require_relative '../spec_helper' require_relative 'fixtures/yield' # Note that these specs use blocks defined as { |*a| ... } to capture the # arguments with which the block is invoked. This is slightly confusing # because the outer Array is a consequence of |*a| but it is necessary to # clearly distinguish some behaviors. describe "The yield call" do before :each do @y = YieldSpecs::Yielder.new end describe "taking no arguments" do it "raises a LocalJumpError when the method is not passed a block" do lambda { @y.z }.should raise_error(LocalJumpError) end it "ignores assignment to the explicit block argument and calls the passed block" do @y.ze { 42 }.should == 42 end end describe "taking a single argument" do describe "when no block is given" do it "raises a LocalJumpError" do lambda { @y.s(1) }.should raise_error(LocalJumpError) end end describe "yielding to a literal block" do it "passes an empty Array when the argument is an empty Array" do @y.s([]) { |*a| a }.should == [[]] end it "passes nil as a value" do @y.s(nil) { |*a| a }.should == [nil] end it "passes a single value" do @y.s(1) { |*a| a }.should == [1] end it "passes a single, multi-value Array" do @y.s([1, 2, 3]) { |*a| a }.should == [[1, 2, 3]] end end describe "yielding to a lambda" do it "passes an empty Array when the argument is an empty Array" do @y.s([], &lambda { |*a| a }).should == [[]] end it "passes nil as a value" do @y.s(nil, &lambda { |*a| a }).should == [nil] end it "passes a single value" do @y.s(1, &lambda { |*a| a }).should == [1] end it "passes a single, multi-value Array" do @y.s([1, 2, 3], &lambda { |*a| a }).should == [[1, 2, 3]] end it "raises an ArgumentError if too few arguments are passed" do lambda { @y.s(1, &lambda { |a,b| [a,b] }) }.should raise_error(ArgumentError) end ruby_bug "#12705", ""..."2.5" do it "should not destructure an Array into multiple arguments" do lambda { @y.s([1, 2], &lambda { |a,b| [a,b] }) }.should raise_error(ArgumentError) end end end end describe "taking multiple arguments" do it "raises a LocalJumpError when the method is not passed a block" do lambda { @y.m(1, 2, 3) }.should raise_error(LocalJumpError) end it "passes the arguments to the block" do @y.m(1, 2, 3) { |*a| a }.should == [1, 2, 3] end it "passes only the first argument if the block takes one parameter" do @y.m(1, 2, 3) { |a| a }.should == 1 end it "raises an ArgumentError if too many arguments are passed to a lambda" do lambda { @y.m(1, 2, 3, &lambda { |a| }) }.should raise_error(ArgumentError) end it "raises an ArgumentError if too few arguments are passed to a lambda" do lambda { @y.m(1, 2, 3, &lambda { |a,b,c,d| }) }.should raise_error(ArgumentError) end end describe "taking a single splatted argument" do it "raises a LocalJumpError when the method is not passed a block" do lambda { @y.r(0) }.should raise_error(LocalJumpError) end it "passes a single value" do @y.r(1) { |*a| a }.should == [1] end it "passes no arguments when the argument is an empty Array" do @y.r([]) { |*a| a }.should == [] end it "passes the value when the argument is an Array containing a single value" do @y.r([1]) { |*a| a }.should == [1] end it "passes the values of the Array as individual arguments" do @y.r([1, 2, 3]) { |*a| a }.should == [1, 2, 3] end it "passes the element of a single element Array" do @y.r([[1, 2]]) { |*a| a }.should == [[1, 2]] @y.r([nil]) { |*a| a }.should == [nil] @y.r([[]]) { |*a| a }.should == [[]] end it "passes no values when give nil as an argument" do @y.r(nil) { |*a| a }.should == [] end end describe "taking multiple arguments with a splat" do it "raises a LocalJumpError when the method is not passed a block" do lambda { @y.rs(1, 2, [3, 4]) }.should raise_error(LocalJumpError) end it "passes the arguments to the block" do @y.rs(1, 2, 3) { |*a| a }.should == [1, 2, 3] end it "does not pass an argument value if the splatted argument is an empty Array" do @y.rs(1, 2, []) { |*a| a }.should == [1, 2] end it "passes the Array elements as arguments if the splatted argument is a non-empty Array" do @y.rs(1, 2, [3]) { |*a| a }.should == [1, 2, 3] @y.rs(1, 2, [nil]) { |*a| a }.should == [1, 2, nil] @y.rs(1, 2, [[]]) { |*a| a }.should == [1, 2, []] @y.rs(1, 2, [3, 4, 5]) { |*a| a }.should == [1, 2, 3, 4, 5] end it "does not pass an argument value if the splatted argument is nil" do @y.rs(1, 2, nil) { |*a| a }.should == [1, 2] end end describe "taking matching arguments with splats and post args" do it "raises a LocalJumpError when the method is not passed a block" do lambda { @y.rs(1, 2, [3, 4]) }.should raise_error(LocalJumpError) end it "passes the arguments to the block" do @y.rs([1, 2], 3, 4) { |(*a, b), c, d| [a, b, c, d] }.should == [[1], 2, 3, 4] end end it "uses captured block of a block used in define_method" do @y.deep(2).should == 4 end end