package calccheck;
import org.junit.*;
import static org.junit.Assert.*;
import java.util.*;

public class JUnitTest{

 private Stack<Double> linkedStack;
 private Stack<Double> arrayStack;

 @Before
 public void setUp(){
  linkedStack = new LinkedStack<Double>();
  arrayStack = new ArraybasedStack<Double>();
 }
 
 @Test
 public void testEmptyLinkedStack(){
  assertTrue(linkedStack.isEmpty());
 }
 
 @Test
 public void testPushItemToLinkedStack(){
  linkedStack.push(1);
  assertEquals(1, linkedStack.getSize());
 }
 
 @Test
 public void testPushItemToArraybasedStack(){
  arrayStack.push(1);
  assertEquals(1, arrayStack.getSize());
 }
 
 @Test
 public void testPopItemFromLinkedStack(){
  arrayStack.push(1);
  linkedStack.pop();
  assertEquals(0, arrayStack.getSize());
 }
 
 @Test(expected = RuntimeException.class)
 public void testPopFromEmptyLinkedStack(){
  Stack<Double> emptyLinkedStack = new LinkedStack<Double>();
  emptyLinkedStack.pop();
 }
 
 @Test(expected = RuntimeException.class)
 public void testPopFromEmptyArrayStack(){
  Stack<Double> emptyArrayStack = new ArraybasedStack<Double>();
  emptyArrayStack.pop();
 }
 
 @Test(expected = RuntimeException.class)
 public void testPushToFullArrayStack(){
  while(!arrayStack.isFull()){arrayStack.push(1);}
  arrayStack.push(2);
 }
 
 @Test(expected = SyntaxError.class)
 public void testIncorrectPostfix[removed]){
  RPNCalculator.calc({1, 2, 3, +});
 }
 
// intentionally left out when writing RPNCalculator
 @Test(expected = Exception.class)
 public void testDivisionPerZero(){
  RPNCalculator.calc({1, 0, "/"});
 }
 
 @Test
 public void testRPNResult(){
  double result = RPNCalculator.calc({1.5, 2, +, 3, 4, -, *});
  assertEquals(-3.5, result);
 }
 
 public static junit.framework.Test suite(){
        return new junit.framework.JUnit4TestAdapter(JUnitTest.class);
    }
 
 public static void main(String args[]) {
      org.junit.runner.JUnitCore.main("calccheck.JUnitTest");
    }
}