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X1201: Test indexOf of a List

Use this interface definition to solve this exercise.

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public interface ListADT<E> {
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   // returns number of elements stored
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   public int size();
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​
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   // removes all elements
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   public void clear();
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​
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   // return true if list is empty, false otherwise
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   public boolean isEmpty();
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​
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   // adds e at the end of the list
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   public boolean add(E e);
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​
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   // returns true if o is in the list, false otherwise
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   public boolean contains(Object o);
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​
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   // returns the object at index, returns null if
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   // index is invalid
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   public E get(int index);
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​
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   // returns the index of o if it exists, -1 otherwise
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   public int indexOf(Object o);
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}

Write a test method to test the indexOf() of List<String>. The test infrastructure has an variable named instance of type List<String>. When your test is run, this object has just been allocated. Write at least 3 asserts to test the indexOf() of the instance object. Add some objects, check the indexOf() the objects added as well as some objects not in the list.

Your Answer:

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void testIndexOf()
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{
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    // first simple test
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    assertNotNull(instance);
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    // write three more tests below to test indexOf()
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}
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​
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