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