Softwaretesting 11 eng

ソフトウェアテスト
　　 [11] テスト駆動開発演習
Software Testing
[11] Test-driven development Exercise
あまん ひろひさ ひろひさ

阿萬 裕久 裕久（ AMAN

Hirohisa ）

(C) 2007-2022 Hirohisa AMAN

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Exercise purpose
 Experience and learn test-driven develo
pment based on test first
 Main contents
 Practice test-driven development with a sim
ple example
 Test driven development of a f unction that m
eet the specifications
(C) 2007-2022 Hirohisa AMAN

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Exercise content
 Exercise 1

Experience test-driven development with a sim
ple example

 Exercise 2

Complete f unctions that satisf y a given specific a given specific
ation though test driven development

(C) 2007-2022 Hirohisa AMAN

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Exercise 1
[Target program] sample1101.c
[Support program] run_test.h
 run_test.h provides functions to support
test-driven development exercises
 Complete the program by a given specific editing sample
1101.c as explained below

(C) 2007-2022 Hirohisa AMAN

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What is test-driven developmen
t?
Iterative technique to make “test case fir
st” Next, write a program that passes it write a program that passes it

The new test should fail the
first time (because it is not
implemented yet).

① Test case
creation

Review

Success

②Testin
g

Failure

Refactoring
(as needed)

Success
(C) 2007-2022 Hirohisa AMAN

③ Programming

④ Testing
5

Failure

Development goals f or Exercise
1
 Make the function get_digit_number
 This function return the number of digits f
or an integer x given as an argument
 Where, 0< x <1000000 (=106) and
 When given an integer outside the above
range, return -1 as an error
(Ex1) get_digit_number(256) …This value is 3
(Ex2) get_digit_number(0)
…This value is -1 (error)

(C) 2007-2022 Hirohisa AMAN

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How to test in Exercise 1
 Use the function run_test prepared here
 Defined in the distributed run_test.h
 Usage is as follows:

run_test(1,get_digit_number(5),1);
Test No.
(Use to display
results)

Calling
(executing)
the function

under test
(C) 2007-2022 Hirohisa AMAN

Expected results in
the test (Correct
return value)
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Exercise 1
How to proceed (1/7)
 First, prepare the first test case in the
main function (step ① )
At this point,
Function
get_digit_number()
does not exist

(C) 2007-2022 Hirohisa AMAN

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Exercise 1
How to proceed (2/7)
 Compile once and check that it will be
an error (Step ②)

In this case, the function get_digit_number doesn't exist
The correct answer is to get an error

((If there is no error here, write a program that passes it a f unction with that name is already a given specific.
This will confuse the subsequent tests.)
(C) 2007-2022 Hirohisa AMAN

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Exercise 1
How to proceed (3/7)
 Then prepare the function get_digit_n
umber: For now, write a program that passes it the test should pass i
f the return value is 1 set(Step ③ )
Currently, let's try to
make it work,
although it is "ad hoc"

(C) 2007-2022 Hirohisa AMAN

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Exercise 1
How to proceed (4/7)
 This time there is no compilation error,
and when we run it, it is displayed that
No.1 test passed (step ④ )

No. 1: The PASS indication is
provided by function run_test

(C) 2007-2022 Hirohisa AMAN

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Exercise 1
How to proceed (5/7)
 Add the f ollowing test cases (Step ① )
 Give a two-digit integer (10) as an argume
nt as number 2, and make it a test case th
at expects the answer to be 2.

Add No.2
test case

(C) 2007-2022 Hirohisa AMAN

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Exercise 1
How to proceed (6/7)
 Compile and run again, this time, confir
m that the No.2 test f ails (Step ②)

No.1 remain PASS
No.2 is FAIL
The result (return value) of the function is 1 (result = 1)
Indication that the expected result is 2 (expected result = 2)
(C) 2007-2022 Hirohisa AMAN

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Exercise 1
How to proceed (7/7)
 Next, modify the program to pass both N
o.1 and No.2 tests (step ③ )
 Test-driven development gradually impr
oves the degree of perfection of the pro
gram by repeating this process.
 You can ref actor along the way a given specific
 The point of this method is that the number
of test cases gradually a given specific increases, write a program that passes it but every a given specifict
hing is re-executed each time
(C) 2007-2022 Hirohisa AMAN

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Repeat above steps
 Repeat “Add test case & modify progra modif y a given specific progra
m” until y a given specificou can confirm that the f unct
ion works as specified.
 Don't f orget error handling!

In the case of an error, -1 is the return value, b
ut it is not good to write -1 directly (it will be h
ard-coded), so it is better to define it as a macr
o called ERROR

(C) 2007-2022 Hirohisa AMAN

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Submission of Exercise 1
 Submit to Teams
sample1101.c

If you do pair programming
with two people, both of you
should submit the same thing.

[11] Exercise-2
 Submission deadline: May 23,
　　　　　　 13:00 (Vietnam time)
　　　　　　　　　　
(C) 2007-2022 Hirohisa AMAN

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Exercise 2
 In the same way as Exercise 1
Complete the program sample1102.c
by the method
 The specifications of this program are
spec1102.pdf

(C) 2007-2022 Hirohisa AMAN

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Submission of Exercise 2
 Submit to Teams
sample1102.c

If you do pair programming
with two people, both of you
should submit the same thing.

[11] Exercise-2
 Submission deadline: May 29,
　　　　　　 13:00 (Vietnam time)
　　　　　　　　　　
(C) 2007-2022 Hirohisa AMAN

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Things to note in Exercises 1 an
d2
 Calling the test functions for each task
run_test(1,get_digit_number(5), 1);
run_test(2,get_digit_number(10), 2);
……………………

thinking about various thing and keep a
dding

 One run_test becomes one test case, so
make as many a given specific as possible
(C) 2007-2022 Hirohisa AMAN

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Survey a given specific
 In this exercise, you can do it alone,
or you can do pair programming with
2 people.
 I want to know which one you chose,
so please answer the survey first

[11] Survey (you must answer first)
(C) 2007-2022 Hirohisa AMAN

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