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require_relative '../../spec_helper'
describe 'Range#minmax' do
before(:each) do
@x = mock('x')
@y = mock('y')
@x.should_receive(:<=>).with(@y).any_number_of_times.and_return(-1) # x < y
@x.should_receive(:<=>).with(@x).any_number_of_times.and_return(0) # x == x
@y.should_receive(:<=>).with(@x).any_number_of_times.and_return(1) # y > x
@y.should_receive(:<=>).with(@y).any_number_of_times.and_return(0) # y == y
end
describe 'on an inclusive range' do
it 'should raise RangeError on an endless range without iterating the range' do
@x.should_not_receive(:succ)
range = (@x..)
-> { range.minmax }.should raise_error(RangeError, 'cannot get the maximum of endless range')
end
it 'raises RangeError or ArgumentError on a beginless range' do
range = (..@x)
-> { range.minmax }.should raise_error(StandardError) { |e|
if RangeError === e
# error from #min
-> { raise e }.should raise_error(RangeError, 'cannot get the minimum of beginless range')
else
# error from #max
-> { raise e }.should raise_error(ArgumentError, 'comparison of NilClass with MockObject failed')
end
}
end
it 'should return beginning of range if beginning and end are equal without iterating the range' do
@x.should_not_receive(:succ)
(@x..@x).minmax.should == [@x, @x]
end
it 'should return nil pair if beginning is greater than end without iterating the range' do
@y.should_not_receive(:succ)
(@y..@x).minmax.should == [nil, nil]
end
it 'should return the minimum and maximum values for a non-numeric range without iterating the range' do
@x.should_not_receive(:succ)
(@x..@y).minmax.should == [@x, @y]
end
it 'should return the minimum and maximum values for a numeric range' do
(1..3).minmax.should == [1, 3]
end
it 'should return the minimum and maximum values for a numeric range without iterating the range' do
# We cannot set expectations on integers,
# so we "prevent" iteration by picking a value that would iterate until the spec times out.
range_end = Float::INFINITY
(1..range_end).minmax.should == [1, range_end]
end
it 'should return the minimum and maximum values according to the provided block by iterating the range' do
@x.should_receive(:succ).once.and_return(@y)
(@x..@y).minmax { |x, y| - (x <=> y) }.should == [@y, @x]
end
end
describe 'on an exclusive range' do
it 'should raise RangeError on an endless range' do
@x.should_not_receive(:succ)
range = (@x...)
-> { range.minmax }.should raise_error(RangeError, 'cannot get the maximum of endless range')
end
it 'should raise RangeError on a beginless range' do
range = (...@x)
-> { range.minmax }.should raise_error(RangeError,
/cannot get the maximum of beginless range with custom comparison method|cannot get the minimum of beginless range/)
end
it 'should return nil pair if beginning and end are equal without iterating the range' do
@x.should_not_receive(:succ)
(@x...@x).minmax.should == [nil, nil]
end
it 'should return nil pair if beginning is greater than end without iterating the range' do
@y.should_not_receive(:succ)
(@y...@x).minmax.should == [nil, nil]
end
it 'should return the minimum and maximum values for a non-numeric range by iterating the range' do
@x.should_receive(:succ).once.and_return(@y)
(@x...@y).minmax.should == [@x, @x]
end
it 'should return the minimum and maximum values for a numeric range' do
(1...3).minmax.should == [1, 2]
end
it 'should return the minimum and maximum values for a numeric range without iterating the range' do
# We cannot set expectations on integers,
# so we "prevent" iteration by picking a value that would iterate until the spec times out.
range_end = bignum_value
(1...range_end).minmax.should == [1, range_end - 1]
end
it 'raises TypeError if the end value is not an integer' do
range = (0...Float::INFINITY)
-> { range.minmax }.should raise_error(TypeError, 'cannot exclude non Integer end value')
end
it 'should return the minimum and maximum values according to the provided block by iterating the range' do
@x.should_receive(:succ).once.and_return(@y)
(@x...@y).minmax { |x, y| - (x <=> y) }.should == [@x, @x]
end
end
end
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