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require_relative '../../spec_helper'
describe "Array#min" do
ruby_version_is "2.4" do
it "is defined on Array" do
[1].method(:max).owner.should equal Array
end
end
it "returns nil with no values" do
[].min.should == nil
end
it "returns only element in one element array" do
[1].min.should == 1
end
it "returns smallest value with multiple elements" do
[1,2].min.should == 1
[2,1].min.should == 1
end
describe "given a block with one argument" do
it "yields in turn the last length-1 values from the array" do
ary = []
result = [1,2,3,4,5].min {|x| ary << x; x}
ary.should == [2,3,4,5]
result.should == 1
end
end
end
# From Enumerable#min, copied for better readability
describe "Array#min" do
before :each do
@a = [2, 4, 6, 8, 10]
@e_strs = ["333", "22", "666666", "1", "55555", "1010101010"]
@e_ints = [ 333, 22, 666666, 55555, 1010101010]
end
it "min should return the minimum element" do
[18, 42].min.should == 18
[2, 5, 3, 6, 1, 4].min.should == 1
end
it "returns the minimum (basic cases)" do
[55].min.should == 55
[11,99].min.should == 11
[99,11].min.should == 11
[2, 33, 4, 11].min.should == 2
[1,2,3,4,5].min.should == 1
[5,4,3,2,1].min.should == 1
[4,1,3,5,2].min.should == 1
[5,5,5,5,5].min.should == 5
["aa","tt"].min.should == "aa"
["tt","aa"].min.should == "aa"
["2","33","4","11"].min.should == "11"
@e_strs.min.should == "1"
@e_ints.min.should == 22
end
it "returns nil for an empty Enumerable" do
[].min.should be_nil
end
it "raises a NoMethodError for elements without #<=>" do
lambda do
[BasicObject.new, BasicObject.new].min
end.should raise_error(NoMethodError)
end
it "raises an ArgumentError for incomparable elements" do
lambda do
[11,"22"].min
end.should raise_error(ArgumentError)
lambda do
[11,12,22,33].min{|a, b| nil}
end.should raise_error(ArgumentError)
end
it "returns the minimum when using a block rule" do
["2","33","4","11"].min {|a,b| a <=> b }.should == "11"
[ 2 , 33 , 4 , 11 ].min {|a,b| a <=> b }.should == 2
["2","33","4","11"].min {|a,b| b <=> a }.should == "4"
[ 2 , 33 , 4 , 11 ].min {|a,b| b <=> a }.should == 33
[ 1, 2, 3, 4 ].min {|a,b| 15 }.should == 1
[11,12,22,33].min{|a, b| 2 }.should == 11
@i = -2
[11,12,22,33].min{|a, b| @i += 1 }.should == 12
@e_strs.min {|a,b| a.length <=> b.length }.should == "1"
@e_strs.min {|a,b| a <=> b }.should == "1"
@e_strs.min {|a,b| a.to_i <=> b.to_i }.should == "1"
@e_ints.min {|a,b| a <=> b }.should == 22
@e_ints.min {|a,b| a.to_s <=> b.to_s }.should == 1010101010
end
it "returns the minimum for enumerables that contain nils" do
arr = [nil, nil, true]
arr.min { |a, b|
x = a.nil? ? -1 : a ? 0 : 1
y = b.nil? ? -1 : b ? 0 : 1
x <=> y
}.should == nil
end
it "gathers whole arrays as elements when each yields multiple" do
multi = [[1,2], [3,4,5], [6,7,8,9]]
multi.min.should == [1, 2]
end
end
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