/
hash_transform_values_spec.rb
253 lines (211 loc) · 7.7 KB
/
hash_transform_values_spec.rb
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# frozen_string_literal: true
RSpec.describe RuboCop::Cop::Style::HashTransformValues, :config do
context 'with inline block' do
it 'flags each_with_object when transform_values could be used' do
expect_offense(<<~RUBY)
x.each_with_object({}) {|(k, v), h| h[k] = foo(v)}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer `transform_values` over `each_with_object`.
RUBY
expect_correction(<<~RUBY)
x.transform_values {|v| foo(v)}
RUBY
end
end
context 'with multiline block' do
it 'flags each_with_object when transform_values could be used' do
expect_offense(<<~RUBY)
some_hash.each_with_object({}) do |(key, val), memo|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer `transform_values` over `each_with_object`.
memo[key] = val * val
end
RUBY
expect_correction(<<~RUBY)
some_hash.transform_values do |val|
val * val
end
RUBY
end
end
context 'with safe navigation operator' do
it 'flags each_with_object when transform_values could be used' do
expect_offense(<<~RUBY)
x&.each_with_object({}) {|(k, v), h| h[k] = foo(v)}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer `transform_values` over `each_with_object`.
RUBY
expect_correction(<<~RUBY)
x&.transform_values {|v| foo(v)}
RUBY
end
end
it 'does not flag each_with_object when both key & value are transformed' do
expect_no_offenses(<<~RUBY)
x.each_with_object({}) {|(k, v), h| h[k.to_sym] = foo(v)}
RUBY
end
it 'does not flag each_with_object when value transformation uses key' do
expect_no_offenses('x.each_with_object({}) {|(k, v), h| h[k] = k.to_s}')
end
it 'does not flag each_with_object when no transformation occurs' do
expect_no_offenses('x.each_with_object({}) {|(k, v), h| h[k] = v}')
end
it 'does not flag each_with_object when its argument is not modified' do
expect_no_offenses(<<~RUBY)
x.each_with_object({}) {|(k, v), h| other_h[k] = v * v}
RUBY
end
it 'does not flag `each_with_object` when its argument is used in the value' do
expect_no_offenses(<<~RUBY)
x.each_with_object({}) { |(k, v), h| h[k] = h.count }
RUBY
end
it 'does not flag each_with_object when receiver is array literal' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].each_with_object({}) {|(k, v), h| h[k] = foo(v)}
RUBY
end
it 'does not flag `each_with_object` when its receiver is `each_with_index`' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].each_with_index.each_with_object({}) { |(k, v), h| h[k] = foo(v) }
RUBY
end
it 'does not flag `each_with_object` when its receiver is `with_index`' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].each.with_index.each_with_object({}) { |(k, v), h| h[k] = foo(v) }
RUBY
end
it 'does not flag `each_with_object` when its receiver is `zip`' do
expect_no_offenses(<<~RUBY)
%i[a b c].zip([1, 2, 3]).each_with_object({}) { |(k, v), h| h[k] = foo(v) }
RUBY
end
it 'flags _.map {...}.to_h when transform_values could be used' do
expect_offense(<<~RUBY)
x.map {|k, v| [k, foo(v)]}.to_h
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer `transform_values` over `map {...}.to_h`.
RUBY
expect_correction(<<~RUBY)
x.transform_values {|v| foo(v)}
RUBY
end
it 'flags _.map {...}.to_h when transform_values could be used ' \
'when line break before `to_h`' do
expect_offense(<<~RUBY)
x.map {|k, v| [k, foo(v)]}.
^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer `transform_values` over `map {...}.to_h`.
to_h
RUBY
expect_correction(<<~RUBY)
x.transform_values {|v| foo(v)}
RUBY
end
it 'does not flag _.map{...}.to_h when both key & value are transformed' do
expect_no_offenses('x.map {|k, v| [k.to_sym, foo(v)]}.to_h')
end
it 'flags Hash[_.map{...}] when transform_values could be used' do
expect_offense(<<~RUBY)
Hash[x.map {|k, v| [k, foo(v)]}]
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer `transform_values` over `Hash[_.map {...}]`.
RUBY
expect_correction(<<~RUBY)
x.transform_values {|v| foo(v)}
RUBY
end
it 'does not flag Hash[_.map{...}] when both key & value are transformed' do
expect_no_offenses('Hash[x.map {|k, v| [k.to_sym, foo(v)]}]')
end
it 'does not flag value transformation in the absence of to_h' do
expect_no_offenses('x.map {|k, v| [k, foo(v)]}')
end
it 'does not flag value transformation when receiver is array literal' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].map {|k, v| [k, foo(v)]}.to_h
RUBY
end
it 'does not flag `_.map{...}.to_h` when its receiver is `each_with_index`' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].each_with_index.map { |k, v| [k, foo(v)] }.to_h
RUBY
end
it 'does not flag `_.map{...}.to_h` when its receiver is `with_index`' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].each.with_index.map { |k, v| [k, foo(v)] }.to_h
RUBY
end
it 'does not flag `_.map{...}.to_h` when its receiver is `zip`' do
expect_no_offenses(<<~RUBY)
%i[a b c].zip([1, 2, 3]).map { |k, v| [k, foo(v)] }.to_h
RUBY
end
it 'correctly autocorrects _.map{...}.to_h with block' do
expect_offense(<<~RUBY)
{a: 1, b: 2}.map {|k, v| [k, foo(v)]}.to_h {|k, v| [v, k]}
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer `transform_values` over `map {...}.to_h`.
RUBY
expect_correction(<<~RUBY)
{a: 1, b: 2}.transform_values {|v| foo(v)}.to_h {|k, v| [v, k]}
RUBY
end
it 'does not flag `Hash[_.map{...}]` when its receiver is an array literal' do
expect_no_offenses(<<~RUBY)
Hash[[1, 2, 3].map { |k, v| [k, foo(v)] }]
RUBY
end
it 'does not flag `Hash[_.map{...}]` when its receiver is `each_with_index`' do
expect_no_offenses(<<~RUBY)
Hash[[1, 2, 3].each_with_index.map { |k, v| [k, foo(v)] }]
RUBY
end
it 'does not flag `Hash[_.map{...}]` when its receiver is `with_index`' do
expect_no_offenses(<<~RUBY)
Hash[[1, 2, 3].each.with_index.map { |k, v| [k, foo(v)] }]
RUBY
end
it 'does not flag `Hash[_.map{...}]` when its receiver is `zip`' do
expect_no_offenses(<<~RUBY)
Hash[%i[a b c].zip([1, 2, 3]).map { |k, v| [k, foo(v)] }]
RUBY
end
context 'when using Ruby 2.6 or newer', :ruby26 do
it 'flags _.to_h{...} when transform_values could be used' do
expect_offense(<<~RUBY)
x.to_h {|k, v| [k, foo(v)]}
^^^^^^^^^^^^^^^^^^^^^^^^^^^ Prefer `transform_values` over `to_h {...}`.
RUBY
expect_correction(<<~RUBY)
x.transform_values {|v| foo(v)}
RUBY
end
it 'does not flag `_.to_h{...}` when both key & value are transformed' do
expect_no_offenses(<<~RUBY)
x.to_h { |k, v| [k.to_sym, foo(v)] }
RUBY
end
it 'does not flag `_.to_h{...}` when its receiver is an array literal' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].to_h { |k, v| [k, foo(v)] }
RUBY
end
it 'does not flag `_.to_h{...}` when its receiver is `each_with_index`' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].each_with_index.to_h { |k, v| [k, foo(v)] }
RUBY
end
it 'does not flag `_.to_h{...}` when its receiver is `with_index`' do
expect_no_offenses(<<~RUBY)
[1, 2, 3].each.with_index.to_h { |k, v| [k, foo(v)] }
RUBY
end
it 'does not flag `_.to_h{...}` when its receiver is `zip`' do
expect_no_offenses(<<~RUBY)
%i[a b c].zip([1, 2, 3]).to_h { |k, v| [k, foo(v)] }
RUBY
end
end
context 'below Ruby 2.6', :ruby25 do
it 'does not flag _.to_h{...}' do
expect_no_offenses(<<~RUBY)
x.to_h {|k, v| [k, foo(v)]}
RUBY
end
end
end