Regression tests for JRUBY-5275 and JRUBY-5302.

spec/regression/JRUBY-5275_each_slice_failures_spec.rb

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+describe "Enumerator\#each_slice" do
+  describe "when called with no block" do
+    describe "and .first" do
+      it "returns the first slice" do
+        [0, 1, 2, 3].each_slice(2).first.should == [0, 1]
+      end
+    end
+
+    describe "and .to_a" do
+      it "returns the slices in an array" do
+        [0, 1, 2, 3].each_slice(2).to_a.should == [[0, 1], [2, 3]]
+      end
+    end
+
+    describe "and .map{}" do
+      it "yields the slices and produces mapped result" do
+        [0, 1, 2, 3].each_slice(2).map{|a, b| [a, b]}.should == [[0, 1], [2, 3]]
+      end
+    end
+  end
+
+  describe "called with a block" do
+    describe "with n arguments" do
+      it "yields the slice arrays' elements" do
+        ary = []
+        [0, 1, 2, 3].each_slice(2) {|a, b| ary << [a, b]}
+        ary.should == [[0, 1], [2, 3]]
+      end
+    end
+  end
+end

spec/regression/JRUBY-5302.rb

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+describe "A Hash" do
+  it "yields k, v to a map() block receiving k, v" do
+    hash = {1 => 2}
+    mapped = hash.map {|k, v| "#{k} #{v}"}
+    mapped.should == ["1 2"]
+  end
+end