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require File.expand_path('../../../spec_helper', __FILE__)
require 'bigdecimal'
describe "BigDecimal#truncate" do
before :each do
@arr = ['3.14159', '8.7', "0.314159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196442881097566593014782083152134043E1"]
@big = BigDecimal("123456.789")
@nan = BigDecimal('NaN')
@infinity = BigDecimal('Infinity')
@infinity_negative = BigDecimal('-Infinity')
end
it "returns value of type Integer." do
@arr.each do |x|
BigDecimal(x).truncate.kind_of?(Integer).should == true
end
end
it "returns the integer part as a BigDecimal if no precision given" do
BigDecimal(@arr[0]).truncate.should == 3
BigDecimal(@arr[1]).truncate.should == 8
BigDecimal(@arr[2]).truncate.should == 3
BigDecimal('0').truncate.should == 0
BigDecimal('0.1').truncate.should == 0
BigDecimal('-0.1').truncate.should == 0
BigDecimal('1.5').truncate.should == 1
BigDecimal('-1.5').truncate.should == -1
BigDecimal('1E10').truncate.should == BigDecimal('1E10')
BigDecimal('-1E10').truncate.should == BigDecimal('-1E10')
BigDecimal('1.8888E10').truncate.should == BigDecimal('1.8888E10')
BigDecimal('-1E-1').truncate.should == 0
end
it "returns value of given precision otherwise" do
BigDecimal('-1.55').truncate(1).should == BigDecimal('-1.5')
BigDecimal('1.55').truncate(1).should == BigDecimal('1.5')
BigDecimal(@arr[0]).truncate(2).should == BigDecimal("3.14")
BigDecimal('123.456').truncate(2).should == BigDecimal("123.45")
BigDecimal('123.456789').truncate(4).should == BigDecimal("123.4567")
BigDecimal('0.456789').truncate(10).should == BigDecimal("0.456789")
BigDecimal('-1E-1').truncate(1).should == BigDecimal('-0.1')
BigDecimal('-1E-1').truncate(2).should == BigDecimal('-0.1E0')
BigDecimal('-1E-1').truncate.should == BigDecimal('0')
BigDecimal('-1E-1').truncate(0).should == BigDecimal('0')
BigDecimal('-1E-1').truncate(-1).should == BigDecimal('0')
BigDecimal('-1E-1').truncate(-2).should == BigDecimal('0')
BigDecimal(@arr[1]).truncate(1).should == BigDecimal("8.7")
BigDecimal(@arr[2]).truncate(100).should == BigDecimal(\
"3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679")
end
it "sets n digits left of the decimal point to 0, if given n < 0" do
@big.truncate(-1).should == BigDecimal("123450.0")
@big.truncate(-2).should == BigDecimal("123400.0")
BigDecimal(@arr[2]).truncate(-1).should == 0
end
it "returns NaN if self is NaN" do
@nan.truncate(-1).nan?.should == true
@nan.truncate(+1).nan?.should == true
@nan.truncate(0).nan?.should == true
end
it "returns Infinity if self is infinite" do
@infinity.truncate(-1).should == @infinity
@infinity.truncate(+1).should == @infinity
@infinity.truncate(0).should == @infinity
@infinity_negative.truncate(-1).should == @infinity_negative
@infinity_negative.truncate(+1).should == @infinity_negative
@infinity_negative.truncate(0).should == @infinity_negative
end
it "returns the same value if self is special value" do
lambda { @nan.truncate }.should raise_error(FloatDomainError)
lambda { @infinity.truncate }.should raise_error(FloatDomainError)
lambda { @infinity_negative.truncate }.should raise_error(FloatDomainError)
end
end
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