是否可以使用python模拟C函数？

我想知道是否可以使用Python库模拟C函数，以及如何模拟

为了在Python中对C函数进行单元测试，我使用了共享库，但是我不能模拟一个函数来通过测试。当不需要使用mock时，测试工作正常

所以我的问题是：是否可以使用PythonMock模拟C函数，以及如何模拟

下面是一个源代码示例

//read_sensor.c
   #include <stdint.h>
   #include "read_sensor.h"        
   uint8_t read_sensor (void)
   {
       return  0xff;
   }

//event_report.c
    include <stdint.h>
    #include <string.h>
    #include "event_report.h"
    #include "read_sensor.h"


    #define TRUE 1
    #define FALSE 0

    extern char status ;
    extern uint8_t flag;

    void read_distance(void)
    {
        uint8_t count;
        uint8_t value;
        uint8_t flag_count = 0;
        for (count = 0; count < 3; count ++)
        {
            value = read_sensor();
            if ( value < 100 ) 
            {
                flag_count++;
            }  
        }

        if ( flag_count == 3) 
        {
            flag = TRUE;
        } 
        else
        {
            flag = FALSE;    
        }    
    }

使用

inspect.getmembers（）

检查后，我得到以下结果：

 [('_FuncPtr', <class 'ctypes._FuncPtr'>), ('__class__', <class
 'ctypes.CDLL'>), ('__delattr__', <method-wrapper '__delattr__' of
 CDLL object at 0xffa87eec>), ('__dict__', {'_FuncPtr': <class
 'ctypes._FuncPtr'>, '_handle': 1690304512, '_name':
 'd:/test_pytest/test_sensor_report/event_report.so'}),
 ('__doc__', "An instance of this class represents a loaded
  dll/shared\n    library, exporting functions using the standard C
  calling\n    convention (named 'cdecl' on Windows).\n\n    The
  exported functions can be accessed as attributes, or by\n
  indexing with the function name.  Examples:\n\n    <obj>.qsort ->
  callable object\n    <obj>['qsort'] -> callable object\n\n
  Calling the functions releases the Python GIL during the call
  and\n    reacquires it afterwards.\n    "), ('__format__',
  <built-in method __format__ of CDLL object at 0xffa87eec>),
  ('__getattr__', <bound method CDLL.__getattr__ of <CDLL
    'd:/test_pytest/test_sensor_report/event_report.so', handle
    64c00000 at ffa87eec>>), ('__getattribute__', <method-wrapper
        '__getattribute__' of CDLL object at 0xffa87eec>),
    ('__getitem__', <bound method CDLL.__getitem__ of <CDLL
     'd:/test_pytest/test_sensor_report/event_report.so', handle
     64c00000 at ffa87eec>>), ('__hash__', <method-wrapper
         '__hash__' of CDLL object at 0xffa87eec>), ('__init__',
             <bound method CDLL.__init__ of <CDLL
             'd:/test_pytest/test_sensor_report/event_report.so',
             handle 64c00000 at ffa87eec>>), ('__module__', 'ctypes'),
         ('__new__', <built-in method __new__ of type object at
          0x3d35b600>), ('__reduce__', <built-in method __reduce__ of
              CDLL object at 0xffa87eec>), ('__reduce_ex__', <built-in
                  method __reduce_ex__ of CDLL object at 0xffa87eec>),
              ('__repr__', <bound method CDLL.__repr__ of <CDLL
                'd:/test_pytest/test_sensor_report/event_report.so',
                handle 64c00000 at ffa87eec>>), ('__setattr__',
                    <method-wrapper '__setattr__' of CDLL object at
                    0xffa87eec>), ('__sizeof__', <built-in method
                        __sizeof__ of CDLL object at 0xffa87eec>),
                    ('__str__', <method-wrapper '__str__' of CDLL object
                     at 0xffa87eec>), ('__subclasshook__', <built-in
                         method __subclasshook__ of type object at
                         0xffae8204>), ('__weakref__', None),
                     ('_func_flags_', 1), ('_func_restype_', <class
                             'ctypes.c_long'>), ('_handle', 1690304512),
                     ('_name',
                      'd:/test_pytest/test_sensor_report/event_report.so')]

[（“函数”）、（“类”、（“类”、）、（“属性”、）、（“命令”、（“函数”）：、“句柄”：1690304512、“名称”：
'd:/test_pytest/test_sensor_report/event_report.so'}），
（“文档”，此类的实例表示已加载的
dll/shared\n库，使用标准C导出函数
正在调用\n约定（在Windows上命名为“cdecl”。\n\n
导出的函数可以作为属性访问，也可以通过\n
使用函数名编制索引。示例：\n\n.qsort->
可调用对象\n['qsort']->可调用对象\n\n
调用函数会在调用过程中释放Python GIL
然后\n重新获取它。\n“，（“格式”，
),
("获取属性","获取属性",，
("获取项目","散列","初始化",，
)，（“模块”、“ctypes”），
(新),(减少),(减少),(减少),(增加),，
("报告","","设置属性",，
)",("大小",),，
("结构","子类钩","无",，
（“功能标志”，1），（“功能重新类型”），（“句柄”，1690304512），
（“你的名字”，
'd:/test\u pytest/test\u sensor\u report/event\u report.so'）]

如果你嘲笑它，你就假装它是可靠的。或者至少不要在使用模拟的测试中测试模拟的功能

完全模拟C函数没有意义，不需要加载SO对象

---

Mock self.event并向其添加Mock实例“read_sensor”，使用Mock

你能提供一段代码来看看你是如何包含你的C库的吗？我把它添加到了原始问题中，这在理论上是可能的，至少如果C函数没有声明为“静态”的话。我不确定它是否是由任何模拟框架完成的。如果您检查self.event，您会看到什么？（使用inspect模块）我将其添加到原始问题中。如果他完全模拟self.event，他不会模拟所有的c函数吗？根据您的建议，如何测试c函数？也许我不理解你。

 [('_FuncPtr', <class 'ctypes._FuncPtr'>), ('__class__', <class
 'ctypes.CDLL'>), ('__delattr__', <method-wrapper '__delattr__' of
 CDLL object at 0xffa87eec>), ('__dict__', {'_FuncPtr': <class
 'ctypes._FuncPtr'>, '_handle': 1690304512, '_name':
 'd:/test_pytest/test_sensor_report/event_report.so'}),
 ('__doc__', "An instance of this class represents a loaded
  dll/shared\n    library, exporting functions using the standard C
  calling\n    convention (named 'cdecl' on Windows).\n\n    The
  exported functions can be accessed as attributes, or by\n
  indexing with the function name.  Examples:\n\n    <obj>.qsort ->
  callable object\n    <obj>['qsort'] -> callable object\n\n
  Calling the functions releases the Python GIL during the call
  and\n    reacquires it afterwards.\n    "), ('__format__',
  <built-in method __format__ of CDLL object at 0xffa87eec>),
  ('__getattr__', <bound method CDLL.__getattr__ of <CDLL
    'd:/test_pytest/test_sensor_report/event_report.so', handle
    64c00000 at ffa87eec>>), ('__getattribute__', <method-wrapper
        '__getattribute__' of CDLL object at 0xffa87eec>),
    ('__getitem__', <bound method CDLL.__getitem__ of <CDLL
     'd:/test_pytest/test_sensor_report/event_report.so', handle
     64c00000 at ffa87eec>>), ('__hash__', <method-wrapper
         '__hash__' of CDLL object at 0xffa87eec>), ('__init__',
             <bound method CDLL.__init__ of <CDLL
             'd:/test_pytest/test_sensor_report/event_report.so',
             handle 64c00000 at ffa87eec>>), ('__module__', 'ctypes'),
         ('__new__', <built-in method __new__ of type object at
          0x3d35b600>), ('__reduce__', <built-in method __reduce__ of
              CDLL object at 0xffa87eec>), ('__reduce_ex__', <built-in
                  method __reduce_ex__ of CDLL object at 0xffa87eec>),
              ('__repr__', <bound method CDLL.__repr__ of <CDLL
                'd:/test_pytest/test_sensor_report/event_report.so',
                handle 64c00000 at ffa87eec>>), ('__setattr__',
                    <method-wrapper '__setattr__' of CDLL object at
                    0xffa87eec>), ('__sizeof__', <built-in method
                        __sizeof__ of CDLL object at 0xffa87eec>),
                    ('__str__', <method-wrapper '__str__' of CDLL object
                     at 0xffa87eec>), ('__subclasshook__', <built-in
                         method __subclasshook__ of type object at
                         0xffae8204>), ('__weakref__', None),
                     ('_func_flags_', 1), ('_func_restype_', <class
                             'ctypes.c_long'>), ('_handle', 1690304512),
                     ('_name',
                      'd:/test_pytest/test_sensor_report/event_report.so')]