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require_relative '../../spec_helper'
require 'bigdecimal'
describe "Core extension by bigdecimal" do
context "Integer#coerce" do
it "produces Floats" do
x, y = 3.coerce(BigDecimal("3.4"))
x.class.should == Float
x.should == 3.4
y.class.should == Float
y.should == 3.0
end
end
describe "Time.at passed BigDecimal" do
it "doesn't round input value" do
Time.at(BigDecimal('1.1')).to_f.should == 1.1
end
end
describe "BigDecimal#log" do
it "handles high-precision Rational arguments" do
result = BigDecimal('0.22314354220170971436137296411949880462556361100856391620766259404746040597133837784E0')
r = Rational(1_234_567_890, 987_654_321)
BigMath.log(r, 50).should == result
end
end
describe "Rational#coerce" do
it "returns the passed argument, self as Float, when given a Float" do
result = Rational(3, 4).coerce(1.0)
result.should == [1.0, 0.75]
result.first.is_a?(Float).should be_true
result.last.is_a?(Float).should be_true
end
it "returns the passed argument, self as Rational, when given an Integer" do
result = Rational(3, 4).coerce(10)
result.should == [Rational(10, 1), Rational(3, 4)]
result.first.is_a?(Rational).should be_true
result.last.is_a?(Rational).should be_true
end
it "coerces to Rational, when given a Complex" do
Rational(3, 4).coerce(Complex(5)).should == [Rational(5, 1), Rational(3, 4)]
Rational(12, 4).coerce(Complex(5, 1)).should == [Complex(5, 1), Complex(3)]
end
it "returns [argument, self] when given a Rational" do
Rational(3, 7).coerce(Rational(9, 2)).should == [Rational(9, 2), Rational(3, 7)]
end
it "raises an error when passed a BigDecimal" do
-> {
Rational(500, 3).coerce(BigDecimal('166.666666666'))
}.should raise_error(TypeError, /BigDecimal can't be coerced into Rational/)
end
end
end
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