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Diffstat (limited to 'spec/ruby/core/float/to_s_spec.rb')
-rw-r--r-- | spec/ruby/core/float/to_s_spec.rb | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/spec/ruby/core/float/to_s_spec.rb b/spec/ruby/core/float/to_s_spec.rb new file mode 100644 index 0000000000..e76cfc1b7e --- /dev/null +++ b/spec/ruby/core/float/to_s_spec.rb @@ -0,0 +1,120 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "Float#to_s" do + it "returns 'NaN' for NaN" do + nan_value().to_s.should == 'NaN' + end + + it "returns 'Infinity' for positive infinity" do + infinity_value().to_s.should == 'Infinity' + end + + it "returns '-Infinity' for negative infinity" do + (-infinity_value()).to_s.should == '-Infinity' + end + + it "returns '0.0' for 0.0" do + 0.0.to_s.should == "0.0" + end + + platform_is_not :openbsd do + it "emits '-' for -0.0" do + -0.0.to_s.should == "-0.0" + end + end + + it "emits a '-' for negative values" do + -3.14.to_s.should == "-3.14" + end + + it "emits a trailing '.0' for a whole number" do + 50.0.to_s.should == "50.0" + end + + it "emits a trailing '.0' for the mantissa in e format" do + 1.0e20.to_s.should == "1.0e+20" + end + + it "uses non-e format for a positive value with fractional part having 5 significant figures" do + 0.0001.to_s.should == "0.0001" + end + + it "uses non-e format for a negative value with fractional part having 5 significant figures" do + -0.0001.to_s.should == "-0.0001" + end + + it "uses e format for a positive value with fractional part having 6 significant figures" do + 0.00001.to_s.should == "1.0e-05" + end + + it "uses e format for a negative value with fractional part having 6 significant figures" do + -0.00001.to_s.should == "-1.0e-05" + end + + it "uses non-e format for a positive value with whole part having 15 significant figures" do + 10000000000000.0.to_s.should == "10000000000000.0" + end + + it "uses non-e format for a negative value with whole part having 15 significant figures" do + -10000000000000.0.to_s.should == "-10000000000000.0" + end + + it "uses non-e format for a positive value with whole part having 16 significant figures" do + 100000000000000.0.to_s.should == "100000000000000.0" + end + + it "uses non-e format for a negative value with whole part having 16 significant figures" do + -100000000000000.0.to_s.should == "-100000000000000.0" + end + + it "uses e format for a positive value with whole part having 18 significant figures" do + 10000000000000000.0.to_s.should == "1.0e+16" + end + + it "uses e format for a negative value with whole part having 18 significant figures" do + -10000000000000000.0.to_s.should == "-1.0e+16" + end + + it "uses non-e format for a positive value with whole part having 17 significant figures" do + 1000000000000000.0.to_s.should == "1.0e+15" + end + + it "uses non-e format for a negative value with whole part having 17 significant figures" do + -1000000000000000.0.to_s.should == "-1.0e+15" + end + + # #3273 + it "outputs the minimal, unique form necessary to recreate the value" do + value = 0.21611564636388508 + string = "0.21611564636388508" + + value.to_s.should == string + string.to_f.should == value + end + + it "outputs the minimal, unique form to represent the value" do + 0.56.to_s.should == "0.56" + end +end + +with_feature :encoding do + describe "Float#to_s" do + before :each do + @internal = Encoding.default_internal + end + + after :each do + Encoding.default_internal = @internal + end + + it "returns a String in US-ASCII encoding when Encoding.default_internal is nil" do + Encoding.default_internal = nil + 1.23.to_s.encoding.should equal(Encoding::US_ASCII) + end + + it "returns a String in US-ASCII encoding when Encoding.default_internal is not nil" do + Encoding.default_internal = Encoding::IBM437 + 5.47.to_s.encoding.should equal(Encoding::US_ASCII) + end + end +end |