From 8a7dfa0972c83fd811a4296e7373574bea4a28d0 Mon Sep 17 00:00:00 2001 From: Nguyễn Gia Phong Date: Sun, 19 Jul 2020 20:34:40 +0700 Subject: [usth/ICT2.7] Remove Udacity transcribes --- ...9 - White Box Testing Example - lang_en_vs4.srt | 143 --------------------- 1 file changed, 143 deletions(-) delete mode 100644 usth/ICT2.7/P4L1 General Concepts Subtitles/19 - White Box Testing Example - lang_en_vs4.srt (limited to 'usth/ICT2.7/P4L1 General Concepts Subtitles/19 - White Box Testing Example - lang_en_vs4.srt') diff --git a/usth/ICT2.7/P4L1 General Concepts Subtitles/19 - White Box Testing Example - lang_en_vs4.srt b/usth/ICT2.7/P4L1 General Concepts Subtitles/19 - White Box Testing Example - lang_en_vs4.srt deleted file mode 100644 index 896f9b1..0000000 --- a/usth/ICT2.7/P4L1 General Concepts Subtitles/19 - White Box Testing Example - lang_en_vs4.srt +++ /dev/null @@ -1,143 +0,0 @@ -1 -00:00:00,080 --> 00:00:03,086 -In this case we focus on white box testing. So consider now this - -2 -00:00:03,086 --> 00:00:06,556 -other function, called fun. And let's assume that we want to test this function - -3 -00:00:06,556 --> 00:00:09,777 -without having a specification. So without knowing exactly what it needs to do. - -4 -00:00:09,777 --> 00:00:12,996 -But just by looking at the code. So we will try to do the - -5 -00:00:12,996 --> 00:00:16,030 -problem in this case is to try to just execute all the statements. - -6 -00:00:16,030 --> 00:00:18,995 -In the function. And notice I will talk extensively of what does it - -7 -00:00:18,995 --> 00:00:22,560 -means to do white box testing later on in the next, two classes. - -8 -00:00:22,560 --> 00:00:25,560 -So if that's our goal, if our goal is to cover all the statements, - -9 -00:00:25,560 --> 00:00:27,670 -any input will really do. So any test case - -10 -00:00:27,670 --> 00:00:30,250 -will excecute all statements in the code. And we'll a - -11 -00:00:30,250 --> 00:00:33,801 -complete, you know, white-box testing coverage for the program. - -12 -00:00:33,801 --> 00:00:35,865 -Imagine that I now give you a specification for this - -13 -00:00:35,865 --> 00:00:39,071 -function. And what the specification says is that this - -14 -00:00:39,071 --> 00:00:43,232 -function inputs an integer parameter, param, and returns half of - -15 -00:00:43,232 --> 00:00:45,860 -its value, if param is even, and its value - -16 -00:00:45,860 --> 00:00:50,740 -unchanged otherwise. That means if param is odd. So looking - -17 -00:00:50,740 --> 00:00:54,320 -at this specification, we can clearly see that the function fun - -18 -00:00:54,320 --> 00:00:57,740 -works correctly only for even integers, and it doesn't work for - -19 -00:00:57,740 --> 00:01:00,570 -odd integers. Because it computes. Half of the value of the - -20 -00:01:00,570 --> 00:01:04,410 -parameter and returns it every time, no matter what param is. So - -21 -00:01:04,410 --> 00:01:07,320 -this is a case in which white box testing could easily - -22 -00:01:07,320 --> 00:01:10,620 -miss the problem, because as we said any input will exercise - -23 -00:01:10,620 --> 00:01:12,900 -the code. It's just by chance that we could reveal one - -24 -00:01:12,900 --> 00:01:15,750 -that revealed the problem in the code. Conversely if we were to - -25 -00:01:15,750 --> 00:01:19,520 -work, in a black box manner. Typically looking at the specification, we - -26 -00:01:19,520 --> 00:01:22,390 -will select at least one odd, and one even input number to - -27 -00:01:22,390 --> 00:01:25,010 -exercise all of the specified behavior. And we will find the problem - -28 -00:01:25,010 --> 00:01:28,110 -right away. So these two examples are just very small examples, and - -29 -00:01:28,110 --> 00:01:30,910 -they're kind of, you know, stretched. But these kind of issues occur - -30 -00:01:30,910 --> 00:01:33,680 -on a much bigger scale and in much more subtle ways in - -31 -00:01:33,680 --> 00:01:36,970 -real world software. And so what this examples do is to show - -32 -00:01:36,970 --> 00:01:41,270 -you, how black box and white box tests are really complimentary techniques. - -33 -00:01:41,270 --> 00:01:43,130 -So in the next two lessions we will explore - -34 -00:01:43,130 --> 00:01:45,130 -these two types of techniques in detail. We will - -35 -00:01:45,130 --> 00:01:48,020 -see different kinds of white box and black box - -36 -00:01:48,020 --> 00:01:50,670 -testing. And we'll talk about their strengths and the mutations -- cgit 1.4.1