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require_relative '../../spec_helper'
require 'bigdecimal'
describe "Kernel#BigDecimal" do
it "creates a new object of class BigDecimal" do
BigDecimal("3.14159").should be_kind_of(BigDecimal)
(0..9).each {|i|
BigDecimal("1#{i}").should == 10 + i
BigDecimal("-1#{i}").should == -10 - i
BigDecimal("1E#{i}").should == 10**i
BigDecimal("1000000E-#{i}").should == 10**(6-i).to_f
# ^ to_f to avoid Rational type
}
(1..9).each {|i|
BigDecimal("100.#{i}").to_s.should =~ /\A0\.100#{i}E3\z/i
BigDecimal("-100.#{i}").to_s.should =~ /\A-0\.100#{i}E3\z/i
}
end
it "accepts significant digits >= given precision" do
BigDecimal("3.1415923", 10).precs[1].should >= 10
end
it "determines precision from initial value" do
pi_string = "3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196442881097566593014782083152134043"
BigDecimal(pi_string).precs[1].should >= pi_string.size-1
end
it "ignores leading whitespace" do
BigDecimal(" \t\n \r1234").should == BigDecimal("1234")
BigDecimal(" \t\n \rNaN \n").nan?.should == true
BigDecimal(" \t\n \rInfinity \n").infinite?.should == 1
BigDecimal(" \t\n \r-Infinity \n").infinite?.should == -1
end
it "ignores trailing garbage" do
BigDecimal("123E45ruby").should == BigDecimal("123E45")
BigDecimal("123x45").should == BigDecimal("123")
BigDecimal("123.4%E5").should == BigDecimal("123.4")
BigDecimal("1E2E3E4E5E").should == BigDecimal("100")
end
ruby_version_is ""..."2.4" do
it "treats invalid strings as 0.0" do
BigDecimal("ruby").should == BigDecimal("0.0")
BigDecimal(" \t\n \r-\t\t\tInfinity \n").should == BigDecimal("0.0")
end
end
ruby_version_is "2.4" do
it "raises ArgumentError for invalid strings" do
lambda { BigDecimal("ruby") }.should raise_error(ArgumentError)
lambda { BigDecimal(" \t\n \r-\t\t\tInfinity \n") }.should raise_error(ArgumentError)
end
end
it "allows omitting the integer part" do
BigDecimal(".123").should == BigDecimal("0.123")
end
it "allows for underscores in all parts" do
reference = BigDecimal("12345.67E89")
BigDecimal("12_345.67E89").should == reference
BigDecimal("1_2_3_4_5_._6____7_E89").should == reference
BigDecimal("12345_.67E_8__9_").should == reference
end
it "accepts NaN and [+-]Infinity" do
BigDecimal("NaN").nan?.should == true
pos_inf = BigDecimal("Infinity")
pos_inf.finite?.should == false
pos_inf.should > 0
pos_inf.should == BigDecimal("+Infinity")
neg_inf = BigDecimal("-Infinity")
neg_inf.finite?.should == false
neg_inf.should < 0
end
it "allows for [eEdD] as exponent separator" do
reference = BigDecimal("12345.67E89")
BigDecimal("12345.67e89").should == reference
BigDecimal("12345.67E89").should == reference
BigDecimal("12345.67d89").should == reference
BigDecimal("12345.67D89").should == reference
end
it "allows for varying signs" do
reference = BigDecimal("123.456E1")
BigDecimal("+123.456E1").should == reference
BigDecimal("-123.456E1").should == -reference
BigDecimal("123.456E+1").should == reference
BigDecimal("12345.6E-1").should == reference
BigDecimal("+123.456E+1").should == reference
BigDecimal("+12345.6E-1").should == reference
BigDecimal("-123.456E+1").should == -reference
BigDecimal("-12345.6E-1").should == -reference
end
it 'raises ArgumentError when Float is used without precision' do
lambda { BigDecimal(1.0) }.should raise_error(ArgumentError)
end
end
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