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Diffstat (limited to 'spec/ruby/core/math/ldexp_spec.rb')
-rw-r--r-- | spec/ruby/core/math/ldexp_spec.rb | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/spec/ruby/core/math/ldexp_spec.rb b/spec/ruby/core/math/ldexp_spec.rb new file mode 100644 index 0000000000..360f5c5e2a --- /dev/null +++ b/spec/ruby/core/math/ldexp_spec.rb @@ -0,0 +1,54 @@ +require File.expand_path('../../../spec_helper', __FILE__) +require File.expand_path('../fixtures/classes', __FILE__) + +describe "Math.ldexp" do + it "returns a float" do + Math.ldexp(1.0, 2).should be_kind_of(Float) + end + + it "returns the argument multiplied by 2**n" do + Math.ldexp(0.0, 0.0).should == 0.0 + Math.ldexp(0.0, 1.0).should == 0.0 + Math.ldexp(-1.25, 2).should be_close(-5.0, TOLERANCE) + Math.ldexp(2.1, -3).should be_close(0.2625, TOLERANCE) + Math.ldexp(5.7, 4).should be_close(91.2, TOLERANCE) + end + + it "raises a TypeError if the first argument cannot be coerced with Float()" do + lambda { Math.ldexp("test", 2) }.should raise_error(TypeError) + end + + it "returns NaN given NaN" do + Math.ldexp(nan_value, 0).nan?.should be_true + end + + it "raises RangeError if NaN is given as the second arg" do + lambda { Math.ldexp(0, nan_value) }.should raise_error(RangeError) + end + + it "raises a TypeError if the second argument cannot be coerced with Integer()" do + lambda { Math.ldexp(3.2, "this") }.should raise_error(TypeError) + end + + it "raises a TypeError if the first argument is nil" do + lambda { Math.ldexp(nil, 2) }.should raise_error(TypeError) + end + + it "raises a TypeError if the second argument is nil" do + lambda { Math.ldexp(3.1, nil) }.should raise_error(TypeError) + end + + it "accepts any first argument that can be coerced with Float()" do + Math.ldexp(MathSpecs::Float.new, 2).should be_close(4.0, TOLERANCE) + end + + it "accepts any second argument that can be coerced with Integer()" do + Math.ldexp(3.23, MathSpecs::Integer.new).should be_close(12.92, TOLERANCE) + end +end + +describe "Math#ldexp" do + it "is accessible as a private instance method" do + IncludesMath.new.send(:ldexp, 3.1415, 2).should be_close(12.566, TOLERANCE) + end +end |