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JUnit Multiple-Choice Questions (MCQs)

JUnit is a unit testing framework for the Java programming language.

JUnit MCQs: This section contains multiple-choice questions and answers on the various topics of JUnit. Practice these MCQs to test and enhance your skills on JUnit.

List of JUnit MCQs

1. The JUnit testing framework is an ____-source tool for Java developers.

  1. Open
  2. Closed
  3. Both a and b
  4. None of the above

Answer: A) Open

Explanation:

The JUnit testing framework is an open-source tool for Java developers.

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2. Code for unit tests ensures that the ____ of a program works as it should.

  1. Logic
  2. Data
  3. Set
  4. Array

Answer: A) Logic

Explanation:

Code for unit tests ensures that the logic of a program works as it should.

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3. ____, After, and others are some of the classes and interfaces contained in the org.junit package for junit testing.

  1. Assert
  2. Test
  3. Before
  4. All of the above

Answer: D) All of the above

Explanation:

Assert, Test, Before, After, and others are some of the classes and interfaces contained in the org.junit package for junit testing.

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4. How many types of unit testing are there?

  1. 2
  2. 3
  3. 4
  4. 5

Answer: A) 2

Explanation:

There are 2 types of unit testing.

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5. Which of the following is/are the type(s) of unit testing?

  1. Manual
  2. Automated
  3. Both A and B
  4. None of the above

Answer: C) Both A and B

Explanation:

The following are the types of unit testing -

  1. Manual
  2. Automated

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6. ____ testing refers to the process of executing test cases manually without any support from tools.

  1. Manual
  2. Automated
  3. Both a and b
  4. None of the above

Answer: A) Manual

Explanation:

Manual testing refers to the process of executing test cases manually without any support from tools.

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7. There is a ____ with manual testing.

  1. Time Commitment
  2. Lack of reliability
  3. Both A and B
  4. None of the above

Answer: C) Both A and B

Explanation:

There is a time commitment and a lack of reliability with manual testing.

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8. ____ testing is when test cases are executed with the help of a tool.

  1. Manual
  2. Automated
  3. Both A and B
  4. None of the above

Answer: B) Automated

Explanation:

Automated testing is when test cases are executed with the help of a tool.

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9. The ____ of automated testing are greater.

  1. Speed
  2. Reliability
  3. Both A and B
  4. None of the above

Answer: C) Both A and B

Explanation:

The speed and reliability of automated testing are greater.

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10. In the ____ annotation, the method is specified as a test method.

  1. @Test
  2. @Before
  3. @Test(timeout=1000)
  4. @After

Answer: A) @Test

Explanation:

In the @Test annotation, the method is specified as a test method.

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11. When the time out exceeds 1000 milliseconds (1 second), the ____ annotation is used to indicate that the method will fail.

  1. @AfterClass
  2. @Before
  3. @Test(timeout=1000)
  4. @After

Answer: C) @Test(timeout=1000)

Explanation:

When the time-out exceeds 1000 milliseconds (1 second), the @Test(timeout=1000) annotation is used to indicate that the method will fail.

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12. Invocation of the method ____ will only happen once before all tests are run.

  1. @AfterClass
  2. @Before
  3. @BeforeClass
  4. @After

Answer: C) @BeforeClass

Explanation:

Invocation of the method @BeforeClass will only happen once, before all tests are run.

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13. ____ annotation indicates that the method must be called before every test.

  1. @AfterClass
  2. @Before
  3. @BeforeClass
  4. @Test(timeout=1000)

Answer: B) @Before

Explanation:

@Before annotation indicates that the method must be called before every test.

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14. Program logic can be asserted using the ____ class.

  1. Org
  2. Org.junit
  3. org.junit.Assert
  4. None

Answer: C) org.junit.Assert

Explanation:

Program logic can be asserted using the org.junit.Assert class.

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15. A primitive or object can be checked to be equal by calling ____.

  1. void assertEquals(boolean expected,boolean actual)
  2. void assertTrue(boolean condition)
  3. void assertFalse(boolean condition)
  4. void assertNull(Object obj)

Answer: A) void assertEquals(boolean expected,boolean actual)

Explanation:

A primitive object can be checked to be equal by calling void assertEquals(boolean expected, boolean actual).

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16. Invocation of a method after all tests have been completed is specified by the ____ annotation.

  1. @AfterClass
  2. @After
  3. @BeforeClass
  4. @Test(timeout=1000)

Answer: A) @AfterClass

Explanation:

Invocation of a method after all tests have been completed is specified by the @AfterClass annotation

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17. Which of the following checks if the condition is TRUE?

  1. void assertEquals(boolean expected,boolean actual)
  2. void assertTrue(boolean condition)
  3. void assertFalse(boolean condition)
  4. void assertNull(Object obj)

Answer: B) void assertTrue(boolean condition)

Explanation:

void assertTrue(boolean condition) checks if the condition is TRUE.

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18. Which of the following checks if the condition is FALSE?

  1. void assertNotNull(Object obj)
  2. void assertTrue(boolean condition)
  3. void assertFalse(boolean condition)
  4. void assertNull(Object obj)

Answer: C) void assertFalse(boolean condition)

Explanation:

void assertFalse(boolean condition) checks if the condition is FALSE.

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19. Which of the following checks if the object is NULL?

  1. void assertNotNull(Object obj)
  2. void assertNull(Object obj)
  3. void assertNullNot(Object obj)
  4. void assertNullValue(Object obj)

Answer: B) void assertNull(Object obj)

Explanation:

void assertNull(Object obj) checks if the object is NULL.

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20. Which of the following checks if the object is NOT NULL?

  1. void assertNotNull(Object obj)
  2. void assertNull(Object obj)
  3. void assertNullNot(Object obj)
  4. void assertNullValue(Object obj)

Answer: A) void assertNotNull(Object obj)

Explanation:

void assertNotNull(Object obj) checks if the object is NOT NULL.

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