Modified to allow only string as example doc string

lib/rspec/core/example_group.rb

@@ -144,17 +144,14 @@ def described_class
       #
       def self.define_example_method(name, extra_options={})
         idempotently_define_singleton_method(name) do |*all_args, &block|
-          desc, *args = *all_args
+          description = all_args.shift if all_args.first.is_a? String
+          metadata = all_args
 
-          unless NilClass === desc || String === desc
-            RSpec.warning "`#{desc.inspect}` is used as example doc string. Use a string instead"
-          end
-
-          options = Metadata.build_hash_from(args)
+          options = Metadata.build_hash_from(metadata)
           options.update(:skip => RSpec::Core::Pending::NOT_YET_IMPLEMENTED) unless block
           options.update(extra_options)
 
-          RSpec::Core::Example.new(self, desc, options, block)
+          RSpec::Core::Example.new(self, description, options, block)
         end
       end
 

spec/rspec/core/example_group_spec.rb

@@ -1263,39 +1263,43 @@ def extract_execution_results(group)
       end
     end
 
-    describe "example doc string" do
-      let(:group) { RSpec.describe }
-
-      it "accepts a string for an example doc string" do
-        expect { group.it('MyClass') { } }.not_to output.to_stderr
-      end
+    describe "example doc string and metadata" do
+      context "when first argument of example is a string" do
+        it "returns the string as description" do
+          example = RSpec.describe.it("my example")
+          expect(example.metadata[:description]).to eq("my example")
+        end
 
-      it "accepts example without a doc string" do
-        expect { group.it { } }.not_to output.to_stderr
-      end
+        it "returns the string as description and symbol is set in metadata" do
+          example = RSpec.describe.it("my example", :foo)
+          expect(example.metadata[:description]).to eq("my example")
+          expect(example.metadata[:foo]).to be_truthy
+        end
 
-      it "emits a warning when a Class is used as an example doc string" do
-        expect { group.it(Numeric) { } }
-          .to output(/`Numeric` is used as example doc string. Use a string instead/)
-          .to_stderr
+        it "returns the string as description and hash is set in metadata" do
+          example = RSpec.describe.it("my example", { "foo" => "bar" })
+          expect(example.metadata[:description]).to eq("my example")
+          expect(example.metadata["foo"]).to eq("bar")
+        end
       end
 
-      it "emits a warning when a Module is used as an example doc string" do
-        expect { group.it(RSpec) { } }
-          .to output(/`RSpec` is used as example doc string. Use a string instead/)
-          .to_stderr
-      end
+      context "when first argument of example is NOT a string" do
+        it "returns empty string as description" do
+          example = RSpec.describe.it
+          expect(example.metadata[:description]).to be_empty
+        end
 
-      it "emits a warning when a Symbol is used as an example doc string" do
-        expect { group.it(:foo) { } }
-          .to output(/`:foo` is used as example doc string. Use a string instead/)
-          .to_stderr
-      end
+        it "returns empty string as description and symbol is set in metadata" do
+          example = RSpec.describe.it(:foo)
+          expect(example.metadata[:description]).to be_empty
+          expect(example.metadata[:foo]).to be_truthy
+        end
 
-      it "emits a warning when a Hash is used as an example doc string" do
-        expect { group.it(foo: :bar) { } }
-          .to output(/`{:foo=>:bar}` is used as example doc string. Use a string instead/)
-          .to_stderr
+        it "returns empty string as description and hash is set in metadata" do
+          example = RSpec.describe.it({ "foo" => "bar" })
+          expect(example.metadata[:description]).to be_empty
+          expect(example.metadata["foo"]).to eq("bar")
+        end
       end
     end