I don't understand ReturnThruPtr mock function

[מקסים סקופין‎]

Hello, Mark, and anybody may to help me !

In this time I learn Iteration 3 and should make Homework 1. But I don't understand ExpectAnyArgAndReturn and ReturnThruPtr CMock functions.

It's right, that ExpectAnyArgAndReturn return STATUS_OK or other value from function into source code without "sending" arguments to ?

And it's right, that ReturnThruPtr "send" pointer from test to source code ?

There CMock functions are works "into pair" ? I can't to use ReturnThruPtr without ExpectAnyArg function ?

With my respect,

Maxim

[Mark Vander Voord]

Hi Maxim:

Your statements are all correct.

Remember that when using a mock, instead of the real version of the function being called, we call our fake version. The fake version can keep track of a number of things. It can track how many times the function is called and what arguments it was called with (_Expect). It can queue up return values for each time the function gets called, so that we can control what is returned from it (_ExpectAndReturn). If instead, we only care that the function was called but don't want to verify the individual arguments, we can use _ExpectAnyArgs and _ExpectAnyArgsAndReturn respectively.

Similar to the return values, we can queue argument values that we want to be filled in when there are pointer arguments (_ReturnThruPtr). Each time we call this function, it defines the value to be returned on the queue. Here's the important part though: To do that, it needs to know you expected a call to happen first... Therefore before each _ReturnThruPtr, you need one of these: _Expect, _ExpectAndReturn, _ExpectAnyArgs, or _ExpectAnyArgsAndReturn.

The _ExpectAnyArgs* options are frequently used with _ReturnThruPtr because when we want to return a value, we often do not care what the value was beforehand. It's often an empty buffer or whatnot.

Does that make sense?

Mark

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[Maxim Skopin]

Thank you, Mark, for your explanation.

Maxim

ב-יום חמישי, 31 במרץ 2022 בשעה 14:51:31 UTC+3, mvandervoord כתב/ה:

[Maxim Skopin]

But one moment for better understanding. 

 ?By ReturnThruPtr- function we inserting our pointer INTO the SOURCE CODE STRING we made ExpectAnyArgAndReturn-function for this? Or for NEXT CODE STRING

For example. We have into source code string

if(CommandHardware_CheckForMsg(&Msg)== STATUS_OK ){

For this code string we make in our test next fake :

CommandHardware_CheckForMsg_ExpectAnyArgsAndReturn( STATUS_OK ),

 Its OK, we want to return STATUS_OK. After this we make 

CommandHardware_CheckForMsg_ReturnThruPtr_msg( &msg ).

? The pointer msg is going to CommandHardware_CheckForMsg(&Msg) Msg- argument ? Or, for NEXT using of Msg into our source code 

Thank you for your answer and with my respect,

Maxim

ב-יום חמישי, 31 במרץ 2022 בשעה 20:08:11 UTC+3, Maxim Skopin כתב/ה:

[Mark Vander Voord]

Maxim:

The first time CommandHardware_CheckForMsg is called AFTER the Expect and ReturnThruPtr, then msg will be assigned to the return value.

For example, let's say the function I want to test looks like this:

int TimesTen()

{

    int number = 0;

    if (GetNumber(&number) == 0)

        return 10 * number;

    else

        return 0;

}

I am going to create a mock of this function to use it:

int GetNumber(int* number);

One of the tests for TimesTen might look like this:

void test_TimesTen_SHOULD_ReadAValueAndMultiplyItByTen(void)

{

    // I don't care what the starting number is, I just want it to return a status of 0 and a number of 45 for this test

    GetNumber_ExpectAndArgsAndReturn(0);

    GetNumber_ReturnThruPtr_number(45);

    TEST_ASSERT_EQUAL_INT(450, TimesTen() );

}

[Maxim Skopin]

: Thank you, Mark, for your explanation. It's, probably, depends from style of programming. I would do it other 

}int GetNumber(void)

;return number

{

and

(()if(!(number=GetNumber

;return 10*number

else

;return 0

ב-יום שישי, 1 באפריל 2022 בשעה 06:06:12 UTC+3, mvandervoord כתב/ה:

[Mark Vander Voord]

Maxim:

I 100% agree that your solution is a better solution for the code. I was only creating an example so you could see how ExpectAnyArgs and ReturnThruPtr are used.

Mark

[מקסים סקופין‎]

Thank you, Mark. At now I understand better. 

With my respect,

Maxim

сб, 2 апр. 2022 г., 04:51 Mark Vander Voord <mvande...@gmail.com>:

Maxim:

I 100% agree that your solution is a better solution for the code. I was only creating an example so you could see how ExpectAnyArgs and ReturnThruPtr are used.

Mark

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