[AIRFLOW-5852] Make tests.www pylint compatible

[turbaszek]

Make sure you have checked all steps below.

Jira

• My PR addresses the following Airflow Jira issues and references them in the PR title. For example, "[AIRFLOW-XXX] My Airflow PR"
  • https://issues.apache.org/jira/browse/AIRFLOW-5852

Description

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Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

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  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

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[turbaszek]

@mik-laj @potiuk @ashb what do you think about ignoring this class? Otherwise we will have to disable no-member.

[feluelle]

+1 for ignoring this class.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@5096fa3). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #6504   +/-   ##
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  Coverage          ?   83.64%           
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  Files             ?      635           
  Lines             ?    36679           
  Branches          ?        0           
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  Hits              ?    30681           
  Misses            ?     5998           
  Partials          ?        0

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[potiuk]

+1 as well.