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describe :enumerable_take, shared: true do
before :each do
@values = [4,3,2,1,0,-1]
@enum = EnumerableSpecs::Numerous.new(*@values)
end
it "returns the first count elements if given a count" do
@enum.send(@method, 2).should == [4, 3]
@enum.send(@method, 4).should == [4, 3, 2, 1] # See redmine #1686 !
end
it "returns an empty array when passed count on an empty array" do
empty = EnumerableSpecs::Empty.new
empty.send(@method, 0).should == []
empty.send(@method, 1).should == []
empty.send(@method, 2).should == []
end
it "returns an empty array when passed count == 0" do
@enum.send(@method, 0).should == []
end
it "returns an array containing the first element when passed count == 1" do
@enum.send(@method, 1).should == [4]
end
it "raises an ArgumentError when count is negative" do
lambda { @enum.send(@method, -1) }.should raise_error(ArgumentError)
end
it "returns the entire array when count > length" do
@enum.send(@method, 100).should == @values
@enum.send(@method, 8).should == @values # See redmine #1686 !
end
it "tries to convert the passed argument to an Integer using #to_int" do
obj = mock('to_int')
obj.should_receive(:to_int).and_return(3).at_most(:twice) # called twice, no apparent reason. See redmine #1554
@enum.send(@method, obj).should == [4, 3, 2]
end
it "raises a TypeError if the passed argument is not numeric" do
lambda { @enum.send(@method, nil) }.should raise_error(TypeError)
lambda { @enum.send(@method, "a") }.should raise_error(TypeError)
obj = mock("nonnumeric")
lambda { @enum.send(@method, obj) }.should raise_error(TypeError)
end
it "gathers whole arrays as elements when each yields multiple" do
multi = EnumerableSpecs::YieldsMulti.new
multi.send(@method, 1).should == [[1, 2]]
end
it "consumes only what is needed" do
thrower = EnumerableSpecs::ThrowingEach.new
thrower.send(@method, 0).should == []
counter = EnumerableSpecs::EachCounter.new(1,2,3,4)
counter.send(@method, 2).should == [1,2]
counter.times_called.should == 1
counter.times_yielded.should == 2
end
end
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