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106 lines
3.3 KiB
Ruby
106 lines
3.3 KiB
Ruby
describe "Array literals" do
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it "[] should return a new array populated with the given elements" do
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array = [1, 'a', nil]
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array.should be_kind_of(Array)
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array[0].should == 1
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array[1].should == 'a'
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array[2].should == nil
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end
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it "[] treats empty expressions as nil elements" do
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array = [0, (), 2, (), 4]
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array.should be_kind_of(Array)
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array[0].should == 0
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array[1].should == nil
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array[2].should == 2
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array[3].should == nil
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array[4].should == 4
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end
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it "[] accepts a literal hash without curly braces as its only parameter" do
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["foo" => :bar, :baz => 42].should == [{"foo" => :bar, :baz => 42}]
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end
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end
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describe "Bareword array literal" do
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it "%w() transforms unquoted barewords into an array" do
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a = 3
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%w(a #{3+a} 3).should == ["a", '#{3+a}', "3"]
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end
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it "%W() transforms unquoted barewords into an array, supporting interpolation" do
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a = 3
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%W(a #{3+a} 3).should == ["a", '6', "3"]
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end
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it "%W() always treats interpolated expressions as a single word" do
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a = "hello world"
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%W(a b c #{a} d e).should == ["a", "b", "c", "hello world", "d", "e"]
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end
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it "treats consecutive whitespace characters the same as one" do
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%w(a b c d).should == ["a", "b", "c", "d"]
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%W(hello
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world).should == ["hello", "world"]
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end
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it "treats whitespace as literals characters when escaped by a backslash" do
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%w(a b\ c d e).should == ["a", "b c", "d", "e"]
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%w(a b\
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c d).should == ["a", "b\nc", "d"]
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%W(a\ b\tc).should == ["a ", "b\tc"]
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%W(white\ \ \ \ \ space).should == ["white ", " ", " ", " space"]
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end
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end
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describe "The unpacking splat operator (*)" do
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it "when applied to a literal nested array, unpacks its elements into the containing array" do
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[1, 2, *[3, 4, 5]].should == [1, 2, 3, 4, 5]
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end
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it "when applied to a nested referenced array, unpacks its elements into the containing array" do
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splatted_array = [3, 4, 5]
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[1, 2, *splatted_array].should == [1, 2, 3, 4, 5]
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end
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it "when applied to a value with no other items in the containing array, coerces the passed value to an array and returns it unchanged" do
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splatted_array = [3, 4, 5]
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[*splatted_array].should equal(splatted_array)
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end
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it "unpacks the start and count arguments in an array slice assignment" do
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alphabet_1 = ['a'..'z'].to_a
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alphabet_2 = alphabet_1.dup
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start_and_count_args = [1, 10]
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alphabet_1[1, 10] = 'a'
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alphabet_2[*start_and_count_args] = 'a'
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alphabet_1.should == alphabet_2
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end
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it "unpacks arguments as if they were listed statically" do
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static = [1,2,3,4]
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receiver = static.dup
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args = [0,1]
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static[0,1] = []
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static.should == [2,3,4]
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receiver[*args] = []
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receiver.should == static
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end
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it "unpacks a literal array into arguments in a method call" do
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tester = ArraySpecSplat.new
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tester.unpack_3args(*[1, 2, 3]).should == [1, 2, 3]
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tester.unpack_4args(1, 2, *[3, 4]).should == [1, 2, 3, 4]
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tester.unpack_4args("a", %w(b c), *%w(d e)).should == ["a", ["b", "c"], "d", "e"]
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end
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it "unpacks a referenced array into arguments in a method call" do
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args = [1, 2, 3]
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tester = ArraySpecSplat.new
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tester.unpack_3args(*args).should == [1, 2, 3]
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tester.unpack_4args(0, *args).should == [0, 1, 2, 3]
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end
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end
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