shard-ameba/spec/ameba/rule/lint/unused_argument_spec.cr

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require "../../../spec_helper"
module Ameba::Rule::Lint
subject = UnusedArgument.new
subject.ignore_defs = false
describe UnusedArgument do
it "doesn't report if arguments are used" do
s = Source.new %(
def method(a, b, c)
a + b + c
end
3.times do |i|
i + 1
end
->(i : Int32) { i + 1 }
)
subject.catch(s).should be_valid
end
it "reports if method argument is unused" do
s = Source.new %(
def method(a, b, c)
a + b
end
)
subject.catch(s).should_not be_valid
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s.issues.first.message.should eq "Unused argument `c`. If it's necessary, use `_c` " \
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"as an argument name to indicate that it won't be used."
end
it "reports if block argument is unused" do
s = Source.new %(
[1,2].each_with_index do |a, i|
a
end
)
subject.catch(s).should_not be_valid
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s.issues.first.message.should eq "Unused argument `i`. If it's necessary, use `_` " \
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"as an argument name to indicate that it won't be used."
end
it "reports if proc argument is unused" do
s = Source.new %(
-> (a : Int32, b : String) do
a = a + 1
end
)
subject.catch(s).should_not be_valid
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s.issues.first.message.should eq "Unused argument `b`. If it's necessary, use `_b` " \
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"as an argument name to indicate that it won't be used."
end
it "reports multiple unused args" do
s = Source.new %(
def method(a, b, c)
nil
end
)
subject.catch(s).should_not be_valid
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s.issues[0].message.should eq "Unused argument `a`. If it's necessary, use `_a` " \
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"as an argument name to indicate that it won't be used."
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s.issues[1].message.should eq "Unused argument `b`. If it's necessary, use `_b` " \
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"as an argument name to indicate that it won't be used."
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s.issues[2].message.should eq "Unused argument `c`. If it's necessary, use `_c` " \
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"as an argument name to indicate that it won't be used."
end
it "doesn't report if it is an instance var argument" do
s = Source.new %(
class A
def method(@name)
end
end
)
subject.catch(s).should be_valid
end
it "doesn't report if a typed argument is used" do
s = Source.new %(
def method(x : Int32)
3.times do
puts x
end
end
)
subject.catch(s).should be_valid
end
it "doesn't report if an argument with default value is used" do
s = Source.new %(
def method(x = 1)
puts x
end
)
subject.catch(s).should be_valid
end
it "doesn't report if argument starts with a _" do
s = Source.new %(
def method(_x)
end
)
subject.catch(s).should be_valid
end
it "doesn't report if it is a block and used" do
s = Source.new %(
def method(&block)
block.call
end
)
subject.catch(s).should be_valid
end
it "reports if block arg is not used" do
s = Source.new %(
def method(&block)
end
)
subject.catch(s).should_not be_valid
end
it "reports if unused and there is yield" do
s = Source.new %(
def method(&block)
yield 1
end
)
subject.catch(s).should_not be_valid
end
it "doesn't report if variable is referenced implicitly" do
s = Source.new %(
class Bar < Foo
def method(a, b)
super
end
end
)
subject.catch(s).should be_valid
end
it "doesn't report if arg if referenced in case" do
s = Source.new %(
def foo(a)
case a
when /foo/
end
end
)
subject.catch(s).should be_valid
end
context "super" do
it "reports if variable is not referenced implicitly by super" do
s = Source.new %(
class Bar < Foo
def method(a, b)
super a
end
end
)
subject.catch(s).should_not be_valid
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s.issues.first.message.should eq "Unused argument `b`. If it's necessary, use `_b` " \
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"as an argument name to indicate that it won't be used."
end
it "reports rule, location and message" do
s = Source.new %(
def method(a)
end
), "source.cr"
subject.catch(s).should_not be_valid
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issue = s.issues.first
issue.rule.should_not be_nil
issue.message.should eq "Unused argument `a`. If it's necessary, use `_a` " \
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"as an argument name to indicate that it won't be used."
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issue.location.to_s.should eq "source.cr:1:12"
end
end
context "macro" do
it "doesn't report if it is a used macro argument" do
s = Source.new %(
macro my_macro(arg)
{% arg %}
end
)
subject.catch(s).should be_valid
end
it "doesn't report if it is a used macro block argument" do
s = Source.new %(
macro my_macro(&block)
{% block %}
end
)
subject.catch(s).should be_valid
end
it "doesn't report used macro args with equal names in record" do
s = Source.new %(
record X do
macro foo(a, b)
{{a}} + {{b}}
end
macro bar(a, b, c)
{{a}} + {{b}} + {{c}}
end
end
)
subject.catch(s).should be_valid
end
end
context "properties" do
describe "#ignore_defs" do
it "lets the rule to ignore def scopes if true" do
subject.ignore_defs = true
s = Source.new %(
def method(a)
end
)
subject.catch(s).should be_valid
end
it "lets the rule not to ignore def scopes if false" do
subject.ignore_defs = false
s = Source.new %(
def method(a)
end
)
subject.catch(s).should_not be_valid
end
end
context "#ignore_blocks" do
it "lets the rule to ignore block scopes if true" do
subject.ignore_blocks = true
s = Source.new %(
3.times { |i| puts "yo!" }
)
subject.catch(s).should be_valid
end
it "lets the rule not to ignore block scopes if false" do
subject.ignore_blocks = false
s = Source.new %(
3.times { |i| puts "yo!" }
)
subject.catch(s).should_not be_valid
end
end
context "#ignore_procs" do
it "lets the rule to ignore proc scopes if true" do
subject.ignore_procs = true
s = Source.new %(
->(a : Int32) {}
)
subject.catch(s).should be_valid
end
it "lets the rule not to ignore proc scopes if false" do
subject.ignore_procs = false
s = Source.new %(
->(a : Int32) {}
)
subject.catch(s).should_not be_valid
end
end
end
end
end