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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Array#drop" do
it "removes the specified number of elements from the start of the array" do
[1, 2, 3, 4, 5].drop(2).should == [3, 4, 5]
end
it "raises an ArgumentError if the number of elements specified is negative" do
-> { [1, 2].drop(-3) }.should raise_error(ArgumentError)
end
it "returns an empty Array if all elements are dropped" do
[1, 2].drop(2).should == []
end
it "returns an empty Array when called on an empty Array" do
[].drop(0).should == []
end
it "does not remove any elements when passed zero" do
[1, 2].drop(0).should == [1, 2]
end
it "returns an empty Array if more elements than exist are dropped" do
[1, 2].drop(3).should == []
end
it 'acts correctly after a shift' do
ary = [nil, 1, 2]
ary.shift
ary.drop(1).should == [2]
end
it "tries to convert the passed argument to an Integer using #to_int" do
obj = mock("to_int")
obj.should_receive(:to_int).and_return(2)
[1, 2, 3].drop(obj).should == [3]
end
it "raises a TypeError when the passed argument can't be coerced to Integer" do
-> { [1, 2].drop("cat") }.should raise_error(TypeError)
end
it "raises a TypeError when the passed argument isn't an integer and #to_int returns non-Integer" do
obj = mock("to_int")
obj.should_receive(:to_int).and_return("cat")
-> { [1, 2].drop(obj) }.should raise_error(TypeError)
end
it 'returns a Array instance for Array subclasses' do
ArraySpecs::MyArray[1, 2, 3, 4, 5].drop(1).should be_an_instance_of(Array)
end
end
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