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describe "Array literals" do
it "[] accepts a literal hash without curly braces as its last parameter" do
["foo", "bar" => :baz].should == ["foo", {"bar" => :baz}]
[1, 2, 3 => 6, 4 => 24].should == [1, 2, {3 => 6, 4 => 24}]
end
it "[] treats splatted nil as no element" do
[*nil].should == []
[1, *nil].should == [1]
[1, 2, *nil].should == [1, 2]
[1, *nil, 3].should == [1, 3]
[*nil, *nil, *nil].should == []
end
end
describe "The unpacking splat operator (*)" do
it "when applied to a non-Array value attempts to coerce it to Array if the object respond_to?(:to_a)" do
obj = mock("pseudo-array")
obj.should_receive(:to_a).and_return([2, 3, 4])
[1, *obj].should == [1, 2, 3, 4]
end
it "when applied to a non-Array value uses it unchanged if it does not respond_to?(:to_a)" do
obj = Object.new
obj.should_not respond_to(:to_a)
[1, *obj].should == [1, obj]
end
it "can be used before other non-splat elements" do
a = [1, 2]
[0, *a, 3].should == [0, 1, 2, 3]
end
it "can be used multiple times in the same containing array" do
a = [1, 2]
b = [1, 0]
[*a, 3, *a, *b].should == [1, 2, 3, 1, 2, 1, 0]
end
end
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