1 files changed, 34 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..79792c3169
--- /dev/null
+++ b/spec/ruby/core/complex/infinite_spec.rb
@@ -0,0 +1,34 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+ruby_version_is "2.4" do
+  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
+end