JExprParserTest.java from DrJava at Krugle

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package edu.rice.cs.javalanglevels;

import java.io.*;

import edu.rice.cs.javalanglevels.tree.*;
import edu.rice.cs.javalanglevels.parser.*;

import junit.framework.TestCase;

/**
 * Test the JExprParser by trying to parse all files in the testFiles directory that end in .test,
 * writing the output to a file of the same name ending in .actual, and comparing that file to 
 * the file of the same name in the testFiles directory that ends with .expected
 */
public class JExprParserTest extends TestCase {
  
  /**
   * Takes an array of test files and feeds them into the JExprParser.  These files should
   * succeed.
   */
  public void testParseSucceeds() throws IOException, ParseException {
    File directory = new File("testFiles");

    File[] testFiles = directory.listFiles(new FileFilter() {
      public boolean accept(File pathName) {
        return pathName.getAbsolutePath().endsWith(".test");
      }
    });

    for(int i = 0; i < testFiles.length; i++) {
      File currFile = testFiles[i];
      SourceFile sf = null;
      try {
        sf = new JExprParser(currFile).SourceFile();
      }
      catch (ParseException pe) {
        throw pe;
      }

      String path2 = currFile.getAbsolutePath();
      int indexOfLastDot2 = path2.lastIndexOf('.');
      String newPath2 = path2.substring(0, indexOfLastDot2) + ".actual";
      FileWriter fw = new FileWriter(newPath2);
      fw.write(sf.toString());
      fw.close();
      
      // Get the corresponding expected String value for the toString of the SourceFile.
      String path = currFile.getAbsolutePath();
      int indexOfLastDot = path.lastIndexOf('.');
      String newPath = path.substring(0, indexOfLastDot) + ".expected";
      File f = new File(newPath);
      String text = readFileAsString(f);
      assertEquals("The resulting SourceFile generated from " + currFile + " is not correct.", text, sf.toString());
    }
  }

  /**
   * Read the entire contents of a file and return them.  Copied from DrJava's FileOps.
   */
  public static String readFileAsString(final File file) throws IOException {
    FileReader reader = new FileReader(file);
    StringBuffer buf = new StringBuffer();

    while (reader.ready()) {
      char c = (char) reader.read();
      buf.append(c);
    }

    reader.close();
    return buf.toString();
  }
}
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