mull | Practical mutation testing and fault injection for C and C++ | Testing library
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kandi X-RAY | mull Summary
Mull is a practical mutation testing tool for C and C++. For installation and usage please refer to the latest documentation:
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QUESTION
I have a TypeScript project that runs a backend RESTful API using Express. It is very object-heavy by design, so that lots of classes can be instantiated and injected into each other both at run time and when services classes are tested.
We have a good suite of tests across all service classes. However, we have an index.ts
that brings this all together, and this presently escapes test automation. I am mulling a variety of approaches to testing this, so that endpoints and lightweight controllers are insulated against regressions. (Rather than list all my ideas that might result in an overly broad question, I shall focus on one specific idea for now).
Let me show an example of my front controller (src/index.ts
):
ANSWER
Answered 2021-May-28 at 18:57If you'd like to keep the test suite completely separate and only test the HTTP endpoints using fetch
, as a user would, you can use concurrently to achieve this.
QUESTION
This question though having three answers raised me doubts as I am mulling my head over the problem. Though I am aware that problem can be solved by other methods (and using purrr or apply group of functions especially), Yet I am not sure that can It be actually done through mutate(across(...
? I am reproducing the problem for sake of clarity here. Note: I am not looking for its answer but only an answer to my doubt whether two sets of variables can actually be passed through mutate/across
There are two sets of variables (one without suffix and one set with suffix avail).
...ANSWER
Answered 2021-Apr-09 at 05:41You can do this with get
with cur_column()
.
QUESTION
I need to make the arrow of the right side colorful #2b6a83
...ANSWER
Answered 2021-Apr-06 at 20:40You where almost there ;) Just add the background-color: #2b6a83
to your :before
and :after
elements. Be aware that an :after
element with a position absolute will be rendered in front of the parent element. You can fix that by using a simple negative z-index
like z-index: -1
:
QUESTION
I have a function to print elements of a doubly linked list. I pass the head of the list to the function and use another variable inside the function. Without assigning the inside variable to the passed variable, I am able to access the list elements. [Note - AddtoHead function is not shown], Now added for clarity
...ANSWER
Answered 2021-Jan-08 at 19:40Segmentation faults are caused when your program attempts to access memory that is not mapped in your virtual address space or that is mapped but not with permission for the type of access you attempted.
When an object is not initialized, the compiler is permitted to use any value for it. Your program might take a value from some processor register (such a register that the processor would have used for last
if you had initialized it). That register might have the address of someplace in virtual memory where your program does have data, so it is mapped in your virtual address space and you can access it. This is not unlikely because your program has been using processor registers for various things, such as calculations or accessing memory, so sometimes they have valid memory addresses in them.
When this happens, your program accesses the memory and no segmentation fault occurs.
It is also not unlikely that the register would have had something other than a valid address in it, such as the result of calculating some expression or some values from intermediate parts of expressions.
QUESTION
I've mulled over this for so long it's frying my brain. It's possibly I don't fully understand recursion yet.
I don't understand why the value of k, after it equals reaches 0, does not go into the negatives. Instead it remains 0 until the helper function exists. I tried passing in an integer with an initial value of zero and adding until its value equaled k. However, this resulted in the same problem where once it equaled k, it remained that way.
Can someone please explain why the value stays the same?
...ANSWER
Answered 2020-Sep-20 at 04:45I think the problem is because you are passing k
across each recursive call. You shouldn't do that because that causes each recursive call to get their own copy of k
. This means that when you modify k
:
QUESTION
I'm a beginner in assembly language. I try to multiply two numbers.
...ANSWER
Answered 2020-Sep-22 at 07:46In comments, Michael answered on my question, changing dw to dd solved the problem.
QUESTION
I ran
...ANSWER
Answered 2020-Aug-26 at 13:42I am creating an answer based on the comment from @LaurenzAlbe. The loadable_libraries.txt
was not placed in the current directory from which the command
was run . Instead let's go find where it went:
QUESTION
This question will be an interesting one. I was trying to replicate the results of a paper which concerned disease transmission in a system of freely moving agents (sounds like the perfect job for NetLogo). I coded up a simple SIR model in NetLogo pretty easily according to the details given in the paper, made sure my model parameters matched those listed, and let the simulation run. Everything ran perfectly until I checked how the experimental results matched with the predicted values (according to the results of the paper). They were off, and by a pretty sizeable margin. Thinking there was an error somewhere in the code, I triple checked everything, only to find nothing. I then made sure the ordering of events was correct (as the order of movement, infection, and recovery matters), and these also matched the paper. I mulled over the problem for quite some time until finally I opened R, coded up the exact same program in RStudio, and let it run, only to find that the results matched the prediction perfectly! The R code does the same thing I expect the NetLogo code to be doing, so I think that something is going on behind the scenes in NetLogo or I've a misunderstanding somewhere that is the source of the deviation... Note that since the result in the paper is a mean-field approximation, you would have to run the program a few times in order for it to approach the theoretical result.
I'm not sure where I'm going wrong, as my R code confirms the predicted values are correct, so I conclude that something somewhere in my NetLogo code is incorrect. I'm not too familiar with NetLogo, and I would really appreciate it if someone could help me find where in the following code the deviation may be occurring. The experimental average tends to be lower than the predicted one, suggesting that infection occurs faster than it should, but of all the changes I looked at, none of them solved this problem (e.g. infections do not occur one at a time per infectious turtle). Any suggestions/help would be very much appreciated.
A slimmed-down version of my code is presented below. This should run in a regular interface with the standard setup/go buttons. Results are stored in lists that can be plotted, and anyone curious can see the deviation as the simulation progresses via the Plot object. Thank you in advance.
...ANSWER
Answered 2020-Aug-25 at 13:37One problem I can see is that you have: setxy random-pxcor random-pycor
but you want: setxy random-xcor random-ycor
Basically you are putting all your turtles at the centre of the patch, so they are on top of each other, instead of distributing them randomly across the space. That positioning changes the distribution of possible distances between turtles.
I also changed the number of turtles to 1024 1089 and the size to sqrt 1024 (instead of 1000) to make the density match properly.
Both of those reduced the mismatch but it's unclear whether they fix the problem since I didn't do large numbers of runs.
UPDATE
Even more dimension matching is required. Changing the code so there are 1089 agents, setting length to 33 for the pred calculations, and resizing world with max of 32 appears to move the curves closer. This recognises that patch coordinates 0 to 32 actually describe a size with length 33 because NetLogo coordinates would start at -0.5 and run to 32.5 as mentioned by @Jasper
QUESTION
I've been mulling this over for some time now and I just can't get it to work.
So in brief, I have a Splash Activity from where I call another activity that contains my ViewModel. The ViewModel in simple terms just needs to sequentially run function A(which is getfbdata below; it is a network call.). And only after this function completes, it should run function B (which is dosavefbdata below; save info to DB.). Again, it should wait for function B to complete before running the main thread function, function C(which is confirm first below; it checks whether function B has completed by getting the result from function B (dosavefbdata below). If function C is positive, it closes the Splash activity.
Suffice to say, none of the above works. Println results show all functions were run sequentially without waiting for each to complete. Lastly, SplashActivity().killActivity() call on function C did not work.
Note: withContext does not require to await() on the suspended functions right? I also tried using viewModelScope.async instead of viewModelScope.launch.
I would really appreciate your help here. Thanks in advance.
*Under SplashActivity:
...ANSWER
Answered 2020-Jun-18 at 15:24Use
AndroidViewModel
if you want to haveContext
in it:
QUESTION
I am trying to develop a number grading system for a course using Angular 8. The real scenario is quite complex, so I separated the part and created a new project to explain where I have the problem. If you look at the image you will get an idea, what I am trying to accomplish. Assume this is the grade form of one course. For a course, there can have different exams. Students who are enrolled in this course, they will attend those specific exams for this course and then teacher will submit the number using this form. Suppose, for the first row first column (Mid Exam), the form should not allow you to provide more than 25 marks or less than zero. If you put 20 on the Mid Exam field then Total
will show 20, GP will show 0.00, Grade will show F. Then if you put 30 on the Final exam field, Total value will be updated to 50, GP will be updated to 0.00 and will be updated to F. Again if you put 40 on the Assessment field, Total value will be updated to 90, GP will be updated to 4.00 and will be updated to A. Same thing will be happened to for all the row. If you click on the Save button, numbers will be submitted.
Now I am describing the code that I tried and my problem, here studentList
, examList
and gradePointList
array will populate the data for a course from backend service. I created populateSomeDemoData
method to generate this data. studentList is an array of the Student object which contains students' id and name. examList is an array of the Exam object which contains exam id, exam name and total marks of this exam. gradePointList contains the range of the number of letter grade and grade point. Suppose if the total mark is between 90 (minimumNumber) and 100 (maximumNumber) the grade point will be 4.00 and letter grade will be A. I tried to create a form gradeForm
and applied a loop on examList for per row to create input field. But for this, I couldn't able to access the specific field using form control that's why I failed to calculate total marks and grade point for a row. Also for the same reason, I failed to create the list of Grade object which will be sent to the backend. Grade
is the object of every field which will contain student, exam and number. If a field is updated, this grade object will also be updated. If Save button triggers, this number list will be passed to the backend.
HTML part is:
...ANSWER
Answered 2020-May-29 at 17:01Ok I can see that to meet your requirements you have to use nested arrays, you need to follow this structure, or at least a 2 d array, grades[][]: grades[studentId][examId], you will understand more when you read the code, there is a lot missing in your code, for example the validations for the marks and the calculation for total and GP fields, I will not bother with these parts (I added a sample for calculation and validation, but you need to modify it), but I will show you how to populate your form group properly, and how to use it, having a dynamic view. As I mention you need a 2d array, for me I went with more info, so I have an array of object, the object has 2 properties, one is student control (hold student id), and one is an array of grades for this student here is the loop I used to populate my form group
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