ruby--ruby/spec/ruby/core/integer/sqrt_spec.rb

require_relative '../../spec_helper'

describe "Integer.sqrt" do
  it "returns an integer" do
    Integer.sqrt(10).should be_kind_of(Integer)
  end

  it "returns the integer square root of the argument" do
    Integer.sqrt(0).should == 0
    Integer.sqrt(1).should == 1
    Integer.sqrt(24).should == 4
    Integer.sqrt(25).should == 5
    Integer.sqrt(10**400).should == 10**200
  end

  it "raises a Math::DomainError if the argument is negative" do
    -> { Integer.sqrt(-4) }.should raise_error(Math::DomainError)
  end

  it "accepts any argument that can be coerced to Integer" do
    Integer.sqrt(10.0).should == 3
  end

  it "converts the argument with #to_int" do
    Integer.sqrt(mock_int(10)).should == 3
  end

  it "raises a TypeError if the argument cannot be coerced to Integer" do
    -> { Integer.sqrt("test") }.should raise_error(TypeError)
  end
end