Why integration tests verify component interaction in JUnit - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an integration test method that checks if two components interact correctly.

JUnit

public void testComponentInteraction() {
    ComponentA a = new ComponentA();
    ComponentB b = new ComponentB();
    a.setDependency([1]);
    boolean result = a.performAction();
    assertTrue(result);
}

Drag options to blanks, or click blank then click option'

Anew ComponentA()

Bnull

Cb

Dnew Object()

Attempts:

3 left

💡 Hint

Common Mistakes

Passing null instead of the dependent component.

Creating a new instance of the wrong component.

Passing a generic Object instead of the specific component.

The integration test verifies interaction by injecting ComponentB into ComponentA as a dependency.

2fill in blank

medium

Complete the code to assert that the interaction between components returns the expected value.

JUnit

assertEquals([1], a.performAction());

Drag options to blanks, or click blank then click option'

Anull

Bfalse

C0

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using false which indicates failure.

Using null which is not a boolean.

Using 0 which is not a boolean.

The test expects performAction() to return true when components interact correctly.

3fill in blank

hard

Fix the error in the test setup to correctly initialize the components for integration testing.

JUnit

ComponentA a = new ComponentA();
ComponentB b = [1];
a.setDependency(b);

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Anew ComponentB()

Bnull

CComponentB()

Dnew Object()

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning null instead of an instance.

Omitting the new keyword.

Assigning a generic Object instead of the correct component.

The correct way to initialize ComponentB is by using new ComponentB().

4fill in blank

hard

Fill both blanks to complete the integration test that verifies interaction and result.

JUnit

ComponentA a = new ComponentA();
ComponentB b = [1];
a.setDependency(b);
assertEquals([2], a.performAction());

Drag options to blanks, or click blank then click option'

Anew ComponentB()

Btrue

Cfalse

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using false as expected result.

Passing null instead of a component instance.

Mixing up the order of blanks.

The test sets ComponentB as dependency and expects true from performAction().

5fill in blank

hard

Fill all three blanks to complete the integration test that sets up components, performs action, and asserts the result.

JUnit

ComponentA a = new [1]();
ComponentB b = new [2]();
a.setDependency(b);
boolean result = a.[3]();
assertTrue(result);

Drag options to blanks, or click blank then click option'

AComponentA

BComponentB

CperformAction

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong class names for instances.

Using a method name that does not exist.

Forgetting to assert the result.

The test creates instances of ComponentA and ComponentB, sets dependency, calls performAction(), and asserts the result.