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Diffstat (limited to 'spec/ruby/core/math/sqrt_spec.rb')
-rw-r--r-- | spec/ruby/core/math/sqrt_spec.rb | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/spec/ruby/core/math/sqrt_spec.rb b/spec/ruby/core/math/sqrt_spec.rb new file mode 100644 index 0000000000..03891b951a --- /dev/null +++ b/spec/ruby/core/math/sqrt_spec.rb @@ -0,0 +1,36 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Math.sqrt" do + it "returns a float" do + Math.sqrt(1).should be_kind_of(Float) + end + + it "returns the square root of the argument" do + Math.sqrt(1).should == 1.0 + Math.sqrt(4.0).should == 2.0 + Math.sqrt(15241578780673814.441547445).should be_close(123456789.123457, TOLERANCE) + end + + it "raises a TypeError if the argument cannot be coerced with Float()" do + lambda { Math.sqrt("test") }.should raise_error(TypeError) + end + + it "returns NaN given NaN" do + Math.sqrt(nan_value).nan?.should be_true + end + + it "raises a TypeError if the argument is nil" do + lambda { Math.sqrt(nil) }.should raise_error(TypeError) + end + + it "accepts any argument that can be coerced with Float()" do + Math.sqrt(MathSpecs::Float.new).should be_close(1.0, TOLERANCE) + end +end + +describe "Math#sqrt" do + it "is accessible as a private instance method" do + IncludesMath.new.send(:sqrt, 2.23).should be_close(1.49331845230681, TOLERANCE) + end +end |