1 00:00:01,130 --> 00:00:08,090 So now I want to test this function that's part of my render package, render template, and the very 2 00:00:08,090 --> 00:00:12,890 first thing I notice about this is that this doesn't actually throw an error. 3 00:00:13,340 --> 00:00:14,990 And that's a bit of a problem. 4 00:00:15,110 --> 00:00:21,350 I mean, it does generate an error down here, which is, you know, when I when I say buff right to 5 00:00:21,350 --> 00:00:25,790 the at the response rate, it generates an error, but I don't return one. 6 00:00:25,820 --> 00:00:30,410 So the very first thing I'm going to do is modify this to make it easier to test. 7 00:00:30,980 --> 00:00:32,150 I'm going to have a return on error. 8 00:00:32,630 --> 00:00:34,860 And if there is no error, it will return nil. 9 00:00:35,120 --> 00:00:39,890 So down here at the very end, if everything worked, I can say return nil. 10 00:00:41,240 --> 00:00:47,260 And here, where it generates an error, I'm going to return an error in the same way. 11 00:00:47,270 --> 00:00:51,770 If this is not OK, if I can't get the template from the cache, I'll return 12 00:00:55,310 --> 00:01:01,940 errors dot new can't get template from cache. 13 00:01:03,440 --> 00:01:05,050 Is there anywhere else I'm throwing an error? 14 00:01:05,090 --> 00:01:05,510 No. 15 00:01:05,600 --> 00:01:07,320 So now this throws an error. 16 00:01:07,340 --> 00:01:08,710 Now does this break our handlers? 17 00:01:08,720 --> 00:01:14,120 Let's go to our handlers and find out when I generate a page calling render template. 18 00:01:14,120 --> 00:01:17,570 All I'm getting is a warning that there's an unhandled error and I can live with that for now. 19 00:01:17,660 --> 00:01:21,470 OK, so now I have something I can actually look for. 20 00:01:21,470 --> 00:01:23,320 I can see if there's an error or not. 21 00:01:23,810 --> 00:01:27,140 So let's go back to our render underscore test. 22 00:01:27,330 --> 00:01:32,130 Go and think about how we're going to write our test render template function. 23 00:01:33,110 --> 00:01:35,560 Well, there's one thing I know I know I need to do straight away. 24 00:01:36,140 --> 00:01:40,280 You recall a couple of lectures ago in our render package. 25 00:01:40,670 --> 00:01:44,660 We actually created this variable at the top, which was path to templates. 26 00:01:45,110 --> 00:01:49,660 And when I run my tests in the render package, this is not the correct path. 27 00:01:49,820 --> 00:01:56,060 Fortunately, since I've extracted this to a variable, a package level variable in my render test or 28 00:01:56,060 --> 00:02:03,620 my render test when I create my testing function, which will do right now func test render template, 29 00:02:04,190 --> 00:02:10,400 which is of type testing t I can set that variable path to templates is equal to and I'll make it what 30 00:02:10,400 --> 00:02:16,020 it needs to be for the purposes of this test, which is two levels up from our current directory. 31 00:02:16,040 --> 00:02:18,710 Dot, dot, dot, dot, dot. 32 00:02:18,860 --> 00:02:20,240 And then templates. 33 00:02:22,640 --> 00:02:23,000 All right. 34 00:02:23,180 --> 00:02:26,120 So now we know we have a means of getting to the templates. 35 00:02:27,080 --> 00:02:30,340 So then I need to what what's the first thing I have to do? 36 00:02:30,350 --> 00:02:35,600 Let's we need to have a template cache before we can render anything so we can just say take for template 37 00:02:35,600 --> 00:02:40,910 cache and error are assigned the value of call the create template cache. 38 00:02:41,120 --> 00:02:43,760 So now I have a template cache and potentially an error. 39 00:02:44,210 --> 00:02:48,170 If there's an error, if error is not equal to nil, I don't need to fail. 40 00:02:48,590 --> 00:02:53,180 So I can say dot error and the error is just the error that it was passed. 41 00:02:53,360 --> 00:02:54,590 So that will fail the test. 42 00:02:55,340 --> 00:03:02,030 Now that I've created the template cache, I need to put that into my variable app and that's a package 43 00:03:02,030 --> 00:03:05,290 level variable so I can just assign a template cache equals T.C.. 44 00:03:06,110 --> 00:03:06,590 All right. 45 00:03:06,590 --> 00:03:08,180 We're almost ready to call this function. 46 00:03:08,690 --> 00:03:09,950 There's one problem, though. 47 00:03:10,310 --> 00:03:12,680 We actually want to call render template. 48 00:03:12,770 --> 00:03:14,030 So let's look at that for a minute. 49 00:03:14,630 --> 00:03:17,240 Render template is right here. 50 00:03:17,270 --> 00:03:24,320 It wants a response writer, a request the string to the name of the template we want to render and 51 00:03:24,320 --> 00:03:27,080 then our template data and then it throws an error, which we just edit. 52 00:03:27,260 --> 00:03:28,130 Here's the problem. 53 00:03:28,130 --> 00:03:28,960 The response writer. 54 00:03:29,000 --> 00:03:30,640 How do I create a response writer? 55 00:03:31,130 --> 00:03:37,670 Well, if we try to actually call this right now, error equals render template. 56 00:03:38,330 --> 00:03:39,390 We need a response writer. 57 00:03:39,410 --> 00:03:45,890 So let's just call that response rate or I'm calling it two WS for a reason and our request. 58 00:03:46,190 --> 00:03:52,940 And we need to render some templates, say home page dot temple, and it needs to have some template 59 00:03:52,940 --> 00:03:58,640 that which we can just pass in is an empty variable, a pointer to model start template data. 60 00:03:59,720 --> 00:04:02,620 So that should be enough to call it. 61 00:04:02,900 --> 00:04:07,850 The problem is I don't have a response and I don't have a request. 62 00:04:07,850 --> 00:04:09,440 So where am I going to get these things? 63 00:04:09,740 --> 00:04:13,610 While the request is easy, we already have this get session function down here. 64 00:04:13,610 --> 00:04:15,440 That gives me something back. 65 00:04:15,440 --> 00:04:22,310 It gives me an HP request and an error so I can just come up here before I call, render template and 66 00:04:22,310 --> 00:04:26,810 say hour and an error are equal to get session. 67 00:04:28,670 --> 00:04:36,740 If error is not equal to nil, then fail the test error and error, so now I have my error right here. 68 00:04:36,930 --> 00:04:40,370 OK, this has to be a sign there. 69 00:04:40,730 --> 00:04:47,050 Now I have my my my other variable, so I have my request, which is a pointer to an HTP request, but 70 00:04:47,060 --> 00:04:51,590 I still don't have a response rate or I need to have a writer of some sort. 71 00:04:51,920 --> 00:04:57,050 So if we look at the render template package, it says it has to have an HTTP response, right. 72 00:04:57,200 --> 00:04:59,100 Well, is that built into the testing package? 73 00:04:59,420 --> 00:05:00,230 Can I just go? 74 00:05:00,440 --> 00:05:06,190 W-W is assigned the value of each test dot and then we had a new request. 75 00:05:06,200 --> 00:05:07,670 Is there a new response writer? 76 00:05:07,760 --> 00:05:09,030 New response? 77 00:05:09,680 --> 00:05:10,630 No, I don't see one. 78 00:05:11,140 --> 00:05:15,590 Well, there's a number of ways of doing this, but what I'm going to do is actually create an object 79 00:05:15,590 --> 00:05:22,760 using interfaces or create a type using interfaces that satisfies the requirements for a response. 80 00:05:22,760 --> 00:05:23,030 Right. 81 00:05:23,360 --> 00:05:25,400 So I'm going to go back over to setup test. 82 00:05:25,400 --> 00:05:27,440 I'll put them all in here just for the sake of doing it. 83 00:05:28,640 --> 00:05:35,720 So the first thing I want to do is create a type which I'll just call my writer and that's just going 84 00:05:35,720 --> 00:05:36,590 to be a struct. 85 00:05:36,860 --> 00:05:40,870 OK, no members, just an empty struct. 86 00:05:41,390 --> 00:05:42,350 So that's my writer. 87 00:05:42,950 --> 00:05:47,220 And then if we look at the response, let's see HTP response. 88 00:05:47,220 --> 00:05:49,330 Let me find an example where I can just point at it. 89 00:05:49,940 --> 00:05:55,270 So, for example, it should be a response rate. 90 00:05:55,310 --> 00:06:01,940 I'll just point out that when I pointed that it says the type response writer is an interface that has 91 00:06:01,940 --> 00:06:04,730 a header, a right and a right header method. 92 00:06:04,850 --> 00:06:11,720 If we can create a type that satisfies all of those requirements, we can use that in in place of an 93 00:06:12,450 --> 00:06:13,850 HTTP response rate. 94 00:06:13,970 --> 00:06:14,660 So let's go do that. 95 00:06:14,870 --> 00:06:15,710 It's really not that hurt. 96 00:06:16,400 --> 00:06:18,040 So we need to create three things. 97 00:06:18,050 --> 00:06:20,760 So the very first one we created are our type here. 98 00:06:20,870 --> 00:06:22,590 Now we need to create methods on that. 99 00:06:22,910 --> 00:06:28,790 So one was header, for example, func, and I'll call this T.W. just because I have to have a name 100 00:06:28,790 --> 00:06:29,200 for it. 101 00:06:29,600 --> 00:06:37,700 This will be a pointer to my writer and the function has to be called header and it has to return. 102 00:06:37,910 --> 00:06:44,750 And HGP dot header, which we can see if you actually go over again and point at this method, which 103 00:06:44,750 --> 00:06:50,120 is right here, this type, it says it's a header that returns a header. 104 00:06:50,120 --> 00:06:51,200 So we can do that. 105 00:06:51,260 --> 00:06:52,130 That's not hard at all. 106 00:06:53,030 --> 00:06:57,980 So all we have to do to satisfy that interface is create an empty header variable. 107 00:06:57,980 --> 00:07:06,110 VAR H HDP var H HDP dot header and return it. 108 00:07:07,280 --> 00:07:08,590 So there's one method down. 109 00:07:09,200 --> 00:07:09,900 No problem. 110 00:07:10,280 --> 00:07:15,800 Now we need the second one and the second one was a right method, right header method. 111 00:07:15,800 --> 00:07:17,180 So func. 112 00:07:18,020 --> 00:07:21,830 And again this has to have a receiver that links it with my right or type 113 00:07:24,740 --> 00:07:25,880 right header. 114 00:07:26,570 --> 00:07:27,740 And did that take parameters. 115 00:07:28,550 --> 00:07:29,530 Let's take a look at this again. 116 00:07:32,470 --> 00:07:36,640 So right heter takes a parameter of type int and doesn't return anything, well, that's easy. 117 00:07:37,450 --> 00:07:38,800 So we'll go back over here. 118 00:07:39,520 --> 00:07:44,180 So I intend it doesn't return anything and that should be sufficient for that one. 119 00:07:44,290 --> 00:07:50,530 So we have that the last method renderer is right, I believe. 120 00:07:51,580 --> 00:07:56,510 And Wright takes a slice of bytes and returns into an error. 121 00:07:56,620 --> 00:07:57,820 OK, all we can do that. 122 00:07:58,780 --> 00:08:06,550 So the last one is func T.W. Pointer to my writer and it's called Right. 123 00:08:06,790 --> 00:08:15,110 And it takes a slice of bytes, so be slice of byte and it returns an inch and an error. 124 00:08:16,000 --> 00:08:19,900 Now in this case, we actually can't just return a random event. 125 00:08:20,230 --> 00:08:22,800 And this is an area would discover the hard way. 126 00:08:23,080 --> 00:08:24,700 But I will just tell you how to do this. 127 00:08:24,700 --> 00:08:27,400 So we need to figure out the length of the slice of bytes. 128 00:08:27,820 --> 00:08:32,830 So length is assigned the value of Lyndon B.. 129 00:08:33,820 --> 00:08:39,090 And I return length and no error take no. 130 00:08:40,030 --> 00:08:41,170 And that should be sufficient. 131 00:08:41,320 --> 00:08:47,920 So now I've created all of the three methods or all of three functions that are required to satisfy 132 00:08:47,920 --> 00:08:54,420 the interface that will allow us to use our own type, my writer, instead of a response rate. 133 00:08:54,970 --> 00:08:57,460 So this W-W is the issue. 134 00:08:58,060 --> 00:09:07,600 So let's make this now what we can actually fix this we can say via WW two WS is of type my return and 135 00:09:07,600 --> 00:09:13,090 then we can just say, well, we've got there right now, we've actually created it so we can actually 136 00:09:13,090 --> 00:09:14,020 just put it right here. 137 00:09:14,230 --> 00:09:16,330 But instead of this, it needs to be a pointer. 138 00:09:17,020 --> 00:09:18,160 It does not implement. 139 00:09:18,160 --> 00:09:19,240 Some methods are missing. 140 00:09:19,240 --> 00:09:19,630 Right. 141 00:09:19,630 --> 00:09:20,770 Byte error. 142 00:09:21,270 --> 00:09:22,870 Let's go back to what do we get wrong here? 143 00:09:23,170 --> 00:09:26,890 Setup test of right there. 144 00:09:29,060 --> 00:09:29,410 All right. 145 00:09:29,650 --> 00:09:34,480 Now, we've created the necessary variable to satisfy the requirements for a response. 146 00:09:34,480 --> 00:09:34,680 Right. 147 00:09:35,890 --> 00:09:39,010 So now we can actually render our template and check for the error. 148 00:09:39,040 --> 00:09:43,470 So we've rendered this template and we've passed it the necessary information. 149 00:09:43,690 --> 00:09:45,100 There are no parentheses after this. 150 00:09:45,100 --> 00:09:46,180 I don't know where those came from. 151 00:09:47,560 --> 00:09:48,730 And we can check for our error. 152 00:09:49,840 --> 00:09:53,950 If error is not equal to nil, we can just say 153 00:09:57,610 --> 00:10:04,670 Teda error, error rating template to the browser there. 154 00:10:06,640 --> 00:10:08,830 And then again, we probably should check for something else. 155 00:10:08,830 --> 00:10:09,850 We can do it right here. 156 00:10:09,850 --> 00:10:13,300 I'm going to do this again, but this time I'm going to call it exactly the same. 157 00:10:13,300 --> 00:10:19,510 But I would call a non existent template something that I know is not in my template cache. 158 00:10:19,900 --> 00:10:24,490 And this time I want to say if the error is equal to nil, in other words, if it successfully renders 159 00:10:24,490 --> 00:10:26,860 a non-existent template, well, it ought not to be doing that. 160 00:10:27,190 --> 00:10:35,680 So I'll say got a template that did not exist or rendered template that does not exist. 161 00:10:35,830 --> 00:10:36,210 All right. 162 00:10:37,000 --> 00:10:39,850 So that should be sufficient, which is clean this up a little bit. 163 00:10:40,210 --> 00:10:42,610 What's that should be sufficient to actually try to run this test? 164 00:10:42,620 --> 00:10:43,270 So let's do that. 165 00:10:43,480 --> 00:10:43,960 Go. 166 00:10:44,140 --> 00:10:45,160 Am I in the right package? 167 00:10:46,220 --> 00:10:48,610 I'm in render go test drive. 168 00:10:48,760 --> 00:10:49,840 Let's see what we got. 169 00:10:51,180 --> 00:10:55,630 And everything passed, so it says here, can't get template from cash. 170 00:10:55,650 --> 00:10:56,550 Where did that come from? 171 00:10:56,670 --> 00:11:00,930 That comes from can't get comtemplate from cash. 172 00:11:00,930 --> 00:11:03,650 That actually comes from a vendor package, I believe, yet right here. 173 00:11:04,230 --> 00:11:05,210 So that is fine. 174 00:11:05,220 --> 00:11:06,140 I don't mind that at all. 175 00:11:06,150 --> 00:11:07,200 That air is just fine. 176 00:11:07,200 --> 00:11:10,740 I can actually get it out of here entirely if I want to and run it again. 177 00:11:12,850 --> 00:11:18,170 And everything passed the way that it should, so now we have tested rendering our template. 178 00:11:18,310 --> 00:11:20,390 There's a few other things we have to try to test as well. 179 00:11:21,400 --> 00:11:25,770 So let's go back to our render package and see what's not tested so far. 180 00:11:25,780 --> 00:11:27,820 So we haven't tested new templates. 181 00:11:27,850 --> 00:11:28,520 Can we do that? 182 00:11:28,540 --> 00:11:29,010 Sure. 183 00:11:29,020 --> 00:11:30,850 That one is absolutely trivial. 184 00:11:30,850 --> 00:11:38,440 We just go back to our render test, create a new test function, which we will call function test new 185 00:11:38,710 --> 00:11:39,370 templates. 186 00:11:40,540 --> 00:11:44,800 And all we have to do is say new templates app. 187 00:11:46,150 --> 00:11:49,630 And that should actually fire that that that function. 188 00:11:49,870 --> 00:11:50,950 And it's not doing anything. 189 00:11:50,960 --> 00:11:51,850 It doesn't return anything. 190 00:11:51,880 --> 00:11:54,880 So this should be sufficient to force it to go through the testing process. 191 00:11:55,810 --> 00:11:56,270 All right. 192 00:11:56,320 --> 00:11:57,540 So we've tested that. 193 00:11:57,550 --> 00:11:59,410 Is there anything else we have to test? 194 00:12:00,430 --> 00:12:02,050 Have we tested adding default data? 195 00:12:02,080 --> 00:12:04,740 Yes, we've tested rendering our templates. 196 00:12:04,750 --> 00:12:05,200 Yes. 197 00:12:05,500 --> 00:12:07,560 We've tested create template cache. 198 00:12:07,570 --> 00:12:09,540 No, I don't see that at all. 199 00:12:09,550 --> 00:12:10,440 So we have to do that. 200 00:12:10,720 --> 00:12:14,040 So let's go look at test template cash or create template cash. 201 00:12:15,760 --> 00:12:17,290 That is right here. 202 00:12:18,040 --> 00:12:20,310 So this takes a map of string template template. 203 00:12:20,890 --> 00:12:21,910 No, it doesn't take anything. 204 00:12:21,910 --> 00:12:23,240 It returns those two things. 205 00:12:23,260 --> 00:12:23,560 All right. 206 00:12:23,560 --> 00:12:24,640 So let's create that test. 207 00:12:24,770 --> 00:12:25,600 That's the last one. 208 00:12:25,600 --> 00:12:31,930 I think we have to do func and we will test create template cache. 209 00:12:33,040 --> 00:12:37,840 And what we have to do is, again, specify our path, the template path to templates. 210 00:12:39,010 --> 00:12:44,590 And that's going to be equal to Doug's templates. 211 00:12:44,800 --> 00:12:46,720 So now we've got the correct value set. 212 00:12:46,750 --> 00:12:51,960 So when this function is called, we will look in the correct location and then we just call it create 213 00:12:51,970 --> 00:12:52,630 template cache. 214 00:12:52,630 --> 00:12:57,430 T.S. error is equal to create template cache. 215 00:12:58,990 --> 00:13:05,500 And we say if error is not equal to nil, then Teda error error and that will fail the test. 216 00:13:05,650 --> 00:13:08,950 Let's try running that now and see if these new tests work. 217 00:13:09,100 --> 00:13:14,320 Cleared the screen run and we have t declared but not used. 218 00:13:14,560 --> 00:13:17,780 OK, so Turkey declared is not used. 219 00:13:17,800 --> 00:13:22,800 OK, well we can't do that then so we don't actually need that turkey variable. 220 00:13:22,840 --> 00:13:23,860 We just needed to run. 221 00:13:26,140 --> 00:13:26,880 Let's try that again. 222 00:13:29,140 --> 00:13:34,720 And everything past perfect, so it looks like we've covered pretty much everything we have to now, 223 00:13:34,720 --> 00:13:37,100 we're not sure yet because we haven't checked our coverage. 224 00:13:37,450 --> 00:13:41,720 We will do that in the next lecture and see if we missed anything that needs to be tested. 225 00:13:42,850 --> 00:13:43,710 That's enough for now.