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require_relative '../spec_helper'
describe "A Proc" do
it "captures locals from the surrounding scope" do
var = 1
lambda { var }.call.should == 1
end
it "does not capture a local when an argument has the same name" do
var = 1
lambda { |var| var }.call(2).should == 2
var.should == 1
end
describe "taking zero arguments" do
before :each do
@l = lambda { 1 }
end
it "does not raise an exception if no values are passed" do
@l.call.should == 1
end
it "raises an ArgumentErro if a value is passed" do
lambda { @l.call(0) }.should raise_error(ArgumentError)
end
end
describe "taking || arguments" do
before :each do
@l = lambda { || 1 }
end
it "does not raise an exception when passed no values" do
@l.call.should == 1
end
it "raises an ArgumentError if a value is passed" do
lambda { @l.call(0) }.should raise_error(ArgumentError)
end
end
describe "taking |a| arguments" do
before :each do
@l = lambda { |a| a }
end
it "assigns the value passed to the argument" do
@l.call(2).should == 2
end
it "does not destructure a single Array value" do
@l.call([1, 2]).should == [1, 2]
end
it "does not call #to_ary to convert a single passed object to an Array" do
obj = mock("block yield to_ary")
obj.should_not_receive(:to_ary)
@l.call(obj).should equal(obj)
end
it "raises an ArgumentError if no value is passed" do
lambda { @l.call }.should raise_error(ArgumentError)
end
end
describe "taking |a, b| arguments" do
before :each do
@l = lambda { |a, b| [a, b] }
end
it "raises an ArgumentError if passed no values" do
lambda { @l.call }.should raise_error(ArgumentError)
end
it "raises an ArgumentError if passed one value" do
lambda { @l.call(0) }.should raise_error(ArgumentError)
end
it "assigns the values passed to the arguments" do
@l.call(1, 2).should == [1, 2]
end
it "does not call #to_ary to convert a single passed object to an Array" do
obj = mock("proc call to_ary")
obj.should_not_receive(:to_ary)
lambda { @l.call(obj) }.should raise_error(ArgumentError)
end
end
describe "taking |a, *b| arguments" do
before :each do
@l = lambda { |a, *b| [a, b] }
end
it "raises an ArgumentError if passed no values" do
lambda { @l.call }.should raise_error(ArgumentError)
end
it "does not destructure a single Array value yielded" do
@l.call([1, 2, 3]).should == [[1, 2, 3], []]
end
it "assigns all passed values after the first to the rest argument" do
@l.call(1, 2, 3).should == [1, [2, 3]]
end
it "does not call #to_ary to convert a single passed object to an Array" do
obj = mock("block yield to_ary")
obj.should_not_receive(:to_ary)
@l.call(obj).should == [obj, []]
end
end
describe "taking |*| arguments" do
before :each do
@l = lambda { |*| 1 }
end
it "does not raise an exception when passed no values" do
@l.call.should == 1
end
it "does not raise an exception when passed multiple values" do
@l.call(2, 3, 4).should == 1
end
it "does not call #to_ary to convert a single passed object to an Array" do
obj = mock("block yield to_ary")
obj.should_not_receive(:to_ary)
@l.call(obj).should == 1
end
end
describe "taking |*a| arguments" do
before :each do
@l = lambda { |*a| a }
end
it "assigns [] to the argument when passed no values" do
@l.call.should == []
end
it "assigns the argument an Array wrapping one passed value" do
@l.call(1).should == [1]
end
it "assigns the argument an Array wrapping all values passed" do
@l.call(1, 2, 3).should == [1, 2, 3]
end
it "does not call #to_ary to convert a single passed object to an Array" do
obj = mock("block yield to_ary")
obj.should_not_receive(:to_ary)
@l.call(obj).should == [obj]
end
end
describe "taking |a, | arguments" do
before :each do
@l = lambda { |a, | a }
end
it "raises an ArgumentError when passed no values" do
lambda { @l.call }.should raise_error(ArgumentError)
end
it "raises an ArgumentError when passed more than one value" do
lambda { @l.call(1, 2) }.should raise_error(ArgumentError)
end
it "assigns the argument the value passed" do
@l.call(1).should == 1
end
it "does not destructure when passed a single Array" do
@l.call([1,2]).should == [1, 2]
end
it "does not call #to_ary to convert a single passed object to an Array" do
obj = mock("block yield to_ary")
obj.should_not_receive(:to_ary)
@l.call(obj).should == obj
end
end
describe "taking |(a, b)| arguments" do
before :each do
@l = lambda { |(a, b)| [a, b] }
end
it "raises an ArgumentError when passed no values" do
lambda { @l.call }.should raise_error(ArgumentError)
end
it "destructures a single Array value yielded" do
@l.call([1, 2]).should == [1, 2]
end
it "calls #to_ary to convert a single passed object to an Array" do
obj = mock("block yield to_ary")
obj.should_receive(:to_ary).and_return([1, 2])
@l.call(obj).should == [1, 2]
end
it "raises a TypeError if #to_ary does not return an Array" do
obj = mock("block yield to_ary invalid")
obj.should_receive(:to_ary).and_return(1)
lambda { @l.call(obj) }.should raise_error(TypeError)
end
end
end
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