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-rw-r--r--spec/ruby/core/math/sin_spec.rb39
1 files changed, 39 insertions, 0 deletions
diff --git a/spec/ruby/core/math/sin_spec.rb b/spec/ruby/core/math/sin_spec.rb
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+++ b/spec/ruby/core/math/sin_spec.rb
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+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../fixtures/classes', __FILE__)
+
+# sine : (-Inf, Inf) --> (-1.0, 1.0)
+describe "Math.sin" do
+ it "returns a float" do
+ Math.sin(Math::PI).should be_kind_of(Float)
+ end
+
+ it "returns the sine of the argument expressed in radians" do
+ Math.sin(Math::PI).should be_close(0.0, TOLERANCE)
+ Math.sin(0).should be_close(0.0, TOLERANCE)
+ Math.sin(Math::PI/2).should be_close(1.0, TOLERANCE)
+ Math.sin(3*Math::PI/2).should be_close(-1.0, TOLERANCE)
+ Math.sin(2*Math::PI).should be_close(0.0, TOLERANCE)
+ end
+
+ it "raises a TypeError if the argument cannot be coerced with Float()" do
+ lambda { Math.sin("test") }.should raise_error(TypeError)
+ end
+
+ it "returns NaN given NaN" do
+ Math.sin(nan_value).nan?.should be_true
+ end
+
+ it "raises a TypeError if the argument is nil" do
+ lambda { Math.sin(nil) }.should raise_error(TypeError)
+ end
+
+ it "accepts any argument that can be coerced with Float()" do
+ Math.sin(MathSpecs::Float.new).should be_close(0.841470984807897, TOLERANCE)
+ end
+end
+
+describe "Math#sin" do
+ it "is accessible as a private instance method" do
+ IncludesMath.new.send(:sin, 1.21).should be_close(0.935616001553386, TOLERANCE)
+ end
+end