Move spec/rubyspec to spec/ruby for consistency

* Other ruby implementations use the spec/ruby directory.
  [Misc #13792] [ruby-core:82287]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59979 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

spec/ruby/library/bigdecimal/truncate_spec.rb

@@ -0,0 +1,81 @@
+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