1 files changed, 100 insertions, 0 deletions
diff --git a/spec/ruby/library/bigdecimal/floor_spec.rb b/spec/ruby/library/bigdecimal/floor_spec.rb
new file mode 100644
index 0000000000..0bae6e4ab0
--- /dev/null
+++ b/spec/ruby/library/bigdecimal/floor_spec.rb
@@ -0,0 +1,100 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require 'bigdecimal'
+
+describe "BigDecimal#floor" do
+  before :each do
+    @one = BigDecimal("1")
+    @three = BigDecimal("3")
+    @four = BigDecimal("4")
+    @zero = BigDecimal("0")
+    @mixed = BigDecimal("1.23456789")
+    @mixed_big = BigDecimal("1.23456789E100")
+    @pos_int = BigDecimal("2E5555")
+    @neg_int = BigDecimal("-2E5555")
+    @pos_frac = BigDecimal("2E-9999")
+    @neg_frac = BigDecimal("-2E-9999")
+
+    @infinity = BigDecimal("Infinity")
+    @infinity_neg = BigDecimal("-Infinity")
+    @nan = BigDecimal("NaN")
+    @zero_pos = BigDecimal("+0")
+    @zero_neg = BigDecimal("-0")
+  end
+
+  it "returns the greatest integer smaller or equal to self" do
+    @pos_int.floor.should == @pos_int
+    @neg_int.floor.should == @neg_int
+    @pos_frac.floor.should == @zero
+    @neg_frac.floor.should == BigDecimal("-1")
+    @zero.floor.should == 0
+    @zero_pos.floor.should == @zero_pos
+    @zero_neg.floor.should == @zero_neg
+
+    BigDecimal('2.3').floor.should == 2
+    BigDecimal('2.5').floor.should == 2
+    BigDecimal('2.9999').floor.should == 2
+    BigDecimal('-2.3').floor.should == -3
+    BigDecimal('-2.5').floor.should == -3
+    BigDecimal('-2.9999').floor.should == -3
+    BigDecimal('0.8').floor.should == 0
+    BigDecimal('-0.8').floor.should == -1
+  end
+
+  it "raise exception, if self is special value" do
+    lambda { @infinity.floor }.should raise_error(FloatDomainError)
+    lambda { @infinity_neg.floor }.should raise_error(FloatDomainError)
+    lambda { @nan.floor }.should raise_error(FloatDomainError)
+  end
+
+  it "returns n digits right of the decimal point if given n > 0" do
+    @mixed.floor(1).should == BigDecimal("1.2")
+    @mixed.floor(5).should == BigDecimal("1.23456")
+
+    BigDecimal("-0.03").floor(1).should == BigDecimal("-0.1")
+    BigDecimal("0.03").floor(1).should == BigDecimal("0")
+
+    BigDecimal("23.45").floor(0).should == BigDecimal('23')
+    BigDecimal("23.45").floor(1).should == BigDecimal('23.4')
+    BigDecimal("23.45").floor(2).should == BigDecimal('23.45')
+
+    BigDecimal("-23.45").floor(0).should == BigDecimal('-24')
+    BigDecimal("-23.45").floor(1).should == BigDecimal('-23.5')
+    BigDecimal("-23.45").floor(2).should == BigDecimal('-23.45')
+
+    BigDecimal("2E-10").floor(0).should == @zero
+    BigDecimal("2E-10").floor(9).should == @zero
+    BigDecimal("2E-10").floor(10).should == BigDecimal('2E-10')
+    BigDecimal("2E-10").floor(11).should == BigDecimal('2E-10')
+
+    (1..10).each do |n|
+      # 0.3, 0.33, 0.333, etc.
+      (@one.div(@three,20)).floor(n).should == BigDecimal("0.#{'3'*n}")
+      # 1.3, 1.33, 1.333, etc.
+      (@four.div(@three,20)).floor(n).should == BigDecimal("1.#{'3'*n}")
+      (BigDecimal('31').div(@three,20)).floor(n).should == BigDecimal("10.#{'3'*n}")
+    end
+    (1..10).each do |n|
+      # -0.4, -0.34, -0.334, etc.
+      (-@one.div(@three,20)).floor(n).should == BigDecimal("-0.#{'3'*(n-1)}4")
+    end
+    (1..10).each do |n|
+      (@three.div(@one,20)).floor(n).should == @three
+    end
+    (1..10).each do |n|
+      (-@three.div(@one,20)).floor(n).should == -@three
+    end
+  end
+
+  it "sets n digits left of the decimal point to 0, if given n < 0" do
+    BigDecimal("13345.234").floor(-2).should == BigDecimal("13300.0")
+    @mixed_big.floor(-99).should == BigDecimal("0.12E101")
+    @mixed_big.floor(-100).should == BigDecimal("0.1E101")
+    @mixed_big.floor(-95).should == BigDecimal("0.123456E101")
+    (1..10).each do |n|
+      BigDecimal('1.8').floor(-n).should == @zero
+    end
+    BigDecimal("1E10").floor(-30).should == @zero
+    BigDecimal("-1E10").floor(-30).should == BigDecimal('-1E30')
+  end
+
+end