Write tests and implementation for size and is empty isEmpty and sizeThese two methods must take constant time. That is, the time it takes to for either method to finishexecution should not depend on how many elements are in the deque.Write one or more tests for isEmpty and size. Run them and verify that they fail. Your test(s) shouldverify more than one interesting case, such as checking both an empty and a nonempty list, or checkinthat the size changes.For these tests, you can use the isTrue or isFalse methods on your assertThat statements.Your tests can range from very fine-grained, e.g. testIsEmptycoarse grained, e.g. [testSizeAndIsEmpty. It's up to you to explore and find what granularity you prefer.testSizeZero testSizeOne to veryTask: Write tests for tho9

Import two packages 'org.junit.Assert' and 'org.junit.jupiter.api.Test' where 'org.junit.Assert'…

Answered: deque. Write one or more tests for…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write tests and implementation for size and is empty

isEmpty and size
These two methods must take constant time. That is, the time it takes to for either method to finish
execution should not depend on how many elements are in the deque.
Write one or more tests for isEmpty and size. Run them and verify that they fail. Your test(s) should
verify more than one interesting case, such as checking both an empty and a nonempty list, or checkin
that the size changes.
For these tests, you can use the isTrue or isFalse methods on your assertThat statements.
Your tests can range from very fine-grained, e.g. testIsEmpty
coarse grained, e.g. [testSizeAndIsEmpty. It's up to you to explore and find what granularity you prefer.
testSizeZero testSizeOne to very
Task: Write tests for tho
9

Expert Solution

Step 1

Import two packages 'org.junit.Assert' and 'org.junit.jupiter.api.Test' where 'org.junit.Assert' is static.
Declare a class named 'Deque_test'
Declare five methods in the class- testIsEmpty(),testIsEmpty_One(),testIsEmpty_Three(),testSizeZero(),testSizeTwo(),testSizeMultipe()
Use @Test to annotate these methods as test methods or test cases which can be used for testing.
Method testIsEmpty() contains a declaration of empty deque data structure and method assertFalse(deque.isEmpty()) is used to check if deque.isEmpty() function to return false.
Method testIsEmpty_One() contains a declaration of empty deque data structure. An element '1' is added to the deque using the addLast() method in the deque. It also contains a method assertTrue(deque.isEmpty()) is used to check if deque.isEmpty() function to return true.
Method testIsEmpty_Three() contains a declaration of empty deque data structure named 'deque' of integer type. Three elements 1,2,13 are added to the deque using the addLast() method in the deque. It also contains a method assertTrue(deque.isEmpty()) is used to check if deque.isEmpty() function to return true.
Method testSizeZero() contains a declaration of empty deque data structure named 'deque' of integer type. And a method assertFalse(deque.size() == 0) which is used to check if deque.size() == 0 value returns false.
Method testSizeTwo() contains a declaration of empty deque data structure named 'deque' of integer type. Two elements 1,2 are added to the deque using the addLast() method in the deque. And a method assertFalse(deque.size() == 2) which is used to check if deque.size() == 2 value returns false.
Method testSizeMultiple() contains a declaration of empty deque data structure named 'deque' of integer type. Three elements 1,2,3 are added to the deque using the addLast() method in the deque. And a method assertFalse(deque.size() == 3) which is used to check if deque.size() == 3 value returns false.

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