Tests: 8XXX used as default port range.

After the launch of the project, the testing infrastructure was shared with
nginx project in some cases. To avoid port overlap, a decision was made
to shift

Tests: 8XXX used as default port range.

After the launch of the project, the testing infrastructure was shared with
nginx project in some cases. To avoid port overlap, a decision was made
to shift the port range for Unit tests. This problem was resolved a long time
ago and is no longer relevant, so it is now safe to use port 8XXX range as the
default, as it is more appropriate for testing purposes.

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Tests: get rid of classes in test files.

Class usage came from the unittest framework and it was always redundant
after migration to the pytest. This commit removes classes from files
containing te

Tests: get rid of classes in test files.

Class usage came from the unittest framework and it was always redundant
after migration to the pytest. This commit removes classes from files
containing tests to make them more readable and understandable.

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Tests: prerequisites checking reworked.

Prerequisites check moved to the module level to simplify class structure.
Discovery and prerequisites checks functions moved to the separate files.
Introduce

Tests: prerequisites checking reworked.

Prerequisites check moved to the module level to simplify class structure.
Discovery and prerequisites checks functions moved to the separate files.
Introduced "require" fixture to provide per-test requirements check.

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Tests: unified setup method usage.

To make fixtures accessible inside of setup methods in tests all these methods
are renamed to the "setup_method_fixture" and decorated by autouse flag.

Also all s

Tests: unified setup method usage.

To make fixtures accessible inside of setup methods in tests all these methods
are renamed to the "setup_method_fixture" and decorated by autouse flag.

Also all setup methods moved to the top of the files.

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Tests: removed unused variables.

Tests: switched to using f-strings.

Previously, it was necessary to support older versions of Python for
compatibility. F-strings were released in Python 3.6. Python 3.5 was
marked as unsupported

Tests: switched to using f-strings.

Previously, it was necessary to support older versions of Python for
compatibility. F-strings were released in Python 3.6. Python 3.5 was
marked as unsupported by the end of 2020, so now it's possible to start
using f-strings safely for better readability and performance.

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Tests: Added tests for empty "location".

Tests: Added tests for variables in "location".

Tests: Changed tests to accept variables in "location".

Tests: fixed unit.log print.

Tests: migrated to the pytest.

Tests: style.

Tests: minor fixes.

Tests: added tests for rational numbers in upstream server weight.

Tests: added tests for "location" option.

Tests: added tests for "return" action.