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require File.expand_path('../../../spec_helper', __FILE__)
ruby_version_is "1.8.7" do
describe "Range#min" do
it "returns the minimum value in the range when called with no arguments" do
(1..10).min.should == 1
('f'..'l').min.should == 'f'
end
ruby_version_is "1.9" do
it "returns the minimum value in the Float range when called with no arguments" do
(303.20..908.1111).min.should == 303.20
end
end
ruby_version_is ""..."1.9" do
it "raises TypeError when called on a Float range" do
lambda { (303.20..908.1111).min }.should raise_error(TypeError)
end
end
it "returns nil when the start point is greater than the endpoint" do
(100..10).min.should be_nil
('z'..'l').min.should be_nil
end
it "returns nil when the endpoint equals the start point and the range is exclusive" do
(7...7).min.should be_nil
end
it "returns the start point when the endpoint equals the start point and the range is inclusive" do
(7..7).min.should equal(7)
end
ruby_version_is "1.9" do
it "returns nil when the start point is greater than the endpoint in a Float range" do
(3003.20..908.1111).min.should be_nil
end
it "returns start point when the range is Time..Time(included end point)" do
time_start = Time.now
time_end = Time.now + 1.0
(time_start..time_end).min.should equal(time_start)
end
it "returns start point when the range is Time...Time(excluded end point)" do
time_start = Time.now
time_end = Time.now + 1.0
(time_start...time_end).min.should equal(time_start)
end
end
end
describe "Range#min given a block" do
it "passes each pair of values in the range to the block" do
acc = []
(1..10).min {|a,b| acc << [a,b]; a }
acc.flatten!
(1..10).each do |value|
acc.include?(value).should be_true
end
end
it "passes each pair of elements to the block where the first argument is the current element, and the last is the first element" do
acc = []
(1..5).min {|a,b| acc << [a,b]; a }
acc.should == [[2, 1], [3, 1], [4, 1], [5, 1]]
end
it "calls #> and #< on the return value of the block" do
obj = mock('obj')
obj.should_receive(:>).exactly(2).times
obj.should_receive(:<).exactly(2).times
(1..3).min {|a,b| obj }
end
it "returns the element the block determines to be the minimum" do
(1..3).min {|a,b| -3 }.should == 3
end
it "returns nil when the start point is greater than the endpoint" do
(100..10).min {|x,y| x <=> y}.should be_nil
('z'..'l').min {|x,y| x <=> y}.should be_nil
(7...7).min {|x,y| x <=> y}.should be_nil
end
end
end
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