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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerable#drop" do
before :each do
@enum = EnumerableSpecs::Numerous.new(3, 2, 1, :go)
end
it "requires exactly one argument" do
->{ @enum.drop{} }.should raise_error(ArgumentError)
->{ @enum.drop(1, 2){} }.should raise_error(ArgumentError)
end
describe "passed a number n as an argument" do
it "raises ArgumentError if n < 0" do
->{ @enum.drop(-1) }.should raise_error(ArgumentError)
end
it "tries to convert n to an Integer using #to_int" do
@enum.drop(2.3).should == [1, :go]
obj = mock('to_int')
obj.should_receive(:to_int).and_return(2)
@enum.drop(obj).should == [1, :go]
end
it "returns [] for empty enumerables" do
EnumerableSpecs::Empty.new.drop(0).should == []
EnumerableSpecs::Empty.new.drop(2).should == []
end
it "returns [] if dropping all" do
@enum.drop(5).should == []
EnumerableSpecs::Numerous.new(3, 2, 1, :go).drop(4).should == []
end
it "raises a TypeError when the passed n cannot be coerced to Integer" do
->{ @enum.drop("hat") }.should raise_error(TypeError)
->{ @enum.drop(nil) }.should raise_error(TypeError)
end
end
end
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