File: //usr/local/rvm/src/ruby-2.5.9/spec/ruby/core/proc/arity_spec.rb
require File.expand_path('../../../spec_helper', __FILE__)
describe "Proc#arity" do
SpecEvaluate.desc = "for definition"
context "for instances created with -> () { }" do
context "returns zero" do
evaluate <<-ruby do
@a = -> () {}
ruby
@a.arity.should == 0
end
evaluate <<-ruby do
@a = -> (&b) {}
ruby
@a.arity.should == 0
end
end
context "returns positive values" do
evaluate <<-ruby do
@a = -> (a) { }
@b = -> (a, b) { }
@c = -> (a, b, c) { }
@d = -> (a, b, c, d) { }
ruby
@a.arity.should == 1
@b.arity.should == 2
@c.arity.should == 3
@d.arity.should == 4
end
evaluate <<-ruby do
@a = -> (a:) { }
@b = -> (a:, b:) { }
@c = -> (a: 1, b:, c:, d: 2) { }
ruby
@a.arity.should == 1
@b.arity.should == 1
@c.arity.should == 1
end
evaluate <<-ruby do
@a = -> (a, b:) { }
@b = -> (a, b:, &l) { }
ruby
@a.arity.should == 2
@b.arity.should == 2
end
evaluate <<-ruby do
@a = -> (a, b, c:, d: 1) { }
@b = -> (a, b, c:, d: 1, **k, &l) { }
ruby
@a.arity.should == 3
@b.arity.should == 3
end
evaluate <<-ruby do
@a = -> ((a, (*b, c))) { }
@b = -> (a, (*b, c), d, (*e), (*)) { }
ruby
@a.arity.should == 1
@b.arity.should == 5
end
end
context "returns negative values" do
evaluate <<-ruby do
@a = -> (a=1) { }
@b = -> (a=1, b=2) { }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = -> (a, b=1) { }
@b = -> (a, b, c=1, d=2) { }
ruby
@a.arity.should == -2
@b.arity.should == -3
end
evaluate <<-ruby do
@a = -> (a=1, *b) { }
@b = -> (a=1, b=2, *c) { }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = -> (*) { }
@b = -> (*a) { }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = -> (a, *) { }
@b = -> (a, *b) { }
@c = -> (a, b, *c) { }
@d = -> (a, b, c, *d) { }
ruby
@a.arity.should == -2
@b.arity.should == -2
@c.arity.should == -3
@d.arity.should == -4
end
evaluate <<-ruby do
@a = -> (*a, b) { }
@b = -> (*a, b, c) { }
@c = -> (*a, b, c, d) { }
ruby
@a.arity.should == -2
@b.arity.should == -3
@c.arity.should == -4
end
evaluate <<-ruby do
@a = -> (a, *b, c) { }
@b = -> (a, b, *c, d, e) { }
ruby
@a.arity.should == -3
@b.arity.should == -5
end
evaluate <<-ruby do
@a = -> (a, b=1, c=2, *d, e, f) { }
@b = -> (a, b, c=1, *d, e, f, g) { }
ruby
@a.arity.should == -4
@b.arity.should == -6
end
evaluate <<-ruby do
@a = -> (a: 1) { }
@b = -> (a: 1, b: 2) { }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = -> (a=1, b: 2) { }
@b = -> (*a, b: 1) { }
@c = -> (a=1, b: 2) { }
@d = -> (a=1, *b, c: 2, &l) { }
ruby
@a.arity.should == -1
@b.arity.should == -1
@c.arity.should == -1
@d.arity.should == -1
end
evaluate <<-ruby do
@a = -> (**k, &l) { }
@b= -> (*a, **k) { }
@c = ->(a: 1, b: 2, **k) { }
ruby
@a.arity.should == -1
@b.arity.should == -1
@c.arity.should == -1
end
evaluate <<-ruby do
@a = -> (a=1, *b, c:, d: 2, **k, &l) { }
ruby
@a.arity.should == -2
end
evaluate <<-ruby do
@a = -> (a, b=1, *c, d, e:, f: 2, **k, &l) { }
@b = -> (a, b=1, *c, d:, e:, f: 2, **k, &l) { }
@c = -> (a=0, b=1, *c, d, e:, f: 2, **k, &l) { }
@d = -> (a=0, b=1, *c, d:, e:, f: 2, **k, &l) { }
ruby
@a.arity.should == -4
@b.arity.should == -3
@c.arity.should == -3
@d.arity.should == -2
end
end
end
context "for instances created with lambda { || }" do
context "returns zero" do
evaluate <<-ruby do
@a = lambda { }
@b = lambda { || }
ruby
@a.arity.should == 0
@b.arity.should == 0
end
evaluate <<-ruby do
@a = lambda { |&b| }
ruby
@a.arity.should == 0
end
end
context "returns positive values" do
evaluate <<-ruby do
@a = lambda { |a| }
@b = lambda { |a, b| }
@c = lambda { |a, b, c| }
@d = lambda { |a, b, c, d| }
ruby
@a.arity.should == 1
@b.arity.should == 2
@c.arity.should == 3
@d.arity.should == 4
end
evaluate <<-ruby do
@a = lambda { |a:| }
@b = lambda { |a:, b:| }
@c = lambda { |a: 1, b:, c:, d: 2| }
ruby
@a.arity.should == 1
@b.arity.should == 1
@c.arity.should == 1
end
evaluate <<-ruby do
@a = lambda { |a, b:| }
@b = lambda { |a, b:, &l| }
ruby
@a.arity.should == 2
@b.arity.should == 2
end
evaluate <<-ruby do
@a = lambda { |a, b, c:, d: 1| }
@b = lambda { |a, b, c:, d: 1, **k, &l| }
ruby
@a.arity.should == 3
@b.arity.should == 3
end
end
context "returns negative values" do
evaluate <<-ruby do
@a = lambda { |a=1| }
@b = lambda { |a=1, b=2| }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = lambda { |a, b=1| }
@b = lambda { |a, b, c=1, d=2| }
ruby
@a.arity.should == -2
@b.arity.should == -3
end
evaluate <<-ruby do
@a = lambda { |a=1, *b| }
@b = lambda { |a=1, b=2, *c| }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = lambda { |*| }
@b = lambda { |*a| }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = lambda { |a, *| }
@b = lambda { |a, *b| }
@c = lambda { |a, b, *c| }
@d = lambda { |a, b, c, *d| }
ruby
@a.arity.should == -2
@b.arity.should == -2
@c.arity.should == -3
@d.arity.should == -4
end
evaluate <<-ruby do
@a = lambda { |*a, b| }
@b = lambda { |*a, b, c| }
@c = lambda { |*a, b, c, d| }
ruby
@a.arity.should == -2
@b.arity.should == -3
@c.arity.should == -4
end
evaluate <<-ruby do
@a = lambda { |a, *b, c| }
@b = lambda { |a, b, *c, d, e| }
ruby
@a.arity.should == -3
@b.arity.should == -5
end
evaluate <<-ruby do
@a = lambda { |a, b=1, c=2, *d, e, f| }
@b = lambda { |a, b, c=1, *d, e, f, g| }
ruby
@a.arity.should == -4
@b.arity.should == -6
end
evaluate <<-ruby do
@a = lambda { |a: 1| }
@b = lambda { |a: 1, b: 2| }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = lambda { |a=1, b: 2| }
@b = lambda { |*a, b: 1| }
@c = lambda { |a=1, b: 2| }
@d = lambda { |a=1, *b, c: 2, &l| }
ruby
@a.arity.should == -1
@b.arity.should == -1
@c.arity.should == -1
@d.arity.should == -1
end
evaluate <<-ruby do
@a = lambda { |**k, &l| }
@b = lambda { |*a, **k| }
@c = lambda { |a: 1, b: 2, **k| }
ruby
@a.arity.should == -1
@b.arity.should == -1
@c.arity.should == -1
end
evaluate <<-ruby do
@a = lambda { |a=1, *b, c:, d: 2, **k, &l| }
ruby
@a.arity.should == -2
end
evaluate <<-ruby do
@a = lambda { |(a, (*b, c)), d=1| }
@b = lambda { |a, (*b, c), d, (*e), (*), **k| }
@c = lambda { |a, (b, c), *, d:, e: 2, **| }
ruby
@a.arity.should == -2
@b.arity.should == -6
@c.arity.should == -4
end
evaluate <<-ruby do
@a = lambda { |a, b=1, *c, d, e:, f: 2, **k, &l| }
@b = lambda { |a, b=1, *c, d:, e:, f: 2, **k, &l| }
@c = lambda { |a=0, b=1, *c, d, e:, f: 2, **k, &l| }
@d = lambda { |a=0, b=1, *c, d:, e:, f: 2, **k, &l| }
ruby
@a.arity.should == -4
@b.arity.should == -3
@c.arity.should == -3
@d.arity.should == -2
end
end
end
context "for instances created with proc { || }" do
context "returns zero" do
evaluate <<-ruby do
@a = proc { }
@b = proc { || }
ruby
@a.arity.should == 0
@b.arity.should == 0
end
evaluate <<-ruby do
@a = proc { |&b| }
ruby
@a.arity.should == 0
end
evaluate <<-ruby do
@a = proc { |a=1| }
@b = proc { |a=1, b=2| }
ruby
@a.arity.should == 0
@b.arity.should == 0
end
evaluate <<-ruby do
@a = proc { |a: 1| }
@b = proc { |a: 1, b: 2| }
ruby
@a.arity.should == 0
@b.arity.should == 0
end
evaluate <<-ruby do
@a = proc { |**k, &l| }
@b = proc { |a: 1, b: 2, **k| }
ruby
@a.arity.should == 0
@b.arity.should == 0
end
evaluate <<-ruby do
@a = proc { |a=1, b: 2| }
@b = proc { |a=1, b: 2| }
ruby
@a.arity.should == 0
@b.arity.should == 0
end
end
context "returns positive values" do
evaluate <<-ruby do
@a = proc { |a| }
@b = proc { |a, b| }
@c = proc { |a, b, c| }
@d = proc { |a, b, c, d| }
ruby
@a.arity.should == 1
@b.arity.should == 2
@c.arity.should == 3
@d.arity.should == 4
end
evaluate <<-ruby do
@a = proc { |a, b=1| }
@b = proc { |a, b, c=1, d=2| }
ruby
@a.arity.should == 1
@b.arity.should == 2
end
evaluate <<-ruby do
@a = lambda { |a:| }
@b = lambda { |a:, b:| }
@c = lambda { |a: 1, b:, c:, d: 2| }
ruby
@a.arity.should == 1
@b.arity.should == 1
@c.arity.should == 1
end
evaluate <<-ruby do
@a = proc { |a, b:| }
@b = proc { |a, b:, &l| }
ruby
@a.arity.should == 2
@b.arity.should == 2
end
evaluate <<-ruby do
@a = proc { |a, b, c:, d: 1| }
@b = proc { |a, b, c:, d: 1, **k, &l| }
ruby
@a.arity.should == 3
@b.arity.should == 3
end
evaluate <<-ruby do
@a = proc { |(a, (*b, c)), d=1| }
@b = proc { |a, (*b, c), d, (*e), (*), **k| }
ruby
@a.arity.should == 1
@b.arity.should == 5
end
end
context "returns negative values" do
evaluate <<-ruby do
@a = proc { |a=1, *b| }
@b = proc { |a=1, b=2, *c| }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = proc { |*| }
@b = proc { |*a| }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = proc { |a, *| }
@b = proc { |a, *b| }
@c = proc { |a, b, *c| }
@d = proc { |a, b, c, *d| }
ruby
@a.arity.should == -2
@b.arity.should == -2
@c.arity.should == -3
@d.arity.should == -4
end
evaluate <<-ruby do
@a = proc { |*a, b| }
@b = proc { |*a, b, c| }
@c = proc { |*a, b, c, d| }
ruby
@a.arity.should == -2
@b.arity.should == -3
@c.arity.should == -4
end
evaluate <<-ruby do
@a = proc { |a, *b, c| }
@b = proc { |a, b, *c, d, e| }
ruby
@a.arity.should == -3
@b.arity.should == -5
end
evaluate <<-ruby do
@a = proc { |a, b=1, c=2, *d, e, f| }
@b = proc { |a, b, c=1, *d, e, f, g| }
ruby
@a.arity.should == -4
@b.arity.should == -6
end
evaluate <<-ruby do
@a = proc { |*a, b: 1| }
@b = proc { |a=1, *b, c: 2, &l| }
ruby
@a.arity.should == -1
@b.arity.should == -1
end
evaluate <<-ruby do
@a = proc { |*a, **k| }
ruby
@a.arity.should == -1
end
evaluate <<-ruby do
@a = proc { |a=1, *b, c:, d: 2, **k, &l| }
ruby
@a.arity.should == -2
end
evaluate <<-ruby do
@a = proc { |a, (b, c), *, d:, e: 2, **| }
ruby
@a.arity.should == -4
end
evaluate <<-ruby do
@a = proc { |a, b=1, *c, d, e:, f: 2, **k, &l| }
@b = proc { |a, b=1, *c, d:, e:, f: 2, **k, &l| }
@c = proc { |a=0, b=1, *c, d, e:, f: 2, **k, &l| }
@d = proc { |a=0, b=1, *c, d:, e:, f: 2, **k, &l| }
ruby
@a.arity.should == -4
@b.arity.should == -3
@c.arity.should == -3
@d.arity.should == -2
end
end
end
end