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require File.expand_path('../../../spec_helper', __FILE__)
require 'set'
describe "Set#proper_subset?" do
before(:each) do
@set = Set[1, 2, 3, 4]
end
it "returns true if passed a Set that self is a proper subset of" do
Set[].proper_subset?(@set).should be_true
Set[].proper_subset?(Set[1, 2, 3]).should be_true
Set[].proper_subset?(Set["a", :b, ?c]).should be_true
Set[1, 2, 3].proper_subset?(@set).should be_true
Set[1, 3].proper_subset?(@set).should be_true
Set[1, 2].proper_subset?(@set).should be_true
Set[1].proper_subset?(@set).should be_true
Set[5].proper_subset?(@set).should be_false
Set[1, 5].proper_subset?(@set).should be_false
Set[nil].proper_subset?(@set).should be_false
Set["test"].proper_subset?(@set).should be_false
@set.proper_subset?(@set).should be_false
Set[].proper_subset?(Set[]).should be_false
end
it "raises an ArgumentError when passed a non-Set" do
lambda { Set[].proper_subset?([]) }.should raise_error(ArgumentError)
lambda { Set[].proper_subset?(1) }.should raise_error(ArgumentError)
lambda { Set[].proper_subset?("test") }.should raise_error(ArgumentError)
lambda { Set[].proper_subset?(Object.new) }.should raise_error(ArgumentError)
end
end
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