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yamllint/tests
Adrien Vergé ebd6b90d3e anchors: Add new rule to detect undeclared or duplicated anchors
According to the YAML specification [^1]:

- > It is an error for an alias node to use an anchor that does not
  > previously occur in the document.

  The `forbid-undeclared-aliases` option checks that aliases do have a
  matching anchor declared previously in the document. Since this is
  required by the YAML spec, this option is enabled by default.

- > The alias refers to the most recent preceding node having the same
  > anchor.

  This means that having a same anchor repeated in a document is
  allowed. However users could want to avoid this, so the new option
  `forbid-duplicated-anchors` allows that. It's disabled by default.

- > It is not an error to specify an anchor that is not used by any
  > alias node.

  This means that it's OK to declare anchors but don't have any alias
  referencing them. However users could want to avoid this, so a new
  option (e.g. `forbid-unused-anchors`) could be implemented in the
  future. See https://github.com/adrienverge/yamllint/pull/537.

Fixes #395
Closes #420

[^1]: https://yaml.org/spec/1.2.2/#71-alias-nodes
2 years ago
..
rules anchors: Add new rule to detect undeclared or duplicated anchors 2 years ago
yaml-1.2-spec-examples Tests: Remove ghost character from YAML spec example 9 years ago
__init__.py refactor: Remove UTF-8 headers in Python files 3 years ago
common.py tests: Increase test coverage 3 years ago
test_cli.py cli: Add --list-files command line option 2 years ago
test_config.py configuration: Allow using a list of strings in ignore configuration 2 years ago
test_linter.py Remove Unicode marker before strings 2 years ago
test_module.py refactor: Remove UTF-8 headers in Python files 3 years ago
test_parser.py refactor: Remove UTF-8 headers in Python files 3 years ago
test_spec_examples.py Apply some pyupgrade suggestions 2 years ago
test_syntax_errors.py refactor: Remove UTF-8 headers in Python files 3 years ago
test_yamllint_directives.py refactor: Remove UTF-8 headers in Python files 3 years ago