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Diffstat (limited to 'spec/rubyspec/core/kernel/extend_spec.rb')
-rw-r--r-- | spec/rubyspec/core/kernel/extend_spec.rb | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/spec/rubyspec/core/kernel/extend_spec.rb b/spec/rubyspec/core/kernel/extend_spec.rb new file mode 100644 index 0000000000..482eef32e9 --- /dev/null +++ b/spec/rubyspec/core/kernel/extend_spec.rb @@ -0,0 +1,79 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +module KernelSpecs::M + def self.extend_object(o) + ScratchPad << "extend_object" + super + end + + def self.extended(o) + ScratchPad << "extended" + super + end + + def self.append_features(o) + ScratchPad << "append_features" + super + end +end + +describe "Kernel#extend" do + before :each do + ScratchPad.record [] + end + + it "requires multiple arguments" do + Object.new.method(:extend).arity.should < 0 + end + + it "calls extend_object on argument" do + o = mock('o') + o.extend KernelSpecs::M + ScratchPad.recorded.include?("extend_object").should == true + end + + it "does not calls append_features on arguments metaclass" do + o = mock('o') + o.extend KernelSpecs::M + ScratchPad.recorded.include?("append_features").should == false + end + + it "calls extended on argument" do + o = mock('o') + o.extend KernelSpecs::M + ScratchPad.recorded.include?("extended").should == true + end + + it "makes the class a kind_of? the argument" do + class C + extend KernelSpecs::M + end + (C.kind_of? KernelSpecs::M).should == true + end + + it "raises an ArgumentError when no arguments given" do + lambda { Object.new.extend }.should raise_error(ArgumentError) + end + + it "raises a TypeError when the argument is not a Module" do + o = mock('o') + klass = Class.new + lambda { o.extend(klass) }.should raise_error(TypeError) + end + + describe "on frozen instance" do + before :each do + @frozen = Object.new.freeze + @module = KernelSpecs::M + end + + it "raises an ArgumentError when no arguments given" do + lambda { @frozen.extend }.should raise_error(ArgumentError) + end + + it "raises a RuntimeError" do + lambda { @frozen.extend @module }.should raise_error(RuntimeError) + end + end +end |