1 files changed, 32 insertions, 0 deletions
diff --git a/spec/ruby/core/complex/infinite_spec.rb b/spec/ruby/core/complex/infinite_spec.rb
new file mode 100644
index 0000000000..9e48860dee
--- /dev/null
+++ b/spec/ruby/core/complex/infinite_spec.rb
@@ -0,0 +1,32 @@
+require_relative '../../spec_helper'
+
+describe "Complex#infinite?" do
+  it "returns nil if magnitude is finite" do
+    (1+1i).infinite?.should == nil
+  end
+
+  it "returns 1 for positive infinity" do
+    value = Complex(Float::INFINITY, 42).infinite?
+    value.should == 1
+  end
+
+  it "returns 1 for positive complex with infinite imaginary" do
+    value = Complex(1, Float::INFINITY).infinite?
+    value.should == 1
+  end
+
+  it "returns -1 for negative infinity" do
+    value = -Complex(Float::INFINITY, 42).infinite?
+    value.should == -1
+  end
+
+  it "returns -1 for negative complex with infinite imaginary" do
+    value = -Complex(1, Float::INFINITY).infinite?
+    value.should == -1
+  end
+
+  it "returns nil for NaN" do
+    value = Complex(0, Float::NAN).infinite?
+    value.should == nil
+  end
+end