{
"comparison_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the correct result at the comparison boundary in ##{method_name}' do
# Test with values where the original operator and mutated operator
# produce different results (e.g., equal values for > vs >=)
result = subject.#{method_name}(boundary_value)
expect(result).to eq(expected)
end
RSPEC
},
"arithmetic_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'computes the correct arithmetic result in ##{method_name}' do
# Assert the exact numeric result, not just truthiness or sign
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"boolean_operator_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the correct result when one condition is true and one is false in ##{method_name}' do
# Use inputs where only one operand is truthy to distinguish && from ||
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"boolean_literal_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the expected boolean value from ##{method_name}' do
# Assert the exact true/false/nil value, not just truthiness
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"negation_insertion" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the correct boolean from the predicate in ##{method_name}' do
# Assert the exact true/false result, not just truthiness
result = subject.#{method_name}(input_value)
expect(result).to eq(true).or eq(false)
end
RSPEC
},
"integer_literal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the exact integer value from ##{method_name}' do
# Assert the exact numeric value, not just > 0 or truthy
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"float_literal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the exact float value from ##{method_name}' do
# Assert the exact floating-point result
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"string_literal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the exact string content from ##{method_name}' do
# Assert the exact string value, not just presence or non-empty
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"symbol_literal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the exact symbol from ##{method_name}' do
# Assert the exact symbol value, not just that it is a Symbol
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"array_literal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the expected array contents from ##{method_name}' do
# Assert the exact array elements, not just non-empty or truthy
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"hash_literal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns the expected hash contents from ##{method_name}' do
# Assert the exact keys and values, not just non-empty or truthy
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"collection_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'uses the return value of the collection operation in ##{method_name}' do
# Assert the return value of the collection method, not just side effects
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"conditional_negation" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'exercises both branches of the conditional in ##{method_name}' do
# Test with inputs that make the condition true AND false
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"conditional_branch" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'exercises the removed branch of the conditional in ##{method_name}' do
# Test with inputs that trigger the branch removed by this mutation
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"statement_deletion" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, _mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: deleted `#{original_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'depends on the side effect of the deleted statement in ##{method_name}' do
# Assert a side effect or return value that changes when this statement is removed
subject.#{method_name}(input_value)
expect(observable_side_effect).to eq(expected)
end
RSPEC
},
"method_body_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the return value or side effects of ##{method_name}' do
# Assert the method produces a meaningful result, not just nil
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"return_value_removal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'uses the return value of ##{method_name}' do
# Assert the caller depends on the return value, not just side effects
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"method_call_removal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'depends on the return value or side effect of the call in ##{method_name}' do
# Assert the method call's effect is observable
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"compound_assignment" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the compound assignment side effect in ##{method_name}' do
# Assert the accumulated value after the compound assignment
# The mutation changes the operator, so the final value will differ
subject.#{method_name}(input_value)
expect(observable_side_effect).to eq(expected)
end
RSPEC
},
"nil_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'asserts the nil return value from ##{method_name}' do
# Assert the method returns nil, not a substituted value
result = subject.#{method_name}(input_value)
expect(result).to be_nil
end
RSPEC
},
"superclass_removal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, _mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: removed superclass from `#{original_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'depends on inherited behavior in ##{method_name}' do
# Assert behavior that comes from the superclass
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"local_variable_assignment" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the local variable assignment is used in ##{method_name}' do
# Assert that the assigned variable is read later, not just the value expression
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"instance_variable_write" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the instance variable @state is set correctly in ##{method_name}' do
# Assert that the instance variable holds the expected value after the method runs
subject.#{method_name}(input_value)
expect(subject.instance_variable_get(:@variable)).to eq(expected)
end
RSPEC
},
"class_variable_write" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the class variable @@shared state is set correctly in ##{method_name}' do
# Assert that the class variable holds the expected value and affects shared state
subject.#{method_name}(input_value)
expect(described_class.class_variable_get(:@@variable)).to eq(expected)
end
RSPEC
},
"global_variable_write" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the global variable $state is set correctly in ##{method_name}' do
# Assert that the global variable holds the expected value after the method runs
subject.#{method_name}(input_value)
expect($variable).to eq(expected)
end
RSPEC
},
"mixin_removal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, _mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: removed `#{original_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'depends on behavior from the included module in ##{method_name}' do
# Assert behavior provided by the mixin
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"rescue_removal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, _mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: removed `#{original_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the rescue handler is needed in ##{method_name}' do
# Trigger the rescued exception and assert the handler's effect
result = subject.#{method_name}(input_that_raises)
expect(result).to eq(expected)
end
RSPEC
},
"rescue_body_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the rescue handler produces the correct result in ##{method_name}' do
# Trigger the exception and assert the rescue body's return value or side effect
result = subject.#{method_name}(input_that_raises)
expect(result).to eq(expected)
end
RSPEC
},
"inline_rescue" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the inline rescue fallback value in ##{method_name}' do
# Trigger the exception and assert the fallback value is correct
result = subject.#{method_name}(input_that_raises)
expect(result).to eq(expected)
end
RSPEC
},
"ensure_removal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, _mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: removed ensure block `#{original_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the ensure cleanup runs in ##{method_name}' do
# Assert that the cleanup side effect is observable after the method runs
subject.#{method_name}(input_value)
expect(observable_cleanup_effect).to eq(expected)
end
RSPEC
},
"break_statement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the break exits the loop correctly in ##{method_name}' do
# Assert the loop exits early and returns the expected value
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"next_statement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the next skips the iteration correctly in ##{method_name}' do
# Assert the iteration is skipped and the expected value is yielded
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"redo_statement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the redo retry logic is necessary in ##{method_name}' do
# Assert the iteration restart changes the outcome
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"bitwise_replacement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the exact bitwise result in ##{method_name}' do
# Assert the exact bit-level result to distinguish &, |, and ^ operators
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"bitwise_complement" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the bitwise complement result in ##{method_name}' do
# Assert the exact complement (~) value, not just sign or magnitude
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"bang_method" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies in-place vs copy semantics matter in ##{method_name}' do
# Assert that the original object is or is not modified
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"zsuper_removal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies inherited behavior from super is needed in ##{method_name}' do
# Assert that the result depends on the superclass implementation
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"explicit_super_mutation" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the correct arguments are passed to super in ##{method_name}' do
# Assert the inherited method receives the expected arguments
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"index_to_fetch" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'distinguishes [] from .fetch for missing keys in ##{method_name}' do
# Access a missing key: [] returns nil, .fetch raises KeyError
expect { subject.#{method_name}(collection_with_missing_key) }.to raise_error(KeyError)
end
RSPEC
},
"index_to_dig" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the chained [] access returns the correct nested value in ##{method_name}' do
# Assert the nested lookup produces the expected value
result = subject.#{method_name}(nested_collection)
expect(result).to eq(expected)
end
RSPEC
},
"index_assignment_removal" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the []= assignment modifies the collection in ##{method_name}' do
# Assert the collection contains the assigned value after the method runs
result = subject.#{method_name}(collection)
expect(result).to include(expected_key => expected_value)
end
RSPEC
},
"pattern_matching_guard" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies the pattern guard filters correctly in ##{method_name}' do
# Test with input that matches the pattern but fails the guard condition
# The guard should prevent matching, routing to a different branch
result = subject.#{method_name}(input_matching_pattern_but_failing_guard)
expect(result).to eq(expected)
end
RSPEC
},
"pattern_matching_alternative" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies each pattern alternative is reachable in ##{method_name}' do
# Test with input that matches only one specific alternative
# Each alternative should have a dedicated test case
result = subject.#{method_name}(input_for_specific_alternative)
expect(result).to eq(expected)
end
RSPEC
},
"collection_return" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns a non-empty collection from ##{method_name}' do
# Assert the collection has the expected elements, not just non-empty
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"scalar_return" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'returns a non-zero/non-empty value from ##{method_name}' do
# Assert the exact scalar value, not just presence or type
result = subject.#{method_name}(input_value)
expect(result).to eq(expected)
end
RSPEC
},
"pattern_matching_array" => lambda { |mutation|
method_name = H.parse_method_name(mutation.subject.name)
original_line, mutated_line = H.(mutation.diff)
<<~RSPEC.strip
# Mutation: changed `#{original_line}` to `#{mutated_line}` in #{mutation.subject.name}
# #{mutation.file_path}:#{mutation.line}
it 'verifies each array pattern element matters in ##{method_name}' do
# Test with input where changing one element type causes a different match
# Each position in the array pattern should be validated
result = subject.#{method_name}(input_with_wrong_element_type)
expect(result).to eq(expected)
end
RSPEC
}
}.freeze