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Diffstat (limited to 'spec/ruby/core/math/asin_spec.rb')
-rw-r--r-- | spec/ruby/core/math/asin_spec.rb | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/spec/ruby/core/math/asin_spec.rb b/spec/ruby/core/math/asin_spec.rb new file mode 100644 index 0000000000..ef3426bceb --- /dev/null +++ b/spec/ruby/core/math/asin_spec.rb @@ -0,0 +1,50 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +# arcsine : (-1.0, 1.0) --> (-PI/2, PI/2) +describe "Math.asin" do + it "returns a float" do + Math.asin(1).should be_kind_of(Float) + end + + it "returns the arcsine of the argument" do + Math.asin(1).should be_close(Math::PI/2, TOLERANCE) + Math.asin(0).should be_close(0.0, TOLERANCE) + Math.asin(-1).should be_close(-Math::PI/2, TOLERANCE) + Math.asin(0.25).should be_close(0.252680255142079, TOLERANCE) + Math.asin(0.50).should be_close(0.523598775598299, TOLERANCE) + Math.asin(0.75).should be_close(0.8480620789814816,TOLERANCE) + end + + conflicts_with :Complex do + it "raises an Errno::EDOM if the argument is greater than 1.0" do + lambda { Math.asin(1.0001) }.should raise_error( Errno::EDOM) + end + + it "raises an Errno::EDOM if the argument is less than -1.0" do + lambda { Math.asin(-1.0001) }.should raise_error( Errno::EDOM) + end + end + + it "raises a TypeError if the argument cannot be coerced with Float()" do + lambda { Math.asin("test") }.should raise_error(TypeError) + end + + it "returns NaN given NaN" do + Math.asin(nan_value).nan?.should be_true + end + + it "raises a TypeError if the argument is nil" do + lambda { Math.asin(nil) }.should raise_error(TypeError) + end + + it "accepts any argument that can be coerced with Float()" do + Math.asin(MathSpecs::Float.new).should be_close(1.5707963267949, TOLERANCE) + end +end + +describe "Math#asin" do + it "is accessible as a private instance method" do + IncludesMath.new.send(:asin, 0.5).should be_close(0.523598775598299, TOLERANCE) + end +end |