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Diffstat (limited to 'spec/ruby/core/math/sin_spec.rb')
-rw-r--r-- | spec/ruby/core/math/sin_spec.rb | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/spec/ruby/core/math/sin_spec.rb b/spec/ruby/core/math/sin_spec.rb new file mode 100644 index 0000000000..d8f134e609 --- /dev/null +++ b/spec/ruby/core/math/sin_spec.rb @@ -0,0 +1,39 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +# sine : (-Inf, Inf) --> (-1.0, 1.0) +describe "Math.sin" do + it "returns a float" do + Math.sin(Math::PI).should be_kind_of(Float) + end + + it "returns the sine of the argument expressed in radians" do + Math.sin(Math::PI).should be_close(0.0, TOLERANCE) + Math.sin(0).should be_close(0.0, TOLERANCE) + Math.sin(Math::PI/2).should be_close(1.0, TOLERANCE) + Math.sin(3*Math::PI/2).should be_close(-1.0, TOLERANCE) + Math.sin(2*Math::PI).should be_close(0.0, TOLERANCE) + end + + it "raises a TypeError if the argument cannot be coerced with Float()" do + lambda { Math.sin("test") }.should raise_error(TypeError) + end + + it "returns NaN given NaN" do + Math.sin(nan_value).nan?.should be_true + end + + it "raises a TypeError if the argument is nil" do + lambda { Math.sin(nil) }.should raise_error(TypeError) + end + + it "accepts any argument that can be coerced with Float()" do + Math.sin(MathSpecs::Float.new).should be_close(0.841470984807897, TOLERANCE) + end +end + +describe "Math#sin" do + it "is accessible as a private instance method" do + IncludesMath.new.send(:sin, 1.21).should be_close(0.935616001553386, TOLERANCE) + end +end |