All language subtitles for 022 Shopping Cart – Part 5_en

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,360 --> 00:00:04,260 Now we're going to take care of the exceptions we need to write a unit test and expect to remove to 2 00:00:04,260 --> 00:00:06,120 throw an exception if there's nothing in there. 3 00:00:06,630 --> 00:00:12,090 So here I can write a unit test that expect an illegal state exception, test expected. 4 00:00:14,560 --> 00:00:16,840 Is equal to a legal state exception, not class. 5 00:00:20,570 --> 00:00:23,300 The unit test is called Invalid Remove State. 6 00:00:29,110 --> 00:00:31,660 And first, I'm going to remove both items from the array list. 7 00:00:55,420 --> 00:00:57,430 And I'm going to try to call a remove a third time. 8 00:01:04,650 --> 00:01:09,810 If I run the test now, it fails, it's expecting the test to throw in a legal state exception, but 9 00:01:09,810 --> 00:01:10,440 it isn't. 10 00:01:17,960 --> 00:01:23,300 So now we're going to make the test pass by throwing an illegal STD exception from remove, if the card 11 00:01:23,300 --> 00:01:25,520 is empty, then throw an illegal state exception. 12 00:01:33,870 --> 00:01:35,250 And pass on a message. 13 00:01:39,990 --> 00:01:40,860 We were on the test. 14 00:01:46,210 --> 00:01:47,350 And perfect. 15 00:01:51,140 --> 00:01:55,670 Can this could be made simpler, not the code, but we can make the unit test more concise. 16 00:01:58,010 --> 00:02:03,500 I don't like how the cart class doesn't have a method we can just use to clear the shopping cart calling 17 00:02:03,500 --> 00:02:05,570 remove so many times is kind of awkward. 18 00:02:07,870 --> 00:02:11,200 Someone should avoid method name to clear that clears the area list. 19 00:02:18,470 --> 00:02:21,170 This item is the clear, and that is all. 20 00:02:24,120 --> 00:02:26,880 Now, back in the unit test, we can just clear the shopping cart. 21 00:02:33,210 --> 00:02:34,880 And everything still works as it should. 22 00:02:40,360 --> 00:02:45,400 All right, the final test we got to write is one that expects Check-Out to throw an exception if there's 23 00:02:45,400 --> 00:02:46,090 nothing in there. 24 00:02:46,720 --> 00:02:50,020 So here I can read another unit test that expects an illegal STD exception. 25 00:02:56,240 --> 00:02:59,240 The unit test is called invalid check out state. 26 00:03:10,200 --> 00:03:12,200 First, I'll clear the shopping cart. 27 00:03:14,590 --> 00:03:16,000 Then I'll try to call check out. 28 00:03:27,610 --> 00:03:33,010 If I run the test now, it fails, it's expecting the test to throw an legal state exception, but it 29 00:03:33,010 --> 00:03:33,460 isn't. 30 00:03:38,160 --> 00:03:44,460 So we got to make the test pass by throwing an illegal fit exception from check out if the card is empty. 31 00:03:48,330 --> 00:03:50,400 Then throw in a legal state exception. 32 00:03:52,220 --> 00:03:53,450 Pass a message. 33 00:04:03,120 --> 00:04:04,980 Run the test and perfect. 34 00:04:10,370 --> 00:04:12,320 Now, what I'm going to do is run every single test. 35 00:04:18,019 --> 00:04:21,950 They all passed, which means the code in Kadirgamar doesn't have any books. 36 00:04:24,600 --> 00:04:30,330 And just have a look at how clean and elegant the code is, when you write tests, before you write 37 00:04:30,330 --> 00:04:33,690 code, you're being forced to write code that is easy to test. 38 00:04:33,810 --> 00:04:36,450 And such code tends to be more polished. 39 00:04:36,720 --> 00:04:38,580 Each method performs one task. 40 00:04:38,580 --> 00:04:42,660 Each method is modular, is immune to bugs and easy to understand. 41 00:04:42,870 --> 00:04:48,270 This is why I love test driven development writing tests before writing code. 3877

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