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require File.expand_path('../../spec_helper', __FILE__)
require File.expand_path('../fixtures/return', __FILE__)
describe "The return keyword" do
it "returns any object directly" do
def r; return 1; end
r().should == 1
end
it "returns an single element array directly" do
def r; return [1]; end
r().should == [1]
end
it "returns an multi element array directly" do
def r; return [1,2]; end
r().should == [1,2]
end
it "returns nil by default" do
def r; return; end
r().should be_nil
end
describe "in a Thread" do
ruby_version_is "" ... "1.9" do
it "raises a ThreadError if used to exit a thread" do
lambda { Thread.new { return }.join }.should raise_error(ThreadError)
end
end
ruby_version_is "1.9" do
it "raises a LocalJumpError if used to exit a thread" do
lambda { Thread.new { return }.join }.should raise_error(LocalJumpError)
end
end
end
describe "when passed a splat" do
ruby_version_is "" ... "1.9" do
it "returns nil when the ary is empty" do
def r; ary = []; return *ary; end
r.should be_nil
end
end
ruby_version_is "1.9" do
it "returns [] when the ary is empty" do
def r; ary = []; return *ary; end
r.should == []
end
end
ruby_version_is "" ... "1.9" do
it "returns the first element when the array is size of 1" do
def r; ary = [1]; return *ary; end
r.should == 1
end
end
ruby_version_is "1.9" do
it "returns the array when the array is size of 1" do
def r; ary = [1]; return *ary; end
r.should == [1]
end
end
it "returns the whole array when size is greater than 1" do
def r; ary = [1,2]; return *ary; end
r.should == [1,2]
def r; ary = [1,2,3]; return *ary; end
r.should == [1,2,3]
end
ruby_version_is "" ... "1.9" do
it "returns a non-array when used as a splat" do
def r; value = 1; return *value; end
r.should == 1
end
end
ruby_version_is "1.9" do
it "returns an array when used as a splat" do
def r; value = 1; return *value; end
r.should == [1]
end
end
it "calls 'to_a' on the splatted value first" do
def r
obj = Object.new
def obj.to_a
[1,2]
end
return *obj
end
r().should == [1,2]
end
ruby_version_is "" ... "1.9" do
it "calls 'to_ary' on the splatted value first" do
def r
obj = Object.new
def obj.to_ary
[1,2]
end
return *obj
end
r().should == [1,2]
end
end
end
describe "within a begin" do
before :each do
ScratchPad.record []
end
it "executes ensure before returning" do
def f()
begin
ScratchPad << :begin
return :begin
ScratchPad << :after_begin
ensure
ScratchPad << :ensure
end
ScratchPad << :function
end
f().should == :begin
ScratchPad.recorded.should == [:begin, :ensure]
end
it "returns last value returned in ensure" do
def f()
begin
ScratchPad << :begin
return :begin
ScratchPad << :after_begin
ensure
ScratchPad << :ensure
return :ensure
ScratchPad << :after_ensure
end
ScratchPad << :function
end
f().should == :ensure
ScratchPad.recorded.should == [:begin, :ensure]
end
it "executes nested ensures before returning" do
def f()
begin
begin
ScratchPad << :inner_begin
return :inner_begin
ScratchPad << :after_inner_begin
ensure
ScratchPad << :inner_ensure
end
ScratchPad << :outer_begin
return :outer_begin
ScratchPad << :after_outer_begin
ensure
ScratchPad << :outer_ensure
end
ScratchPad << :function
end
f().should == :inner_begin
ScratchPad.recorded.should == [:inner_begin, :inner_ensure, :outer_ensure]
end
it "returns last value returned in nested ensures" do
def f()
begin
begin
ScratchPad << :inner_begin
return :inner_begin
ScratchPad << :after_inner_begin
ensure
ScratchPad << :inner_ensure
return :inner_ensure
ScratchPad << :after_inner_ensure
end
ScratchPad << :outer_begin
return :outer_begin
ScratchPad << :after_outer_begin
ensure
ScratchPad << :outer_ensure
return :outer_ensure
ScratchPad << :after_outer_ensure
end
ScratchPad << :function
end
f().should == :outer_ensure
ScratchPad.recorded.should == [:inner_begin, :inner_ensure, :outer_ensure]
end
it "executes the ensure clause when begin/ensure are inside a lambda" do
lambda do
begin
return
ensure
ScratchPad.recorded << :ensure
end
end.call
ScratchPad.recorded.should == [:ensure]
end
end
describe "within a block" do
before :each do
ScratchPad.clear
end
ruby_version_is "" ... "1.9" do
it "raises a LocalJumpError if there is no lexicaly enclosing method" do
def f; yield; end
lambda { f { return 5 } }.should raise_error(LocalJumpError)
end
end
it "causes lambda to return nil if invoked without any arguments" do
lambda { return; 456 }.call.should be_nil
end
it "causes lambda to return nil if invoked with an empty expression" do
lambda { return (); 456 }.call.should be_nil
end
it "causes lambda to return the value passed to return" do
lambda { return 123; 456 }.call.should == 123
end
it "causes the method that lexically encloses the block to return" do
ReturnSpecs::Blocks.new.enclosing_method.should == :return_value
ScratchPad.recorded.should == :before_return
end
it "returns from the lexically enclosing method even in case of chained calls" do
ReturnSpecs::NestedCalls.new.enclosing_method.should == :return_value
ScratchPad.recorded.should == :before_return
end
it "returns from the lexically enclosing method even in case of chained calls(in yield)" do
ReturnSpecs::NestedBlocks.new.enclosing_method.should == :return_value
ScratchPad.recorded.should == :before_return
end
it "causes the method to return even when the immediate parent has already returned" do
ReturnSpecs::SavedInnerBlock.new.start.should == :return_value
ScratchPad.recorded.should == :before_return
end
end
describe "within two blocks" do
it "causes the method that lexically encloses the block to return" do
def f
1.times { 1.times {return true}; false}; false
end
f.should be_true
end
end
describe "within define_method" do
it "goes through the method via a closure" do
ReturnSpecs::ThroughDefineMethod.new.outer.should == :good
end
it "stops at the method when the return is used directly" do
ReturnSpecs::DefineMethod.new.outer.should == :good
end
end
end
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