ruby--ruby/spec/ruby/core/float/divmod_spec.rb

require_relative '../../spec_helper'

describe "Float#divmod" do
  it "returns an [quotient, modulus] from dividing self by other" do
    values = 3.14.divmod(2)
    values[0].should eql(1)
    values[1].should be_close(1.14, TOLERANCE)
    values = 2.8284.divmod(3.1415)
    values[0].should eql(0)
    values[1].should be_close(2.8284, TOLERANCE)
    values = -1.0.divmod(bignum_value)
    values[0].should eql(-1)
    values[1].should be_close(9223372036854775808.000, TOLERANCE)
    values = -1.0.divmod(1)
    values[0].should eql(-1)
    values[1].should eql(0.0)
  end

  # Behaviour established as correct in r23953
  it "raises a FloatDomainError if self is NaN" do
    lambda { nan_value.divmod(1) }.should raise_error(FloatDomainError)
  end

  # Behaviour established as correct in r23953
  it "raises a FloatDomainError if other is NaN" do
    lambda { 1.divmod(nan_value) }.should raise_error(FloatDomainError)
  end

  # Behaviour established as correct in r23953
  it "raises a FloatDomainError if self is Infinity" do
    lambda { infinity_value.divmod(1) }.should raise_error(FloatDomainError)
  end

  it "raises a ZeroDivisionError if other is zero" do
    lambda { 1.0.divmod(0)   }.should raise_error(ZeroDivisionError)
    lambda { 1.0.divmod(0.0) }.should raise_error(ZeroDivisionError)
  end

  # redmine #5276"
  it "returns the correct [quotient, modulus] even for large quotient" do
    0.59.divmod(7.761021455128987e-11).first.should eql(7602092113)
  end
end