give me a example to define arguments when running pytest
时间: 2024-05-27 09:12:51 浏览: 14
Sure! When running pytest, arguments can be used to modify the behavior of the test execution. For example, you can use the "-k" argument followed by a string to select only tests whose names contain that string. So, if you have a test function named "test_addition" and you run "pytest -k addition", only that test will be executed. Another example is using the "-s" argument to disable capturing of stdout/stderr. This can be useful when debugging and you want to see print statements. So, you can run "pytest -s" to enable stdout/stderr capturing.
相关问题
give me a CODE example to define arguments when running pytest
Sure, here is an example:
```
def test_calculation():
x = 5
y = 10
assert add(x, y) == 15
def add(x, y):
return x + y
```
In this example, we define a test function `test_calculation()` that tests the `add()` function. We pass two arguments `x` and `y` to the `add()` function and expect the result to be 15. The `assert` statement verifies that the result of the `add()` function is, in fact, 15. When running `pytest`, we would define the arguments for `x` and `y` like this:
```
pytest test_example.py --x=5 --y=10
```
This would run the `test_calculation()` function with the arguments `x=5` and `y=10`.
give me an example to explain 值传递
Sure! Here's an example to explain the concept of "passing by value" in C++:
```
#include <iostream>
using namespace std;
void increment(int x) {
x++; // increment the value of x
cout << "Value of x inside the function: " << x << endl;
}
int main() {
int num = 5;
cout << "Value of num before function call: " << num << endl;
increment(num); // passing num by value to the function
cout << "Value of num after function call: " << num << endl;
return 0;
}
```
In this example, we have defined a function `increment` that takes an integer parameter `x`. Inside the function, we increment the value of `x` by 1 and print its value. In the `main` function, we define an integer variable `num` and initialize it to 5. We then print the value of `num`, call the `increment` function, and print the value of `num` again.
When we pass `num` to the `increment` function, a copy of the value of `num` is created and passed to the function. This means that any changes made to `x` inside the function do not affect the value of `num` outside the function. So, even though we increment the value of `x` inside the function, the value of `num` remains unchanged outside the function.
When we run the above code, the output will be:
```
Value of num before function call: 5
Value of x inside the function: 6
Value of num after function call: 5
```
As you can see, the value of `num` remains unchanged after the function call, even though we incremented the value of `x` inside the function. This is because `num` was passed to the function by value, and any changes made to the value of `x` inside the function do not affect the value of `num` outside the function.
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