Migrate remaining tests to pytest-httpserver (no reliance on https://updates.xcp-ng.org)

[bernhardkaindl]

Improvements

• Adds new test cases for xcp.repository which covers 4 additional repository code paths not covered before.
• Makes the HTTP tests work independent of https://updates.xcp-ng.org and any changes to it
• Makes it possible to run pytests tests/ run off-line or with spotty internet connection
• Makes the tests complete in half-time as the overhead of the use https://updates.xcp-ng.org is removed

Other minor improvements

• The HTTP test base class separates the concerns of HTTP testing in general from specific tests
• Improves type annotations in HTTP tests

Commits

• tests/httpserver_testcase.py: Add common base class for HTTP tests

  Add a common base class for HTTP tests using pytest_httpserver:

  • tests/test_httpaccessor.py (self-contained HTTP test for xcp.accessor)
  • tests/test_httprepository.py (self-contained HTTP test for xcp.repository)

• tests/test_httpaccessor.py: Use common class HTTPServerTestCase

  Make use of the common class HTTPServerTestCase: Many imports and methods are now provided by tests/httpserver_testcase.py

• tests/test_httprepository.py: Use local YUM and XenSource repos

  Add a new self-contained testcase for testing YUM and XenSource repos with: .treeinfo, repomd.xml, packages, packages.main, .linux and .site

  tests/data/repo provides all test data, no use of updates.xcp-ng.org, runs offline (no internet connection) and is therefore very fast.

• tests/test_{accessor,repository}.py: Remove obsoleted HTTP tests

  Remove obsolete HTTP test cases using https://updates.xcp-ng.org/ which are now replaced by new tests in tests/test_http{accessor,repository}.py

[codecov]

Codecov Report

Merging #111 (c300114) into master (c734982) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #111   +/-   ##
=======================================
  Coverage   82.73%   82.73%           
=======================================
  Files          21       21           
  Lines        3371     3371           
=======================================
  Hits         2789     2789           
  Misses        582      582           

Flag	Coverage Δ
unittest	82.73% <ø> (ø)

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