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require File.expand_path('../../../../spec_helper', __FILE__)
describe :numeric_polar, shared: true do
before :each do
@pos_numbers = [
1,
3898172610**9,
987.18273,
Float::MAX,
Rational(13,7),
infinity_value,
]
@neg_numbers = @pos_numbers.map {|n| -n}
@numbers = @pos_numbers + @neg_numbers
@numbers.push(0, 0.0)
end
it "returns a two-element Array" do
@numbers.each do |number|
number.polar.should be_an_instance_of(Array)
number.polar.size.should == 2
end
end
it "sets the first value to the absolute value of self" do
@numbers.each do |number|
number.polar.first.should == number.abs
end
end
it "sets the last value to 0 if self is positive" do
(@numbers - @neg_numbers).each do |number|
number.should >= 0
number.polar.last.should == 0
end
end
it "sets the last value to Pi if self is negative" do
@neg_numbers.each do |number|
number.should < 0
number.polar.last.should == Math::PI
end
end
it "returns [NaN, NaN] if self is NaN" do
nan_value.polar.size.should == 2
nan_value.polar.first.nan?.should be_true
nan_value.polar.last.nan?.should be_true
end
end
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