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require_relative '../../spec_helper'
require_relative 'fixtures/classes'
require_relative 'shared/enumerable_enumeratorized'
describe "Enumerable#slice_before" 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_before(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_before(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_before(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_before{|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
it "does not accept arguments" do
-> {
@enum.slice_before(1) {}
}.should raise_error(ArgumentError)
end
end
it "raises an ArgumentError when given an incorrect number of arguments" do
-> { @enum.slice_before("one", "two") }.should raise_error(ArgumentError)
-> { @enum.slice_before }.should raise_error(ArgumentError)
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_before { |i| i == [3, 4, 5] }.to_a
result.should == [[[1, 2]], [[3, 4, 5], [6, 7, 8, 9]]]
end
end
it_behaves_like :enumerable_enumeratorized_with_unknown_size, [:slice_before, 3]
end
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