Sourced from mutant's changelog.

v0.10.20 2020-12-16

#1159 #1160

• Substantially improve performance on coverage attempts that involve many selected tests.
• Reduce (but not eliminate) performance degeneration on larger subject sets.
• This release for many average cases should get 2x the performance.

v0.10.19 2020-12-14

• #1158

  • Change to strict integration version bounds.
  • Mutant is evolving the integration interface, and will keep doing so.
  • Before this change integrations would declare they can work with many future mutant releases, but this is actually not the case.

• #1155

  • Add defined?(@a) -> instance_variable_defined?(:@a) mutation.
  • Remove invalid mutations from defined? -> true.
  • Remove mutations of defined?() arguments, the defined? method is not fully evaluating the argument but instead partially evaluates the AST, or inspects the AST. Delegating to the value semantics based "generic" mutation engine does create too many hard to cover mutations.

v0.10.18 2020-12-13

• #1151

  • Add support for unicode ruby method names.
  • Fixes long standing bug on expression parsing of method operators. This means that mutant is now selecting a more narrow / correct set of tests for operators. As a side effect measure coverage may drop. But for a good reason as mutant before would select way more tests even if a specific test for such an operator was available. Enforcing that this specific test actually covers the subject.

• #1152

  • Fix matching non existing constants.

• #1153

  • Improve minitest integration to also render minitest failures in reports. This is useful when reacting to noop errors.

• #1154

... (truncated)

• 5309cc1 Merge pull request #1159 from mbj/simplify/expression
• bef03dd Change version to 0.10.20
• c01ad7b Change expression details to avoid memoization
• 2af00e3 Merge pull request #1160 from mbj/change/to-narrow-interface
• b6b1c16 Change to narrow test integration interface
• 9dd0e56 Merge pull request #1158 from mbj/fix/required-mutant-version
• 18a5dba Change to version 0.10.19
• fed97f9 Change to strict integration version bounds
• f5db70b Merge pull request #1155 from mbj/add-ivar-defined-mutation
• 5149900 Fix whitespace
• Additional commits viewable in compare view

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