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* For easier modifications of ruby/spec by MRI developers. * .gitignore: track changes under spec. * spec/mspec, spec/rubyspec: add in-tree mspec and ruby/spec. These files can therefore be updated like any other file in MRI. Instructions are provided in spec/README. [Feature #13156] [ruby-core:79246] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58595 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
50 lines
1.6 KiB
Ruby
50 lines
1.6 KiB
Ruby
require File.expand_path('../../../spec_helper', __FILE__)
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require File.expand_path('../fixtures/classes', __FILE__)
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# arcsine : (-1.0, 1.0) --> (-PI/2, PI/2)
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describe "Math.asin" do
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it "returns a float" do
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Math.asin(1).should be_kind_of(Float)
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end
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it "returns the arcsine of the argument" do
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Math.asin(1).should be_close(Math::PI/2, TOLERANCE)
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Math.asin(0).should be_close(0.0, TOLERANCE)
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Math.asin(-1).should be_close(-Math::PI/2, TOLERANCE)
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Math.asin(0.25).should be_close(0.252680255142079, TOLERANCE)
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Math.asin(0.50).should be_close(0.523598775598299, TOLERANCE)
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Math.asin(0.75).should be_close(0.8480620789814816,TOLERANCE)
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end
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conflicts_with :Complex do
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it "raises an Errno::EDOM if the argument is greater than 1.0" do
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lambda { Math.asin(1.0001) }.should raise_error( Errno::EDOM)
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end
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it "raises an Errno::EDOM if the argument is less than -1.0" do
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lambda { Math.asin(-1.0001) }.should raise_error( Errno::EDOM)
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end
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end
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it "raises a TypeError if the argument cannot be coerced with Float()" do
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lambda { Math.asin("test") }.should raise_error(TypeError)
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end
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it "returns NaN given NaN" do
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Math.asin(nan_value).nan?.should be_true
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end
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it "raises a TypeError if the argument is nil" do
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lambda { Math.asin(nil) }.should raise_error(TypeError)
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end
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it "accepts any argument that can be coerced with Float()" do
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Math.asin(MathSpecs::Float.new).should be_close(1.5707963267949, TOLERANCE)
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end
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end
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describe "Math#asin" do
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it "is accessible as a private instance method" do
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IncludesMath.new.send(:asin, 0.5).should be_close(0.523598775598299, TOLERANCE)
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end
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end
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