1 files changed, 51 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/remainder_spec.rb b/spec/ruby/core/integer/remainder_spec.rb
new file mode 100644
index 0000000000..926b86135b
--- /dev/null
+++ b/spec/ruby/core/integer/remainder_spec.rb
@@ -0,0 +1,51 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+describe "Integer#remainder" do
+  context "fixnum" do
+    it "returns the remainder of dividing self by other" do
+      5.remainder(3).should == 2
+      5.remainder(3.0).should == 2.0
+      5.remainder(Rational(3, 1)).should == Rational(2, 1)
+    end
+
+    it "means x-y*(x/y).truncate" do
+      5.remainder(3).should == 2
+      5.remainder(3.3).should be_close(1.7, TOLERANCE)
+      5.remainder(3.7).should be_close(1.3, TOLERANCE)
+    end
+
+    it "keeps sign of self" do
+       5.remainder( 3).should ==  2
+       5.remainder(-3).should ==  2
+      -5.remainder( 3).should == -2
+      -5.remainder(-3).should == -2
+    end
+
+    it "raises TypeError if passed non-numeric argument" do
+      -> { 5.remainder("3") }.should raise_error(TypeError)
+      -> { 5.remainder(:"3") }.should raise_error(TypeError)
+      -> { 5.remainder([]) }.should raise_error(TypeError)
+      -> { 5.remainder(nil) }.should raise_error(TypeError)
+    end
+  end
+
+  context "bignum" do
+    it "returns the remainder of dividing self by other" do
+      a = bignum_value(79)
+      a.remainder(2).should == 1
+      a.remainder(97.345).should be_close(46.5674996147722, TOLERANCE)
+      a.remainder(bignum_value).should == 79
+    end
+
+    it "raises a ZeroDivisionError if other is zero and not a Float" do
+      lambda { bignum_value(66).remainder(0) }.should raise_error(ZeroDivisionError)
+    end
+
+    it "does raises ZeroDivisionError if other is zero and a Float" do
+      a = bignum_value(7)
+      b = bignum_value(32)
+      lambda { a.remainder(0.0) }.should raise_error(ZeroDivisionError)
+      lambda { b.remainder(-0.0) }.should raise_error(ZeroDivisionError)
+    end
+  end
+end