1 files changed, 30 insertions, 0 deletions
diff --git a/spec/ruby/library/cmath/math/shared/sin.rb b/spec/ruby/library/cmath/math/shared/sin.rb
new file mode 100644
index 0000000000..1cb1b29cda
--- /dev/null
+++ b/spec/ruby/library/cmath/math/shared/sin.rb
@@ -0,0 +1,30 @@
+require_relative '../fixtures/classes'
+
+describe :complex_math_sin, shared: true do
+  it "returns the sine of the passed argument expressed in radians" do
+    @object.send(:sin, CMath::PI).should be_close(0.0, TOLERANCE)
+    @object.send(:sin, 0).should be_close(0.0, TOLERANCE)
+    @object.send(:sin, CMath::PI/2).should be_close(1.0, TOLERANCE)
+    @object.send(:sin, 3*Math::PI/2).should be_close(-1.0, TOLERANCE)
+    @object.send(:sin, 2*Math::PI).should be_close(0.0, TOLERANCE)
+  end
+
+  it "returns the sine for Complex numbers" do
+    @object.send(:sin, Complex(0, CMath::PI)).should be_close(Complex(0.0, 11.5487393572577), TOLERANCE)
+    @object.send(:sin, Complex(3, 4)).should be_close(Complex(3.85373803791938, -27.0168132580039), TOLERANCE)
+  end
+end
+
+describe :complex_math_sin_bang, shared: true do
+  it "returns the sine of the passed argument expressed in radians" do
+    @object.send(:sin!, CMath::PI).should be_close(0.0, TOLERANCE)
+    @object.send(:sin!, 0).should be_close(0.0, TOLERANCE)
+    @object.send(:sin!, CMath::PI/2).should be_close(1.0, TOLERANCE)
+    @object.send(:sin!, 3*Math::PI/2).should be_close(-1.0, TOLERANCE)
+    @object.send(:sin!, 2*Math::PI).should be_close(0.0, TOLERANCE)
+  end
+
+  it "raises a TypeError when passed a Complex number" do
+    -> { @object.send(:sin!, Complex(4, 5)) }.should raise_error(TypeError)
+  end
+end