1 files changed, 38 insertions, 0 deletions
diff --git a/spec/ruby/core/float/arg_spec.rb b/spec/ruby/core/float/arg_spec.rb
new file mode 100644
index 0000000000..c9c602bbf6
--- /dev/null
+++ b/spec/ruby/core/float/arg_spec.rb
@@ -0,0 +1,38 @@
+require_relative '../../spec_helper'
+
+describe "Float#arg" do
+  it "returns NaN if NaN" do
+    f = nan_value
+    f.arg.nan?.should == true
+  end
+
+  it "returns self if NaN" do
+    f = nan_value
+    f.arg.should.equal?(f)
+  end
+
+  it "returns 0 if positive" do
+    1.0.arg.should == 0
+  end
+
+  it "returns 0 if +0.0" do
+    0.0.arg.should == 0
+  end
+
+  it "returns 0 if +Infinity" do
+    infinity_value.arg.should == 0
+  end
+
+  it "returns Pi if negative" do
+    (-1.0).arg.should == Math::PI
+  end
+
+  # This was established in r23960
+  it "returns Pi if -0.0" do
+    (-0.0).arg.should == Math::PI
+  end
+
+  it "returns Pi if -Infinity" do
+    (-infinity_value).arg.should == Math::PI
+  end
+end