SWE 437 In Class Exercise #5
JUnit

Names:

Instructions: Work with your neighbors in groups.

public class InClassTest {
   private EH eh1; private EH eh2; private EH eh3;

   //  Question 1
   @Before public void setUp() { eh1 = new EH(3); eh2 = new EH(5); eh3 = new EH(3); }

   @Test public void noNPE() {...}          // Question 2

   @Test public void equalsFalse() {...}    // Question 3

   @Test public void equalsTrue() {...}     // Question 4

   @Test public void hashConsistent() {...} // Question 5
}
class EH {
   private int x;
   public EH(int x) { this.x = x; }

   @Override public boolean equals(Object obj) {
      if (!(obj instanceof EH)) return false;
      return ((EH) obj).x == this.x;
   }
   // @Override public int hashCode() { return x; }
}

Given the 4 @Test methods shown, how many times does the @Before method execute?

The contract for equals() states that no exceptions may be thrown. Instead, equals() is supposed to return false if passed a null argument.
Write a JUnit test that verifies this property for the EH class.

Using the given EH objects, write a test that verifies that equals() returns false if the objects are, in fact, not equal.

Using the given EH objects, write a test that verifies that equals() returns true if the objects are, in fact, equal.

Using the given EH objects, write a test to verify that hashCode() is consistent with equals. This test should fail if hashCode() is commented out (as shown), but pass if hashCode() is implemented.

SWE 437 In Class Exercise #5 JUnit

SWE 437 In Class Exercise #5
JUnit