/
block_delimiters_spec.rb
642 lines (548 loc) · 16.4 KB
/
block_delimiters_spec.rb
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# frozen_string_literal: true
RSpec.describe RuboCop::Cop::Style::BlockDelimiters, :config do
subject(:cop) { described_class.new(config) }
shared_examples 'syntactic styles' do
it 'registers an offense for a single line block with do-end' do
expect_offense(<<-RUBY.strip_indent)
each do |x| end
^^ Prefer `{...}` over `do...end` for single-line blocks.
RUBY
end
it 'accepts a single line block with braces' do
expect_no_offenses('each { |x| }')
end
it 'accepts a multi-line block with do-end' do
expect_no_offenses(<<-RUBY.strip_indent)
each do |x|
end
RUBY
end
it 'accepts a multi-line block that needs braces to be valid ruby' do
expect_no_offenses(<<-RUBY.strip_indent)
puts [1, 2, 3].map { |n|
n * n
}, 1
RUBY
end
end
context 'Semantic style' do
cop_config = {
'EnforcedStyle' => 'semantic',
'ProceduralMethods' => %w[tap],
'FunctionalMethods' => %w[let],
'IgnoredMethods' => %w[lambda]
}
let(:cop_config) { cop_config }
it 'accepts a multi-line block with braces if the return value is ' \
'assigned' do
expect_no_offenses(<<-RUBY.strip_indent)
foo = map { |x|
x
}
RUBY
end
it 'accepts a multi-line block with braces if it is the return value ' \
'of its scope' do
expect_no_offenses(<<-RUBY.strip_indent)
block do
map { |x|
x
}
end
RUBY
end
it 'accepts a multi-line block with braces when passed to a method' do
expect_no_offenses(<<-RUBY.strip_indent)
puts map { |x|
x
}
RUBY
end
it 'accepts a multi-line block with braces when chained' do
expect_no_offenses(<<-RUBY.strip_indent)
map { |x|
x
}.inspect
RUBY
end
it 'accepts a multi-line block with braces when passed to a known ' \
'functional method' do
expect_no_offenses(<<-RUBY.strip_indent)
let(:foo) {
x
}
RUBY
end
it 'registers an offense for a multi-line block with braces if the ' \
'return value is not used' do
expect_offense(<<-RUBY.strip_indent)
each { |x|
^ Prefer `do...end` over `{...}` for procedural blocks.
x
}
RUBY
end
it 'registers an offense for a multi-line block with do-end if the ' \
'return value is assigned' do
expect_offense(<<-RUBY.strip_indent)
foo = map do |x|
^^ Prefer `{...}` over `do...end` for functional blocks.
x
end
RUBY
end
it 'registers an offense for a multi-line block with do-end if the ' \
'return value is passed to a method' do
expect_offense(<<-RUBY.strip_indent)
puts (map do |x|
^^ Prefer `{...}` over `do...end` for functional blocks.
x
end)
RUBY
end
it 'accepts a multi-line block with do-end if it is the return value ' \
'of its scope' do
expect_no_offenses(<<-RUBY.strip_indent)
block do
map do |x|
x
end
end
RUBY
end
it 'accepts a single line block with {} if used in an if statement' do
expect_no_offenses('return if any? { |x| x }')
end
it 'accepts a single line block with {} if used in a logical or' do
expect_no_offenses('any? { |c| c } || foo')
end
it 'accepts a single line block with {} if used in a logical and' do
expect_no_offenses('any? { |c| c } && foo')
end
it 'accepts a single line block with {} if used in an array' do
expect_no_offenses('[detect { true }, other]')
end
it 'accepts a single line block with {} if used in an irange' do
expect_no_offenses('detect { true }..other')
end
it 'accepts a single line block with {} if used in an erange' do
expect_no_offenses('detect { true }...other')
end
it 'accepts a multi-line functional block with do-end if it is ' \
'a known procedural method' do
expect_no_offenses(<<-RUBY.strip_indent)
foo = bar.tap do |x|
x.age = 3
end
RUBY
end
it 'accepts a multi-line functional block with do-end if it is ' \
'an ignored method' do
expect_no_offenses(<<-RUBY.strip_indent)
foo = lambda do
puts 42
end
RUBY
end
context 'with a procedural one-line block' do
context 'with AllowBracesOnProceduralOneLiners false or unset' do
it 'registers an offense for a single line procedural block' do
expect_offense(<<-RUBY.strip_indent)
each { |x| puts x }
^ Prefer `do...end` over `{...}` for procedural blocks.
RUBY
end
it 'accepts a single line block with do-end if it is procedural' do
expect_no_offenses('each do |x| puts x; end')
end
end
context 'with AllowBracesOnProceduralOneLiners true' do
let(:cop_config) do
cop_config.merge('AllowBracesOnProceduralOneLiners' => true)
end
it 'accepts a single line procedural block with braces' do
expect_no_offenses('each { |x| puts x }')
end
it 'accepts a single line procedural do-end block' do
expect_no_offenses('each do |x| puts x; end')
end
end
end
context 'with a procedural multi-line block' do
let(:corrected_source) do
<<-RUBY.strip_indent
each do |x|
x
end
RUBY
end
it 'auto-corrects { and } to do and end' do
source = <<-RUBY.strip_indent
each { |x|
x
}
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(corrected_source)
end
it 'auto-corrects { and } to do and end with appropriate spacing' do
source = <<-RUBY.strip_indent
each {|x|
x
}
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(corrected_source)
end
end
it 'does not auto-correct {} to do-end if it is a known functional ' \
'method' do
source = <<-RUBY.strip_indent
let(:foo) { |x|
x
}
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(source)
end
it 'does not autocorrect do-end to {} if it is a known procedural ' \
'method' do
source = <<-RUBY.strip_indent
foo = bar.tap do |x|
x.age = 1
end
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(source)
end
it 'auto-corrects do-end to {} if it is a functional block' do
source = <<-RUBY.strip_indent
foo = map do |x|
x
end
RUBY
expected_source = <<-RUBY.strip_indent
foo = map { |x|
x
}
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(expected_source)
end
it 'auto-corrects do-end to {} with appropriate spacing' do
source = <<-RUBY.strip_indent
foo = map do|x|
x
end
RUBY
expected_source = <<-RUBY.strip_indent
foo = map { |x|
x
}
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(expected_source)
end
it 'auto-corrects do-end to {} if it is a functional block and does ' \
'not change the meaning' do
source = <<-RUBY.strip_indent
puts (map do |x|
x
end)
RUBY
expected_source = <<-RUBY.strip_indent
puts (map { |x|
x
})
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(expected_source)
end
end
context 'line count-based style' do
cop_config = {
'EnforcedStyle' => 'line_count_based',
'IgnoredMethods' => %w[proc]
}
let(:cop_config) { cop_config }
include_examples 'syntactic styles'
it 'auto-corrects do and end for single line blocks to { and }' do
new_source = autocorrect_source('block do |x| end')
expect(new_source).to eq('block { |x| }')
end
it 'does not auto-correct do-end if {} would change the meaning' do
src = "s.subspec 'Subspec' do |sp| end"
new_source = autocorrect_source(src)
expect(new_source).to eq(src)
end
it 'does not auto-correct {} if do-end would change the meaning' do
src = <<-RUBY.strip_indent
foo :bar, :baz, qux: lambda { |a|
bar a
}
RUBY
new_source = autocorrect_source(src)
expect(new_source).to eq(src)
end
context 'when there are braces around a multi-line block' do
it 'registers an offense in the simple case' do
expect_offense(<<-RUBY.strip_indent)
each { |x|
^ Avoid using `{...}` for multi-line blocks.
}
RUBY
end
it 'accepts braces if do-end would change the meaning' do
expect_no_offenses(<<-RUBY.strip_indent)
scope :foo, lambda { |f|
where(condition: "value")
}
expect { something }.to raise_error(ErrorClass) { |error|
# ...
}
expect { x }.to change {
Counter.count
}.from(0).to(1)
cr.stubs client: mock {
expects(:email_disabled=).with(true)
expects :save
}
RUBY
end
it 'accepts a multi-line functional block with {} if it is ' \
'an ignored method' do
expect_no_offenses(<<-RUBY.strip_indent)
foo = proc {
puts 42
}
RUBY
end
it 'registers an offense for braces if do-end would not change ' \
'the meaning' do
expect_offense(<<-RUBY.strip_indent)
scope :foo, (lambda { |f|
^ Avoid using `{...}` for multi-line blocks.
where(condition: "value")
})
expect { something }.to(raise_error(ErrorClass) { |error|
^ Avoid using `{...}` for multi-line blocks.
# ...
})
RUBY
end
it 'can handle special method names such as []= and done?' do
expect_offense(<<-RUBY.strip_indent)
h2[k2] = Hash.new { |h3,k3|
^ Avoid using `{...}` for multi-line blocks.
h3[k3] = 0
}
x = done? list.reject { |e|
e.nil?
}
RUBY
end
it 'auto-corrects { and } to do and end' do
source = <<-RUBY.strip_indent
each{ |x|
some_method
other_method
}
RUBY
expected_source = <<-RUBY.strip_indent
each do |x|
some_method
other_method
end
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(expected_source)
end
it 'auto-corrects adjacent curly braces correctly' do
source = <<-RUBY.strip_indent
(0..3).each { |a| a.times {
puts a
}}
RUBY
new_source = autocorrect_source(source)
expect(new_source).to eq(<<-RUBY.strip_indent)
(0..3).each do |a| a.times do
puts a
end end
RUBY
end
it 'does not auto-correct {} if do-end would introduce a syntax error' do
src = <<-RUBY.strip_indent
my_method :arg1, arg2: proc {
something
}, arg3: :another_value
RUBY
new_source = autocorrect_source(src)
expect(new_source).to eq(src)
end
end
end
context 'braces for chaining style' do
cop_config = {
'EnforcedStyle' => 'braces_for_chaining',
'IgnoredMethods' => %w[proc]
}
let(:cop_config) { cop_config }
include_examples 'syntactic styles'
it 'registers an offense for multi-line chained do-end blocks' do
expect_offense(<<-RUBY.strip_indent)
each do |x|
^^ Prefer `{...}` over `do...end` for multi-line chained blocks.
end.map(&:to_s)
RUBY
end
it 'auto-corrects do-end for chained blocks' do
src = <<-RUBY.strip_indent
each do |x|
end.map(&:to_s)
RUBY
new_source = autocorrect_source(src)
expect(new_source).to eq(<<-RUBY.strip_indent)
each { |x|
}.map(&:to_s)
RUBY
end
it 'accepts a multi-line functional block with {} if it is ' \
'an ignored method' do
expect_no_offenses(<<-RUBY.strip_indent)
foo = proc {
puts 42
}
RUBY
end
it 'allows when :[] is chained' do
expect_no_offenses(<<-RUBY.strip_indent)
foo = [{foo: :bar}].find { |h|
h.key?(:foo)
}[:foo]
RUBY
end
it 'allows do/end inside Hash[]' do
expect_no_offenses(<<-RUBY.strip_indent)
Hash[
{foo: :bar}.map do |k, v|
[k, v]
end
]
RUBY
end
it 'allows chaining to } inside of Hash[]' do
expect_no_offenses(<<-RUBY.strip_indent)
Hash[
{foo: :bar}.map { |k, v|
[k, v]
}.uniq
]
RUBY
end
it 'disallows {} with no chain inside of Hash[]' do
expect_offense(<<-RUBY.strip_indent)
Hash[
{foo: :bar}.map { |k, v|
^ Prefer `do...end` for multi-line blocks without chaining.
[k, v]
}
]
RUBY
end
context 'when there are braces around a multi-line block' do
it 'registers an offense in the simple case' do
expect_offense(<<-RUBY.strip_indent)
each { |x|
^ Prefer `do...end` for multi-line blocks without chaining.
}
RUBY
end
it 'allows when the block is being chained' do
expect_no_offenses(<<-RUBY.strip_indent)
each { |x|
}.map(&:to_sym)
RUBY
end
end
end
context 'always braces' do
cop_config = {
'EnforcedStyle' => 'always_braces',
'IgnoredMethods' => %w[proc]
}
let(:cop_config) { cop_config }
it 'registers an offense for a single line block with do-end' do
expect_offense(<<-RUBY.strip_indent)
each do |x| end
^^ Prefer `{...}` over `do...end` for blocks.
RUBY
end
it 'accepts a single line block with braces' do
expect_no_offenses('each { |x| }')
end
it 'registers an offence for a multi-line block with do-end' do
expect_offense(<<-RUBY.strip_indent)
each do |x|
^^ Prefer `{...}` over `do...end` for blocks.
end
RUBY
end
it 'auto-corrects do and end for single line blocks to { and }' do
new_source = autocorrect_source('block do |x| end')
expect(new_source).to eq('block { |x| }')
end
it 'does not auto-correct do-end if {} would change the meaning' do
src = "s.subspec 'Subspec' do |sp| end"
new_source = autocorrect_source(src)
expect(new_source).to eq(src)
end
it 'accepts a multi-line block that needs braces to be valid ruby' do
expect_no_offenses(<<-RUBY.strip_indent)
puts [1, 2, 3].map { |n|
n * n
}, 1
RUBY
end
it 'registers an offense for multi-line chained do-end blocks' do
expect_offense(<<-RUBY.strip_indent)
each do |x|
^^ Prefer `{...}` over `do...end` for blocks.
end.map(&:to_s)
RUBY
end
it 'auto-corrects do-end for chained blocks' do
src = <<-RUBY.strip_indent
each do |x|
end.map(&:to_s)
RUBY
new_source = autocorrect_source(src)
expect(new_source).to eq(<<-RUBY.strip_indent)
each { |x|
}.map(&:to_s)
RUBY
end
it 'accepts a multi-line functional block with do-end if it is ' \
'an ignored method' do
expect_no_offenses(<<-RUBY.strip_indent)
foo = proc do
puts 42
end
RUBY
end
context 'when there are braces around a multi-line block' do
it 'registers an offense in the simple case' do
expect_offense(<<-RUBY.strip_indent)
each do |x|
^^ Prefer `{...}` over `do...end` for blocks.
end
RUBY
end
it 'allows when the block is being chained' do
expect_no_offenses(<<-RUBY.strip_indent)
each { |x|
}.map(&:to_sym)
RUBY
end
end
end
end