(tempFile)) {
             fos.write(ebcdicData);
         }
-
+        
         byte[] rawBytes = new FileInputStream(tempFile).readAllBytes();
         String unicodeText = new String(rawBytes, Charset.forName("Cp037"));
         assertEquals("TEST", unicodeText);
-
+        
         byte[] asciiData = unicodeText.getBytes(StandardCharsets.US_ASCII);
         assertEquals("TEST", new String(asciiData, StandardCharsets.US_ASCII));
-
-        System.out.println("File-based conversion OK: " + unicodeText);
+        logger.info("File-based conversion OK: {}", unicodeText);
     }
-
+    
     static void testStreamingConversion() throws IOException {
         File input = File.createTempFile("input", ".ebc");
         File output = File.createTempFile("output", ".txt");
         input.deleteOnExit();
         output.deleteOnExit();
-
+        
         // "JAVA" in Cp037 (all uppercase)
         byte[] ebcdicData = { (byte) 0xD1, (byte) 0xC1, (byte) 0xE5, (byte) 0xC1 };
         try (FileOutputStream fos = new FileOutputStream(input)) {
             fos.write(ebcdicData);
         }
-
+        
         try (
             InputStreamReader reader = new InputStreamReader(
                 new FileInputStream(input),
@@ -86,13 +87,12 @@ static void testStreamingConversion() throws IOException {
                 writer.write(buffer, 0, length);
             }
         }
-
+        
         String result = new String(
             new FileInputStream(output).readAllBytes(),
             StandardCharsets.US_ASCII
         );
         assertEquals("JAVA", result);
-
-        System.out.println("Streaming conversion OK: " + result);
+        logger.info("Streaming conversion OK: {}", result);
     }
 }