import java.util.StringTokenizer;
import junit.framework.TestCase;
import java.io.*;

public class Assign2Test extends TestCase {

  public Assign2Test (String name) {
    super(name);
  }
  
  /**
   * The following 3 check methods create an interpreter object with the
   * specified String as the program, invoke the respective evaluation
   * method (callByValue, callByName, callByNeed), and check that the 
   * result matches the (given) expected output.  If the test fails,
   * the method prints a report as to which test failed and how many
   * points should be deducted.
   */
 
  private void valueCheck(String name, String answer, String program) {
    Interpreter interp = new Interpreter(new StringReader(program));
    assertEquals("by-value " + name, answer, interp.callByValue().toString());
  }

  private void nameCheck(String name, String answer, String program) {
    Interpreter interp = new Interpreter(new StringReader(program));
    assertEquals("by-name " + name, answer, interp.callByName().toString());
  }
   
  private void needCheck(String name, String answer, String program) {
    Interpreter interp = new Interpreter(new StringReader(program));
    assertEquals("by-need " + name, answer, interp.callByNeed().toString());
  }

  private void allCheck(String name, String answer, String program) {
    valueCheck(name, answer, program);
    nameCheck(name, answer, program);
    needCheck(name, answer, program);
  }
 
  

  public void testNumberP() {
    try {
      String output = "number?";
      String input = "number?";
      allCheck("numberP", output, input );

    } catch (Exception e) {
      e.printStackTrace();
      fail("numberP threw " + e);
    }
  } //end of func
  

  public void testMathOp() {
    try {
      String output = "30";
      String input = "2 * 3 + 12";
      allCheck("mathOp", output, input );

    } catch (Exception e) {
      e.printStackTrace();
      fail("mathOp threw " + e);
    }
  } //end of func
  

  public void testParseException() {
    try {
      String output = "haha";
      String input = " 1 +";
      allCheck("parseException", output, input );

         fail("parseException did not throw ParseException exception");
      } catch (ParseException e) {   
         //e.printStackTrace();
      
    } catch (Exception e) {
      e.printStackTrace();
      fail("parseException threw " + e);
    }
  } //end of func
  

  public void testEvalException() {
    try {
      String output = "mojo";
      String input = "1 + number?";
      allCheck("evalException", output, input );

         fail("evalException did not throw EvalException exception");
      } catch (EvalException e) {   
         //e.printStackTrace();
      
    } catch (Exception e) {
      e.printStackTrace();
      fail("evalException threw " + e);
    }
  } //end of func
  

  public void testAppend() {
    try {
      String output = "(1 2 3 1 2 3)";
      String input = "let Y    := map f to              let g := map x to f(map z1,z2 to (x(x))(z1,z2));     in g(g);  APPEND := map ap to            map x,y to               if x = null then y else cons(first(x), ap(rest(x), y)); l      := cons(1,cons(2,cons(3,null))); in (Y(APPEND))(l,l)";
      allCheck("append", output, input );

    } catch (Exception e) {
      e.printStackTrace();
      fail("append threw " + e);
    }
  } //end of func
    

 
}