pytest-bdd 中是否有“before_feature”的钩子？

Question

要求是基于在功能级别定义的自定义标签，针对功能文件中的所有场景运行代码“一次”。我已经在 pytest.ini 中定义了自定义标签。 但是，以下代码会针对功能文件中的每个场景执行。无论功能文件中有多少场景，我都只需要执行一次：

@pytest.hookimpl()
@pytest.mark.tag_is_at_feature_level
def pytest_bdd_before_scenario(request, feature, scenario):
    if "tag_is_at_feature_level" in feature.tags:
        print(f"This process should run only once regardless of how many scenarios in the feature file...")

这是功能文件：

@tag_is_at_feature_level
Feature: TableStructureValidation
     This feature is to validate table structure

        Scenario: Table Structure Validation - table_name
             When I query the INFORMATION_SCHEMA.COLUMNS for the table "table_name" from the databse "database_name"
             Then I should see following table definition in the INFORMATION_SCHEMA.COLUMNS:
                  | COLUMN_NAME         | COLUMN_DEFAULT | IS_NULLABLE | DATA_TYPE | 
                  | FileName            |                | YES         | varchar   | 
                  | TotalRowsSourceFile |                | YES         | bigint    | 
                  | TotalRowsLoadedToDB |                | YES         | bigint    | 
                  | Validation          |                | YES         | varchar   | 
                  | LoadTime            | (getdate())    | YES         | datetime  | 

Answer 1

import pytest
from pytest_bdd import scenario, given, when, then, parsers

# Define a fixture that checks for the custom tag and runs once per feature
@pytest.fixture(scope="session")
def check_feature_tag(request):
    feature_tags = request.node.iter_markers_with_node(name='tag_is_at_feature_level')
    has_tag = any(node for marker, node in feature_tags if node.parent is None)  # Check if the tag is at the feature level
    if has_tag:
        print("This process should run only once regardless of how many scenarios in the feature file.")

# Use the fixture in your scenarios
@scenario('your_feature_file.feature', 'Table Structure Validation - table_name')
def test_table_structure():
    pass

@given("I query the INFORMATION_SCHEMA.COLUMNS for the table 'table_name' from the database 'database_name'")
def step_impl():
    # Your step implementation here
    pass

@then("I should see following table definition in the INFORMATION_SCHEMA.COLUMNS:")
def step_impl():
    # Your step implementation here
    pass

# Make sure to use the fixture in the test function
def test_features(check_feature_tag):
    # This test function will use the fixture that runs once per feature
    pass