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require 'bigdecimal'
describe :bigdecimal_quo, shared: true do
before :each do
@one = BigDecimal("1")
@zero = BigDecimal("0")
@zero_plus = BigDecimal("+0")
@zero_minus = BigDecimal("-0")
@two = BigDecimal("2")
@three = BigDecimal("3")
@eleven = BigDecimal("11")
@nan = BigDecimal("NaN")
@infinity = BigDecimal("Infinity")
@infinity_minus = BigDecimal("-Infinity")
@one_minus = BigDecimal("-1")
@frac_1 = BigDecimal("1E-99999")
@frac_2 = BigDecimal("0.9E-99999")
end
it "returns a / b" do
@two.send(@method, @one, *@object).should == @two
@one.send(@method, @two, *@object).should == BigDecimal("0.5")
@eleven.send(@method, @three, *@object).should be_close(@three + (@two / @three), TOLERANCE)
@one.send(@method, @one_minus, *@object).should == @one_minus
@one_minus.send(@method, @one_minus, *@object).should == @one
@frac_2.send(@method, @frac_1, *@object).should == BigDecimal("0.9")
@frac_1.send(@method, @frac_1, *@object).should == @one
@one.send(@method, BigDecimal('-2E5555'), *@object).should == BigDecimal('-0.5E-5555')
@one.send(@method, BigDecimal('2E-5555'), *@object).should == BigDecimal('0.5E5555')
end
describe "with Object" do
it "tries to coerce the other operand to self" do
object = mock("Object")
object.should_receive(:coerce).with(@one).and_return([@one, @two])
@one.send(@method, object, *@object).should == BigDecimal("0.5")
end
end
it "returns 0 if divided by Infinity" do
@zero.send(@method, @infinity, *@object).should == 0
@frac_2.send(@method, @infinity, *@object).should == 0
end
it "returns (+|-) Infinity if (+|-) Infinity divided by one" do
@infinity_minus.send(@method, @one, *@object).should == @infinity_minus
@infinity.send(@method, @one, *@object).should == @infinity
@infinity_minus.send(@method, @one_minus, *@object).should == @infinity
end
it "returns NaN if Infinity / ((+|-) Infinity)" do
@infinity.send(@method, @infinity_minus, *@object).should.nan?
@infinity_minus.send(@method, @infinity, *@object).should.nan?
end
it "returns (+|-) Infinity if divided by zero" do
@one.send(@method, @zero, *@object).should == @infinity
@one.send(@method, @zero_plus, *@object).should == @infinity
@one.send(@method, @zero_minus, *@object).should == @infinity_minus
end
it "returns NaN if zero is divided by zero" do
@zero.send(@method, @zero, *@object).should.nan?
@zero_minus.send(@method, @zero_plus, *@object).should.nan?
@zero_plus.send(@method, @zero_minus, *@object).should.nan?
end
end
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