How do i achieve full branch coverage on the 3 methods in this class with junit test cases using java and the @test annotation.
public class StringStack {
private int capacity = 10;
private int pointer = 0;
private String[] objects = new String[capacity];
public void push(String o) {
if (pointer >= capacity)
throw new IllegalArgumentException("Stack exceeded capacity!");
objects[pointer++] = o;
}
public String pop() {
if (pointer <= 0)
throw new IllegalArgumentException("Stack empty");
return objects[--pointer];
}
public boolean isEmpty() {
return pointer <= 0;
}
i have written the following test casses and i have achieved this for the isEmpty() method although i am struggling to write test cases for the other two methods because they both return object pointers and i do not know how to initialize that in my test file.
class squareTest {
//1.
@Test
public void push() {
StringStack push1 = new StringStack();
String e2 = push1.pop();
try {
Assert.fail( "Should have thrown an exception" );
assertEquals(IllegalArgumentException("Stack empty"), e2);
//java.lang.IllegalArgumentException: Stack empty
}catch (Exception e) {
String expmessage = "I should get this message";
}
}
@Test
public void testTC3()
{
try {
StringStack.push(o);
fail(); // if we got here, no exception was thrown, which is bad
}
catch (Exception e) {
final String expected = "Legal Values: Package Type must be P or R";
assertEquals( expected, e.getMessage());
}
}
//3.EMPTY TEST CASES
@Test
public void empty()
{
StringStack test2 = new StringStack();
boolean e1 = test2.isEmpty();
assertEquals(true, e1);
}
@Test
public void notEmpty()
{
StringStack test3 = new StringStack();
boolean ne1 = test3.equals("im not empty");
assertEquals(false, ne1);
}
}
I will give you an example for the first function
public void push(String o) {
if (pointer >= capacity)
throw new IllegalArgumentException("Stack exceeded capacity!");
objects[pointer++] = o;
}
You need 3 unity tests to fully cover this one
For branch coverage you need only 1 and 3 or 2 and 3 though I would suggest all three for critical pieces of functionality.
Maybe below test while help to get full coverage.
push method test
pointer >= capacity
@Test(exception = IllegalArgumentException.class) public void push_PointerGreaterThanCapacity_ExceptionThrow(){ WhiteBox.setInternalState(yourObject, "pointer",11); String inputString = "Hello"; yourObject.push(inputString); }
pointer < capacity
@Test public void push_PointerSmallerThanCapacity_ExceptionThrow(){ String inputString = "Hello"; yourObject.push(inputString); int pointer = WhiteBox.getInternalState(yourObject,"pointer"); String[] objects = WhiteBox.getInternalState(yourObject,"objects"); assertEquals(inputString, objects[pointer-1]); }
pop method test
pointer < 0
@Test(exception = IllegalArgumentException.class) public void pop_PointerNegative_ExceptionThrow(){ WhiteBox.setInternalState(yourObject, "pointer",-1); String inputString = "Hello"; yourObject.push(inputString); }
pointer > 0
@Test public void pop_pointerGreaterThenZero_PopValue(){ //set pointer WhiteBox.setInternalState(yourObject, "pointer",2); String[] stringList = {"String0","String1","String2"}; //object array WhiteBox.setInternalState(yourObject, "objects",stringList); String actualOutput = yourObject.pop(); assertEquals(actualOutput, stringList[1]); }
Here, yourObject is the object of class which one you test.
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