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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
describe "Enumerable#slice_after" do
before :each do
@enum = EnumerableSpecs::Numerous.new(7, 6, 5, 4, 3, 2, 1)
end
describe "when given an argument and no block" do
it "calls === on the argument to determine when to yield" do
arg = mock("filter")
arg.should_receive(:===).and_return(false, true, false, false, false, true, false)
e = @enum.slice_after(arg)
e.should be_an_instance_of(Enumerator)
e.to_a.should == [[7, 6], [5, 4, 3, 2], [1]]
end
it "doesn't yield an empty array if the filter matches the first entry or the last entry" do
arg = mock("filter")
arg.should_receive(:===).and_return(true).exactly(7)
e = @enum.slice_after(arg)
e.to_a.should == [[7], [6], [5], [4], [3], [2], [1]]
end
it "uses standard boolean as a test" do
arg = mock("filter")
arg.should_receive(:===).and_return(false, :foo, nil, false, false, 42, false)
e = @enum.slice_after(arg)
e.to_a.should == [[7, 6], [5, 4, 3, 2], [1]]
end
end
describe "when given a block" do
describe "and no argument" do
it "calls the block to determine when to yield" do
e = @enum.slice_after{ |i| i == 6 || i == 2 }
e.should be_an_instance_of(Enumerator)
e.to_a.should == [[7, 6], [5, 4, 3, 2], [1]]
end
end
describe "and an argument" do
it "raises an ArgumentError" do
-> { @enum.slice_after(42) { |i| i == 6 } }.should raise_error(ArgumentError)
end
end
end
it "raises an ArgumentError when given an incorrect number of arguments" do
-> { @enum.slice_after("one", "two") }.should raise_error(ArgumentError)
-> { @enum.slice_after }.should raise_error(ArgumentError)
end
end
describe "when an iterator method yields more than one value" do
it "processes all yielded values" do
enum = EnumerableSpecs::YieldsMulti.new
result = enum.slice_after { |i| i == [3, 4, 5] }.to_a
result.should == [[[1, 2], [3, 4, 5]], [[6, 7, 8, 9]]]
end
end
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