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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
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