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require File.expand_path('../../../spec_helper', __FILE__)
require File.expand_path('../fixtures/classes', __FILE__)
require File.expand_path('../shared/lambda', __FILE__)
# The functionality of lambdas is specified in core/proc
describe "Kernel.lambda" do
it_behaves_like(:kernel_lambda, :lambda)
it "is a private method" do
Kernel.should have_private_instance_method(:lambda)
end
it "creates a lambda-style Proc if given a literal block" do
l = lambda { 42 }
l.lambda?.should be_true
end
it "returned the passed Proc if given an existing Proc" do
some_proc = proc {}
l = lambda(&some_proc)
l.should equal(some_proc)
l.lambda?.should be_false
end
it "checks the arity of the call when no args are specified" do
l = lambda { :called }
l.call.should == :called
lambda { l.call(1) }.should raise_error(ArgumentError)
lambda { l.call(1, 2) }.should raise_error(ArgumentError)
end
it "checks the arity when 1 arg is specified" do
l = lambda { |a| :called }
l.call(1).should == :called
lambda { l.call }.should raise_error(ArgumentError)
lambda { l.call(1, 2) }.should raise_error(ArgumentError)
end
it "does not check the arity when passing a Proc with &" do
l = lambda { || :called }
p = proc { || :called }
lambda { l.call(1) }.should raise_error(ArgumentError)
p.call(1).should == :called
end
it "accepts 0 arguments when used with ||" do
lambda {
lambda { || }.call(1)
}.should raise_error(ArgumentError)
end
it "strictly checks the arity when 0 or 2..inf args are specified" do
l = lambda { |a,b| }
lambda {
l.call
}.should raise_error(ArgumentError)
lambda {
l.call(1)
}.should raise_error(ArgumentError)
lambda {
l.call(1,2)
}.should_not raise_error(ArgumentError)
end
it "returns from the lambda itself, not the creation site of the lambda" do
@reached_end_of_method = nil
def test
send(:lambda) { return }.call
@reached_end_of_method = true
end
test
@reached_end_of_method.should be_true
end
it "allows long returns to flow through it" do
KernelSpecs::Lambda.new.outer.should == :good
end
end
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