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Diffstat (limited to 'spec/ruby/core/math/acos_spec.rb')
-rw-r--r-- | spec/ruby/core/math/acos_spec.rb | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/spec/ruby/core/math/acos_spec.rb b/spec/ruby/core/math/acos_spec.rb new file mode 100644 index 0000000000..b0fd9baa91 --- /dev/null +++ b/spec/ruby/core/math/acos_spec.rb @@ -0,0 +1,58 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +# arccosine : (-1.0, 1.0) --> (0, PI) +describe "Math.acos" do + before :each do + ScratchPad.clear + end + + it "returns a float" do + Math.acos(1).should be_kind_of(Float ) + end + + it "returns the arccosine of the argument" do + Math.acos(1).should be_close(0.0, TOLERANCE) + Math.acos(0).should be_close(1.5707963267949, TOLERANCE) + Math.acos(-1).should be_close(Math::PI,TOLERANCE) + Math.acos(0.25).should be_close(1.31811607165282, TOLERANCE) + Math.acos(0.50).should be_close(1.0471975511966 , TOLERANCE) + Math.acos(0.75).should be_close(0.722734247813416, TOLERANCE) + end + + conflicts_with :Complex do + it "raises an Errno::EDOM if the argument is greater than 1.0" do + lambda { Math.acos(1.0001) }.should raise_error(Errno::EDOM) + end + + it "raises an Errno::EDOM if the argument is less than -1.0" do + lambda { Math.acos(-1.0001) }.should raise_error(Errno::EDOM) + end + end + + it "raises a TypeError if the string argument cannot be coerced with Float()" do + lambda { Math.acos("test") }.should raise_error(TypeError) + end + + it "returns NaN given NaN" do + Math.acos(nan_value).nan?.should be_true + end + + it "raises a TypeError if the argument cannot be coerced with Float()" do + lambda { Math.acos(MathSpecs::UserClass.new) }.should raise_error(TypeError) + end + + it "raises a TypeError if the argument is nil" do + lambda { Math.acos(nil) }.should raise_error(TypeError) + end + + it "accepts any argument that can be coerced with Float()" do + Math.acos(MathSpecs::Float.new(0.5)).should be_close(Math.acos(0.5), TOLERANCE) + end +end + +describe "Math#acos" do + it "is accessible as a private instance method" do + IncludesMath.new.send(:acos, 0).should be_close(1.5707963267949, TOLERANCE) + end +end |