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43 lines
1.3 KiB
Ruby
43 lines
1.3 KiB
Ruby
require_relative '../../spec_helper'
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require_relative 'fixtures/classes'
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# The common logarithm, having base 10
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describe "Math.log10" do
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it "returns a float" do
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Math.log10(1).should be_kind_of(Float)
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end
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it "returns the base-10 logarithm of the argument" do
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Math.log10(0.0001).should be_close(-4.0, TOLERANCE)
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Math.log10(0.000000000001e-15).should be_close(-27.0, TOLERANCE)
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Math.log10(1).should be_close(0.0, TOLERANCE)
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Math.log10(10).should be_close(1.0, TOLERANCE)
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Math.log10(10e15).should be_close(16.0, TOLERANCE)
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end
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it "raises an Math::DomainError if the argument is less than 0" do
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-> { Math.log10(-1e-15) }.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.log10("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.log10(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.log10(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.log10(MathSpecs::Float.new).should be_close(0.0, TOLERANCE)
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end
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end
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describe "Math#log10" do
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it "is accessible as a private instance method" do
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IncludesMath.new.send(:log10, 4.15).should be_close(0.618048096712093, TOLERANCE)
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end
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end
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