Add specs for Range#reverse_each

Author: herwinw

core/range/reverse_each_spec.rb

@@ -0,0 +1,29 @@
+require_relative '../../spec_helper'
+
+ruby_version_is "3.3" do
+  describe "Range#reverse_each" do
+    it "works efficiently for very long Ranges of Integers" do
+      (1..2**100).reverse_each.take(3).size.should == 3
+    end
+
+    it "works for beginless Ranges of Integers" do
+      (..5).reverse_each.take(3).should == [5, 4, 3]
+    end
+
+    it "works for Ranges of Strings by converting the Range to an Array first" do
+      ("a".."z").reverse_each.take(3).should == ["z", "y", "x"]
+    end
+
+    it "raises a TypeError for endless Ranges of Integers" do
+      -> {
+        (1..).reverse_each.take(3)
+      }.should raise_error(TypeError, "can't iterate from NilClass")
+    end
+
+    it "raises a TypeError for endless Ranges of other objects" do
+      -> {
+        ("a"..).reverse_each.take(3)
+      }.should raise_error(TypeError, "can't iterate from NilClass")
+    end
+  end
+end