Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1. The Suite object is a _____ that executes all of the @Test annotated methods in the test class.

Result
FolderConfigurationTest
FileConfigurationTest
Runner

Discuss Question

Answer: Option D. -> Runner

Suite is under org.junit.runners.Suite, Suite objects are Runners.

Question 2. JUnit Suites are independent of the capability of the ______ system.

Run
Class
Test
Build

Discuss Question

Answer: Option D. -> Build

JUnit Suites are useful to organize tests in Java, independent of the capability of the build system, because it's common for someone or a group other than the developers to maintain builds.

Question 3. What is the purpose of assertArrayEquals("message, A, B)?

Checks that message" is in both A and B
Checks that message" is in A but not B
Checks that message" is in B but not A
Asserts the equality of the A and B arrays

Discuss Question

Answer: Option D. -> Asserts the equality of the A and B arrays

Asserts the equality of the A and B arrays. The "message is displayed to the user.

Question 4. What are fixtures in JUnit?

Objects that specify when to run a test
Fixed state of a set of objects used as a baseline for running tests
Bundle of few test cases run together
Date objects

Discuss Question

Answer: Option B. -> Fixed state of a set of objects used as a baseline for running tests

Tests need to run against the backdrop of set of predefined or known objects. This set of objects is called a test fixture.

Question 5. JUnit test files are written in files with which file extension?

.junit
.test
.java
.unit

Discuss Question

Answer: Option C. -> .java

JUnit test files are regular java files with special methods which are referenced via annotations.

Question 6. To run the file TestClass.class from the command line, we have to type what?

java TestClass
javac TestClass
java org.junit.runner.JUnitCore TestClass
org.junit.runner.JUnitCore TestClass

Discuss Question

Answer: Option C. -> java org.junit.runner.JUnitCore TestClass

The test cases are executed using JUnitCore class which is referenced by "org.junit.runner.JUnitCore.

Question 7. What does the fail() method do in JUnit?

Throws an assertion error unconditionally
Calls the default constructor
Outputs the message Fail" to the console
Pauses the test for 1 second

Discuss Question

Answer: Option A. -> Throws an assertion error unconditionally

The method throws an assertion error unconditionally. This might be helpful to show an incomplete test (maybe still being worked upon) or to ensure that an expected exception is thrown.

Question 8. To listen to events during a test, which class has to be extended?

org.junit.runner.notification.RunListener
org.junit.runner.Listener
org.junit.runner.notification.Listener
org.junit.runner.RunListener

Discuss Question

Answer: Option A. -> org.junit.runner.notification.RunListener

To respond to events during a test run, RunListener is extended and the appropriate methods overridden. If a listener throws an exception during a test event, it is removed for the remainder of the test run.

Question 9. What type of object is returned on completion of a test?