Write Numeric#negative? specs

Author: kachick

core/numeric/negative_spec.rb

@@ -0,0 +1,26 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+
+ruby_version_is "2.3" do
+  describe "Numeric#negative?" do
+    describe "on positive numbers" do
+      it "returns false" do
+        1.negative?.should be_false
+        0.1.negative?.should be_false
+      end
+    end
+    
+    describe "on zero" do
+      it "returns false" do
+        0.negative?.should be_false
+        0.0.negative?.should be_false
+      end
+    end
+    
+    describe "on negative numbers" do
+      it "returns true" do
+        -1.negative?.should be_true
+        -0.1.negative?.should be_true
+      end
+    end
+  end
+end