shard-ameba/spec/ameba/rule/lint/empty_expression_spec.cr
2018-11-24 19:38:13 +02:00

111 lines
2.1 KiB
Crystal

require "../../../spec_helper"
module Ameba
subject = Rule::Lint::EmptyExpression.new
def it_detects_empty_expression(code)
it "detects empty expression" do
s = Source.new code
rule = Rule::Lint::EmptyExpression.new
rule.catch(s).should_not be_valid
end
end
describe Rule::Lint::EmptyExpression do
it "passes if there is no empty expression" do
s = Source.new %(
def method()
end
method()
method(1, 2, 3)
method(nil)
a = nil
a = ""
a = 0
nil
:any.nil?
begin "" end
[nil] << nil
)
subject.catch(s).should be_valid
end
it_detects_empty_expression %(())
it_detects_empty_expression %(((())))
it_detects_empty_expression %(a = ())
it_detects_empty_expression %((();()))
it_detects_empty_expression %(if (); end)
it_detects_empty_expression %(
if foo
1
elsif ()
2
end
)
it_detects_empty_expression %(
case foo
when :foo then ()
end
)
it_detects_empty_expression %(
case foo
when :foo then 1
else
()
end
)
it_detects_empty_expression %(
case foo
when () then 1
end
)
it_detects_empty_expression %(
def method
a = 1
()
end
)
it_detects_empty_expression %(
def method
rescue
()
end
)
it_detects_empty_expression %(
def method
begin
end
end
)
it_detects_empty_expression %(
begin; end
)
it_detects_empty_expression %(
begin
nil
end
)
it_detects_empty_expression %(
begin
()
end
)
it "reports rule, location and message" do
s = Source.new %(
if ()
end
), "source.cr"
subject.catch(s).should_not be_valid
issue = s.issues.first
issue.rule.should_not be_nil
issue.location.to_s.should eq "source.cr:1:4"
issue.end_location.to_s.should eq "source.cr:1:5"
issue.message.should eq "Avoid empty expressions"
end
end
end