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Diffstat (limited to 'spec/ruby/core/integer/comparison_spec.rb')
| -rw-r--r-- | spec/ruby/core/integer/comparison_spec.rb | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/spec/ruby/core/integer/comparison_spec.rb b/spec/ruby/core/integer/comparison_spec.rb new file mode 100644 index 0000000000..c54471dd16 --- /dev/null +++ b/spec/ruby/core/integer/comparison_spec.rb @@ -0,0 +1,189 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Integer#<=>" do + context "fixnum" do + it "returns -1 when self is less than the given argument" do + (-3 <=> -1).should == -1 + (-5 <=> 10).should == -1 + (-5 <=> -4.5).should == -1 + end + + it "returns 0 when self is equal to the given argument" do + (0 <=> 0).should == 0 + (954 <=> 954).should == 0 + (954 <=> 954.0).should == 0 + end + + it "returns 1 when self is greater than the given argument" do + (496 <=> 5).should == 1 + (200 <=> 100).should == 1 + (51 <=> 50.5).should == 1 + end + + it "returns nil when the given argument is not an Integer" do + (3 <=> mock('x')).should == nil + (3 <=> 'test').should == nil + end + end + + context "bignum" do + describe "with a Fixnum" do + it "returns -1 when other is larger" do + (-bignum_value <=> 2).should == -1 + end + + it "returns 1 when other is smaller" do + (bignum_value <=> 2).should == 1 + end + end + + describe "with a Bignum" do + describe "when other is negative" do + it "returns -1 when self is negative and other is larger" do + (-bignum_value(42) <=> -bignum_value).should == -1 + end + + it "returns 0 when other is equal" do + (-bignum_value <=> -bignum_value).should == 0 + end + + it "returns 1 when self is negative and other is smaller" do + (-bignum_value <=> -bignum_value(94)).should == 1 + end + + it "returns 1 when self is positive" do + (bignum_value <=> -bignum_value).should == 1 + end + end + + describe "when other is positive" do + it "returns -1 when self is negative" do + (-bignum_value <=> bignum_value).should == -1 + end + + it "returns -1 when self is positive and other is larger" do + (bignum_value <=> bignum_value(38)).should == -1 + end + + it "returns 0 when other is equal" do + (bignum_value <=> bignum_value).should == 0 + end + + it "returns 1 when other is smaller" do + (bignum_value(56) <=> bignum_value).should == 1 + end + end + end + + describe "with a Float" do + describe "when other is negative" do + it "returns -1 when self is negative and other is larger" do + (-bignum_value(0xffff) <=> -bignum_value.to_f).should == -1 + end + + it "returns 0 when other is equal" do + (-bignum_value <=> -bignum_value.to_f).should == 0 + end + + it "returns 1 when self is negative and other is smaller" do + (-bignum_value <=> -bignum_value(0xffef).to_f).should == 1 + end + + it "returns 1 when self is positive" do + (bignum_value <=> -bignum_value.to_f).should == 1 + end + end + + describe "when other is positive" do + it "returns -1 when self is negative" do + (-bignum_value <=> bignum_value.to_f).should == -1 + end + + it "returns -1 when self is positive and other is larger" do + (bignum_value <=> bignum_value(0xfffe).to_f).should == -1 + end + + it "returns 0 when other is equal" do + (bignum_value <=> bignum_value.to_f).should == 0 + end + + it "returns 1 when other is smaller" do + (bignum_value(0xfeff) <=> bignum_value.to_f).should == 1 + end + end + end + + describe "with an Object" do + before :each do + @big = bignum_value + @num = mock("value for Bignum#<=>") + end + + it "calls #coerce on other" do + @num.should_receive(:coerce).with(@big).and_return([@big.to_f, 2.5]) + @big <=> @num + end + + ruby_version_is ""..."2.5" do + it "returns nil if #coerce raises an exception" do + @num.should_receive(:coerce).with(@big).and_raise(RuntimeError) + lambda { + @result = (@big <=> @num) + }.should complain(/Numerical comparison operators will no more rescue exceptions/) + @result.should be_nil + end + end + + ruby_version_is "2.5" do + it "lets the exception go through if #coerce raises an exception" do + @num.should_receive(:coerce).with(@big).and_raise(RuntimeError.new("my error")) + lambda { + @big <=> @num + }.should raise_error(RuntimeError, "my error") + end + end + + it "raises an exception if #coerce raises a non-StandardError exception" do + @num.should_receive(:coerce).with(@big).and_raise(Exception) + lambda { @big <=> @num }.should raise_error(Exception) + end + + it "returns nil if #coerce does not return an Array" do + @num.should_receive(:coerce).with(@big).and_return(nil) + (@big <=> @num).should be_nil + end + + it "returns -1 if the coerced value is larger" do + @num.should_receive(:coerce).with(@big).and_return([@big, bignum_value(10)]) + (@big <=> @num).should == -1 + end + + it "returns 0 if the coerced value is equal" do + @num.should_receive(:coerce).with(@big).and_return([@big, bignum_value]) + (@big <=> @num).should == 0 + end + + it "returns 1 if the coerced value is smaller" do + @num.should_receive(:coerce).with(@big).and_return([@big, 22]) + (@big <=> @num).should == 1 + end + end + + # The tests below are taken from matz's revision 23730 for Ruby trunk + it "returns 1 when self is Infinity and other is a Bignum" do + (infinity_value <=> Float::MAX.to_i*2).should == 1 + end + + it "returns -1 when self is negative and other is Infinty" do + (-Float::MAX.to_i*2 <=> infinity_value).should == -1 + end + + it "returns 1 when self is negative and other is -Infinity" do + (-Float::MAX.to_i*2 <=> -infinity_value).should == 1 + end + + it "returns -1 when self is -Infinity and other is negative" do + (-infinity_value <=> -Float::MAX.to_i*2).should == -1 + end + end +end |