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48 lines
1.6 KiB
Ruby
48 lines
1.6 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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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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it "raises an Math::DomainError if the argument is greater than 1.0" do
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-> { Math.asin(1.0001) }.should raise_error( Math::DomainError)
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end
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it "raises an Math::DomainError if the argument is less than -1.0" do
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-> { Math.asin(-1.0001) }.should raise_error( Math::DomainError)
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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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-> { 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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-> { 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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