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我已经开始使用行为来定义 Python3 上的行为驱动测试。第一次测试很顺利，但现在我遇到了一个最令人费解的错误。

我已经定义了这个 Gherkin 文件sra-to-isatab-batch-conversion.feature：

Feature: SRA to ISA-tab Batch conversion
# perform a batch conversion of a set of SRA datasets, retrieved from the European Nucleotide Archive
# to ISA-tab

Scenario: Batch conversion form a list of SRA accession numbers
 Given An access number "ERA000084"
 And nothing else
 When the SRA to ISA tab conversion is invoked
 Then it should return a ZIP file object
 And the ZIP file should contain as many directories as the element in the list

然后我在一个文件中定义以下步骤方法steps/sra-to-isatab-batch-conversion.py

from behave import *

use_step_matcher("parse")


@given('An access number "{access_number}"')
def step_impl(context, access_number):
    context.access_number = access_number
    print(context.access_number)

@step("nothing else")
def step_impl(context):
    print("Nothing else") 


@when("the SRA to ISA tab conversion is invoked")
def step_impl(context):
 pass


@then("it should return a ZIP file object")
def step_impl(context):
    pass


@step("the ZIP file should contain as many directories as the element in the list")
def step_impl(context):
    pass

如果我然后运行behave sra-to-isatab-conversion.feature与该步骤相关的步骤功能，则when似乎缺少：

Feature: SRA to ISA-tab Batch conversion # sra-to-isatab-batch-conversion.feature:2

Scenario: Batch conversion form a list of SRA accession numbers                  # sra-to-isatab-batch-conversion.feature:6
Given An access number "ERA000084"                                             # steps/sra-to-isatab-batch-conversion.py:6 0.000s
And nothing else                                                               # steps/sra-to-isatab-batch-conversion.py:40 0.000s
When the SRA to ISA tab conversion is invoked                                  # None
Then it should return a ZIP file object                                        # None
And the ZIP file should contain as many directories as the element in the list # None

/Users/massi/Projects/oerc/isa-api/features/test_outputs

Failing scenarios:
  sra-to-isatab-batch-conversion.feature:6  Batch conversion form a list of SRA accession numbers

0 features passed, 1 failed, 0 skipped
0 scenarios passed, 1 failed, 0 skipped
2 steps passed, 0 failed, 2 skipped, 1 undefined
Took 0m0.001s

You can implement step definitions for undefined steps with these snippets:

@when(u'the SRA to ISA tab conversion is invoked')
def step_impl(context):
    raise NotImplementedError(u'STEP: When the SRA to ISA tab conversion is invoked')`

我试图重新定义步骤描述更改给定语句的数量，我什至重写了文件，但我总是得到同样的错误。即使我复制错误消息中建议的语句，我仍然会遇到同样的错误。

谁能解释我做错了什么？我正在使用 Python 3.4 Behave 1.2.5 PyCharm 5.0.4（请注意，PyCharm BDD 工具可以识别 Gherkin 文件中的语句与步骤函数之间的匹配）

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1 回答 1

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嗯，正如您在上面粘贴的那样，它目前对我来说工作得很好。可能是环境问题或安装问题。您可以尝试重新安装行为吗？您是从终端还是从 pycharm 运行它？

PS：不是问题，但是如果你使用 parse，你不需要指定 use_step_matcher() 方法；因为它是默认的step_matcher

另外（确保不是您粘贴的人为错误）：您的@when step 方法在“pass”语句中存在缩进问题。您的代码中是否真的像这样，或者只是论坛中的格式问题？

于 2016-02-09T20:27:36.537 回答