Chapter 9

Question 1

logic error

Answer 1

a problem where the program compiles & executes without an obvious error but delivers wrong result

Question 2

testing

Answer 2

an activity concerned with finding out whether a segment of code contains any errors

Question 3

debugging

Answer 3

• comes after testing
• the attempt to pinpoint& fix the source of an error

Question 4

unit testing

Answer 4

tests of the individual parts of an application, such as methods and classes

Question 5

positive testing

Answer 5

the testing of cases that are expected to succeed

Question 6

negative testing

Answer 6

testing of cases that we expect to fail

Question 7

test automation

Answer 7

simplifies the process of regression testing

Question 8

regression tests

Answer 8

• desirable to run whenever a change is made to software because further errors can be introduced when modifying software
• involves rerunning tests that have previously passed, to ensure the new version still passes them
• one of the easiest ways to automate regression tests is to write a program that acts as a test rig or test harness

Question 9

JUnit

Answer 9

a popular testing framework to support organized unit testing and regression testing in Java

Question 10

test class

Answer 10

• color is different from the ordinary classes in the diagram
• annotated as «unit test»
• attached to ordinary class (reference class) of the same name
• additional controls in the main window, below compile button
• right click menu has 3 new sections instead of list of constructors

Question 11

assertion

Answer 11

an expression that states a condition that we expect to be true.
If the condition is false, we say that the assertion fails. this indicates an error in our program

Question 12

fixture

Answer 12

a set of objects in a defined state that serves as a basis for unit tests

Question 13

walkthrough

Answer 13

• an activity of working through a segment of code line by line while observing changes of state and other behavior of the application

Question 14

disadvantages of print statements

Answer 14

• not practical to add print statements to every method in a class- only effective if the right methods have been annotated
• adding too many can lead to info overload. Print statements inside loops are particular source of this problem
• can be tedious to remove once their purpose is served
• they may be needed again after removing so frustrating to put back in