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require_relative '../../spec_helper'
require_relative 'shared/begin'
describe "Range#first" do
it_behaves_like :range_begin, :first
it "returns the specified number of elements from the beginning" do
(0..2).first(2).should == [0, 1]
end
it "returns an empty array for an empty Range" do
(0...0).first(2).should == []
end
it "returns an empty array when passed zero" do
(0..2).first(0).should == []
end
it "returns all elements in the range when count exceeds the number of elements" do
(0..2).first(4).should == [0, 1, 2]
end
it "raises an ArgumentError when count is negative" do
-> { (0..2).first(-1) }.should raise_error(ArgumentError)
end
it "calls #to_int to convert the argument" do
obj = mock_int(2)
(3..7).first(obj).should == [3, 4]
end
it "raises a TypeError if #to_int does not return an Integer" do
obj = mock("to_int")
obj.should_receive(:to_int).and_return("1")
-> { (2..3).first(obj) }.should raise_error(TypeError)
end
it "truncates the value when passed a Float" do
(2..9).first(2.8).should == [2, 3]
end
it "raises a TypeError when passed nil" do
-> { (2..3).first(nil) }.should raise_error(TypeError)
end
it "raises a TypeError when passed a String" do
-> { (2..3).first("1") }.should raise_error(TypeError)
end
it "raises a RangeError when called on an beginless range" do
-> { (..1).first }.should raise_error(RangeError)
end
end
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