diff options
Diffstat (limited to 'spec/ruby/core/string/to_f_spec.rb')
| -rw-r--r-- | spec/ruby/core/string/to_f_spec.rb | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/spec/ruby/core/string/to_f_spec.rb b/spec/ruby/core/string/to_f_spec.rb new file mode 100644 index 0000000000..bb09e4f2f3 --- /dev/null +++ b/spec/ruby/core/string/to_f_spec.rb @@ -0,0 +1,140 @@ +require_relative '../../spec_helper' +require_relative 'fixtures/classes' + +# src.scan(/[+-]?[\d_]+\.[\d_]+(e[+-]?[\d_]+)?\b|[+-]?[\d_]+e[+-]?[\d_]+\b/i) + +describe "String#to_f" do + it "treats leading characters of self as a floating point number" do + "123.45e1".to_f.should == 1234.5 + "45.67 degrees".to_f.should == 45.67 + "0".to_f.should == 0.0 + + ".5".to_f.should == 0.5 + ".5e1".to_f.should == 5.0 + "5.".to_f.should == 5.0 + "5e".to_f.should == 5.0 + "5E".to_f.should == 5.0 + end + + it "treats special float value strings as characters" do + "NaN".to_f.should == 0 + "Infinity".to_f.should == 0 + "-Infinity".to_f.should == 0 + end + + it "allows for varying case" do + "123.45e1".to_f.should == 1234.5 + "123.45E1".to_f.should == 1234.5 + end + + it "allows for varying signs" do + "+123.45e1".to_f.should == +123.45e1 + "-123.45e1".to_f.should == -123.45e1 + "123.45e+1".to_f.should == 123.45e+1 + "123.45e-1".to_f.should == 123.45e-1 + "+123.45e+1".to_f.should == +123.45e+1 + "+123.45e-1".to_f.should == +123.45e-1 + "-123.45e+1".to_f.should == -123.45e+1 + "-123.45e-1".to_f.should == -123.45e-1 + end + + it "allows for underscores, even in the decimal side" do + "1_234_567.890_1".to_f.should == 1_234_567.890_1 + end + + it "returns 0 for strings with leading underscores" do + "_9".to_f.should == 0 + end + + it "stops if the underscore is not followed or preceded by a number" do + "1__2".to_f.should == 1.0 + "1_.2".to_f.should == 1.0 + "1._2".to_f.should == 1.0 + "1.2_e2".to_f.should == 1.2 + "1.2e_2".to_f.should == 1.2 + "1_x2".to_f.should == 1.0 + "1x_2".to_f.should == 1.0 + "+_1".to_f.should == 0.0 + "-_1".to_f.should == 0.0 + end + + it "does not allow prefixes to autodetect the base" do + "0b10".to_f.should == 0 + "010".to_f.should == 10 + "0o10".to_f.should == 0 + "0d10".to_f.should == 0 + "0x10".to_f.should == 0 + end + + it "treats any non-numeric character other than '.', 'e' and '_' as terminals" do + "blah".to_f.should == 0 + "1b5".to_f.should == 1 + "1d5".to_f.should == 1 + "1o5".to_f.should == 1 + "1xx5".to_f.should == 1 + "x5".to_f.should == 0 + end + + it "takes an optional sign" do + "-45.67 degrees".to_f.should == -45.67 + "+45.67 degrees".to_f.should == 45.67 + "-5_5e-5_0".to_f.should == -55e-50 + "-".to_f.should == 0.0 + (1.0 / "-0".to_f).to_s.should == "-Infinity" + end + + it "treats a second 'e' as terminal" do + "1.234e1e2".to_f.should == 1.234e1 + end + + it "treats a second '.' as terminal" do + "1.2.3".to_f.should == 1.2 + end + + it "treats a '.' after an 'e' as terminal" do + "1.234e1.9".to_f.should == 1.234e1 + end + + it "returns 0.0 if the conversion fails" do + "bad".to_f.should == 0.0 + "thx1138".to_f.should == 0.0 + end + + it "ignores leading and trailing whitespace" do + " 1.2".to_f.should == 1.2 + "1.2 ".to_f.should == 1.2 + " 1.2 ".to_f.should == 1.2 + "\t1.2".to_f.should == 1.2 + "\n1.2".to_f.should == 1.2 + "\v1.2".to_f.should == 1.2 + "\f1.2".to_f.should == 1.2 + "\r1.2".to_f.should == 1.2 + end + + it "treats non-printable ASCII characters as terminals" do + "\0001.2".to_f.should == 0 + "\0011.2".to_f.should == 0 + "\0371.2".to_f.should == 0 + "\1771.2".to_f.should == 0 + "\2001.2".b.to_f.should == 0 + "\3771.2".b.to_f.should == 0 + end + + it "raises Encoding::CompatibilityError if String is in not ASCII-compatible encoding" do + -> { + '1.2'.encode("UTF-16").to_f + }.should.raise(Encoding::CompatibilityError, "ASCII incompatible encoding: UTF-16") + end + + it "allows String representation without a fractional part" do + "1.".to_f.should == 1.0 + "+1.".to_f.should == 1.0 + "-1.".to_f.should == -1.0 + "1.e+0".to_f.should == 1.0 + "1.e+0".to_f.should == 1.0 + + ruby_bug "#20705", ""..."3.4" do + "1.e-2".to_f.should be_close(0.01, TOLERANCE) + end + end +end |