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Diffstat (limited to 'spec/rubyspec/language/proc_spec.rb')
-rw-r--r-- | spec/rubyspec/language/proc_spec.rb | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/spec/rubyspec/language/proc_spec.rb b/spec/rubyspec/language/proc_spec.rb new file mode 100644 index 0000000000..bbef318826 --- /dev/null +++ b/spec/rubyspec/language/proc_spec.rb @@ -0,0 +1,220 @@ +require File.expand_path('../../spec_helper', __FILE__) + +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 ArgumentErro 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, | 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 +end |