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Specs for Range#last with argument.

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1 parent 807f36c commit 6acb70a4e1df8a9f5315439d9fcc6abb1e41c521 @brixen brixen committed Mar 23, 2013
Showing with 45 additions and 0 deletions.
  1. +45 −0 spec/ruby/core/range/last_spec.rb
@@ -3,4 +3,49 @@
describe "Range#last" do
it_behaves_like(:range_end, :last)
+
+ ruby_version_is "1.9" do
+ it "returns the specified number of elements from the end" do
+ (1..5).last(3).should == [3, 4, 5]
+ end
+
+ it "returns an empty array for an empty Range" do
+ (0...0).last(2).should == []
+ end
+
+ it "returns an empty array when passed zero" do
+ (0..2).last(0).should == []
+ end
+
+ it "returns all elements in the range when count exceeds the number of elements" do
+ (2..4).last(5).should == [2, 3, 4]
+ end
+
+ it "raises an ArgumentError when count is negative" do
+ lambda { (0..2).last(-1) }.should raise_error(ArgumentError)
+ end
+
+ it "calls #to_int to convert the argument" do
+ obj = mock_int(2)
+ (3..7).last(obj).should == [6, 7]
+ 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")
+ lambda { (2..3).last(obj) }.should raise_error(TypeError)
+ end
+
+ it "truncates the value when passed a Float" do
+ (2..9).last(2.8).should == [8, 9]
+ end
+
+ it "raises a TypeError when passed nil" do
+ lambda { (2..3).last(nil) }.should raise_error(TypeError)
+ end
+
+ it "raises a TypeError when passed a String" do
+ lambda { (2..3).last("1") }.should raise_error(TypeError)
+ end
+ end
end

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