ソフトウェアテスト 　　 [4] ブラックボックステス ト Software Testing [4] Black Box Testing Techniques あまん ひろひさ ひろひさ 阿萬 裕久 裕久（ AMAN Hirohisa ） aman@ehime-u.ac.jp (C) 2007-2022 Hirohisa AMAN Test purpose and content  Purpose Find errors, bugs that may exist in the soft ware  Content Run the software and make sure it works co rrectly as specified Make sure the failures not occur even for situations that not in specifications (C) 2007-2022 Hirohisa AMAN Difficulty of the test  Originally, designers and developers t ried to make something according to specifications  If it is outside the specifications  diffic ult to check it’s unexpected or unnotic ed in the first place (C) 2007-2022 Hirohisa AMAN Terms: Test case, Test suite, Test domain  Test case case Specific input data conditions & expected o utput  Test case suit casee A set of test cases that runs a set of tests  Test caseing Domain Domain Ensuring that the program is no error Complete collection of test cases (C) 2007-2022 Hirohisa AMAN Test example (1): Length conversion *1 kilomet caseer = 0.621371 miles Kilometers  Miles Converter 【 Input 】 A real number from to 10000 Up to two decimal places are allowed 【 Output 】 Value converted to miles, round ed down to three decimal places input expected output input expected output 0.000 9.99 6.207 9999.99 6213.703 10 6.213 0.621 -1 error 1.001 0.621 10000 error (C) 2007-2022 Hirohisa AMAN Other exceptions Test example (2): Triangle prob lem Consider a triangle with three integers a s input, each of which is the length of a side  Isosceles triangle  Equilateral triangle  Scalene triangle Consider a test case for a program that determines which of (C) 2007-2022 Hirohisa AMAN Example test case for triangle p roblem input expected output (2, 5, 5) isosceles triangle (5, 5, 5) equilateral triangle (3, 4, 5) scalene triangle (0, 0, 0) error *become a point (3, 4, 7) error *become a line segment (2, 5, 8) error sides *longest side length > sum of the lengths of other (1.3, 4, 5) error *there are real numbers (-2, 4, 5) error *have a negative number *Triangle Inequality: Length of longest side < sum of the lengths of other sides (C) 2007-2022 Hirohisa AMAN [Exercise 1] Test case an int caseeg Domainer sort caseing Domain prog Domainram  Now, We are given a program to sort s N integers  ≤ N ≤ 10000 N ≤ N ≤ 10000 10000  The input case is from a file  Consider a test case for this program (C) 2007-2022 Hirohisa AMAN Important in testing  Record the result  What case kind of problem of problem was found of problem in which t caseest case ca se, who found of problem it case and of problem when  Import caseant case informat caseion aft caseer mod of problemificat case Just reporting ion  Communicat casee properly  Ambig Domainuous informat caseion is useless that it doesn‘t work is Meaning Domainless  How you communicat casee is import caseant case t casehan report case bug Domains Should of problemn't case be proud of problemly show d of problemevelopers t casehat case you’ve found of problem a bu g Domain There are d of problemifficult caseies t casehat case only t casehe person who mad of probleme it case can un d of problemerst caseand of problem, so human relat caseionships are also import case ant case (C) 2007-2022 Hirohisa AMAN Testability  Ease of testing  Reduction in costs (man-hours) spent on te sting  Shorter period of testing  Leads to improved quality (C) 2007-2022 Hirohisa AMAN 10