1 files changed, 41 insertions, 0 deletions

diff --git a/spec/ruby/core/complex/polar_spec.rb b/spec/ruby/core/complex/polar_spec.rb
new file mode 100644
index 0000000000..824211fcd0
--- /dev/null
+++ b/spec/ruby/core/complex/polar_spec.rb
@@ -0,0 +1,41 @@
+require_relative '../../spec_helper'
+
+describe "Complex.polar" do
+  it "returns a complex number in terms of radius and angle" do
+    Complex.polar(50, 60).should be_close(Complex(-47.6206490207578, -15.2405310551108), TOLERANCE)
+    Complex.polar(-10, -20).should be_close(Complex(-4.08082061813392, 9.12945250727628), TOLERANCE)
+  end
+
+  it "raises a TypeError when given non real arguments" do
+    ->{ Complex.polar(nil)      }.should.raise(TypeError)
+    ->{ Complex.polar(nil, nil) }.should.raise(TypeError)
+  end
+
+  it "computes the real values of the real & imaginary parts from the polar form" do
+    a = Complex.polar(1.0+0.0i, Math::PI/2+0.0i)
+    a.real.should be_close(0.0, TOLERANCE)
+    a.imag.should be_close(1.0, TOLERANCE)
+    a.real.real?.should == true
+    a.imag.real?.should == true
+
+    b = Complex.polar(1+0.0i)
+    b.real.should be_close(1.0, TOLERANCE)
+    b.imag.should be_close(0.0, TOLERANCE)
+    b.real.real?.should == true
+    b.imag.real?.should == true
+  end
+end
+
+describe "Complex#polar" do
+  it "returns the absolute value and the argument" do
+    a = Complex(3, 4)
+    a.polar.size.should == 2
+    a.polar.first.should == 5.0
+    a.polar.last.should be_close(0.927295218001612, TOLERANCE)
+
+    b = Complex(-3.5, 4.7)
+    b.polar.size.should == 2
+    b.polar.first.should be_close(5.86003412959345, TOLERANCE)
+    b.polar.last.should be_close(2.21088447955664, TOLERANCE)
+  end
+end