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Diffstat (limited to 'spec/ruby/core/string/to_c_spec.rb')
-rw-r--r-- | spec/ruby/core/string/to_c_spec.rb | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/spec/ruby/core/string/to_c_spec.rb b/spec/ruby/core/string/to_c_spec.rb new file mode 100644 index 0000000000..da353e18d5 --- /dev/null +++ b/spec/ruby/core/string/to_c_spec.rb @@ -0,0 +1,99 @@ +require File.expand_path('../../../spec_helper', __FILE__) + +describe "String#to_c" do + it "returns a Complex object" do + '9'.to_c.should be_an_instance_of(Complex) + end + + it "understands integers" do + '20'.to_c.should == Complex(20) + end + + it "understands negative integers" do + '-3'.to_c.should == Complex(-3) + end + + it "understands fractions (numerator/denominator) for the real part" do + '2/3'.to_c.should == Complex(Rational(2, 3)) + end + + it "understands fractions (numerator/denominator) for the imaginary part" do + '4+2/3i'.to_c.should == Complex(4, Rational(2, 3)) + end + + it "understands negative fractions (-numerator/denominator) for the real part" do + '-2/3'.to_c.should == Complex(Rational(-2, 3)) + end + + it "understands negative fractions (-numerator/denominator) for the imaginary part" do + '7-2/3i'.to_c.should == Complex(7, Rational(-2, 3)) + end + + it "understands floats (a.b) for the real part" do + '2.3'.to_c.should == Complex(2.3) + end + + it "understands floats (a.b) for the imaginary part" do + '4+2.3i'.to_c.should == Complex(4, 2.3) + end + + it "understands negative floats (-a.b) for the real part" do + '-2.33'.to_c.should == Complex(-2.33) + end + + it "understands negative floats (-a.b) for the imaginary part" do + '7-28.771i'.to_c.should == Complex(7, -28.771) + end + + it "understands an integer followed by 'i' to mean that integer is the imaginary part" do + '35i'.to_c.should == Complex(0,35) + end + + it "understands a negative integer followed by 'i' to mean that negative integer is the imaginary part" do + '-29i'.to_c.should == Complex(0,-29) + end + + it "understands an 'i' by itself as denoting a complex number with an imaginary part of 1" do + 'i'.to_c.should == Complex(0,1) + end + + it "understands a '-i' by itself as denoting a complex number with an imaginary part of -1" do + '-i'.to_c.should == Complex(0,-1) + end + + it "understands 'a+bi' to mean a complex number with 'a' as the real part, 'b' as the imaginary" do + '79+4i'.to_c.should == Complex(79,4) + end + + it "understands 'a-bi' to mean a complex number with 'a' as the real part, '-b' as the imaginary" do + '79-4i'.to_c.should == Complex(79,-4) + end + + it "understands scientific notation for the real part" do + '2e3+4i'.to_c.should == Complex(2e3,4) + end + + it "understands negative scientific notation for the real part" do + '-2e3+4i'.to_c.should == Complex(-2e3,4) + end + + it "understands scientific notation for the imaginary part" do + '4+2e3i'.to_c.should == Complex(4, 2e3) + end + + it "understands negative scientific notation for the imaginary part" do + '4-2e3i'.to_c.should == Complex(4, -2e3) + end + + it "understands scientific notation for the real and imaginary part in the same String" do + '2e3+2e4i'.to_c.should == Complex(2e3,2e4) + end + + it "understands negative scientific notation for the real and imaginary part in the same String" do + '-2e3-2e4i'.to_c.should == Complex(-2e3,-2e4) + end + + it "returns a complex number with 0 as the real part, 0 as the imaginary part for unrecognised Strings" do + 'ruby'.to_c.should == Complex(0,0) + end +end |