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Diffstat (limited to 'spec/ruby/core/range/first_spec.rb')
-rw-r--r-- | spec/ruby/core/range/first_spec.rb | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/spec/ruby/core/range/first_spec.rb b/spec/ruby/core/range/first_spec.rb new file mode 100644 index 0000000000..7cd3781d34 --- /dev/null +++ b/spec/ruby/core/range/first_spec.rb @@ -0,0 +1,49 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../shared/begin', __FILE__) + +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 + lambda { (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") + lambda { (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 + lambda { (2..3).first(nil) }.should raise_error(TypeError) + end + + it "raises a TypeError when passed a String" do + lambda { (2..3).first("1") }.should raise_error(TypeError) + end +end |