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Unit Tests

The first step in refactoring is to create unit tests that verify the basic functionality. If you're doing Extreme Programming (XP) with incremental, test-first programming, those tests exist already as a by-product of that process.

The following test requires a file named template.html that contains the text "xxx%CODE%yyy%ALTCODE%zzz".

import java.io.*;
import junit.framework.*;

public class CodeReplacerTest extends TestCase {
  CodeReplacer replacer;

  public CodeReplacerTest(String testName){super(testName);}

  protected void setUp() {replacer = new CodeReplacer();}

  public void testTemplateLoadedProperly() {
    try {
                    new PrintWriter(new StringWriter()));
    } catch (Exception ex) {
      fail("No exception expected, but saw:" + ex);


  public void testSubstitution() {
    StringWriter stringOut = new StringWriter();
    PrintWriter testOut = new PrintWriter (stringOut);
    String trackingId = "01234567";
    try {
      replacer.substitute(trackingId, testOut);
    } catch (IOException ex) {
      fail ("testSubstitution exception - " + ex);


This code uses the JUnit unit-testing framework introduced in the previous chapter.

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