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-rw-r--r--spec/ruby/language/proc_spec.rb249
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diff --git a/spec/ruby/language/proc_spec.rb b/spec/ruby/language/proc_spec.rb
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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 ArgumentError 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, b| arguments" do
+ it "assigns [] to the argument when passed no values" do
+ proc { |*a, b| [a, b] }.call.should == [[], nil]
+ end
+ end
+
+ describe "taking |a, *b, c| arguments" do
+ it "assigns [] to the argument when passed no values" do
+ proc { |a, *b, c| [a, b, c] }.call.should == [nil, [], nil]
+ 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
+
+ describe "taking |*a, **kw| arguments" do
+ before :each do
+ @p = proc { |*a, **kw| [a, kw] }
+ end
+
+ it 'does not autosplat keyword arguments' do
+ @p.call([1, {a: 1}]).should == [[[1, {a: 1}]], {}]
+ end
+ end
+
+ describe "taking |required keyword arguments, **kw| arguments" do
+ it "raises ArgumentError for missing required argument" do
+ p = proc { |a:, **kw| [a, kw] }
+ -> { p.call() }.should raise_error(ArgumentError)
+ end
+ end
+end
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