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Diffstat (limited to 'spec/ruby/core/integer/remainder_spec.rb')
-rw-r--r-- | spec/ruby/core/integer/remainder_spec.rb | 51 |
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 |