Add test and history note for ParamsArray payload.

history.md

@@ -17,6 +17,10 @@
 - The previous fix to avoid having Netrc username/password override an
   Authorization header was case-sensitive and incomplete. Fix this by
   respecting existing Authorization headers, regardless of letter case. (#550)
+- Handle ParamsArray payloads. Previously, rest-client would silently drop a
+  ParamsArray passed as the payload. Instead, automatically use
+  Payload::Multipart if the ParamsArray contains a file handle, or use
+  Payload::UrlEncoded if it doesn't. (#508)
 
 # 2.0.2
 

spec/unit/payload_spec.rb

@@ -265,5 +265,10 @@ Content-Type: text/plain\r
       params = RestClient::ParamsArray.new([[:image, f]])
       expect(RestClient::Payload.generate(params)).to be_kind_of(RestClient::Payload::Multipart)
     end
+
+    it "should handle non-multipart payload wrapped in ParamsArray" do
+      params = RestClient::ParamsArray.new([[:arg, 'value1'], [:arg, 'value2']])
+      expect(RestClient::Payload.generate(params)).to be_kind_of(RestClient::Payload::UrlEncoded)
+    end
   end
 end