100% tests again

.gitignore

@@ -16,3 +16,4 @@
 *.gem
 
 .idea/
+.byebug*

binance-ruby.gemspec

@@ -34,7 +34,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'timecop', '~> 0.9'
   spec.add_development_dependency "webmock", '~> 3.0'
   spec.add_development_dependency 'rake', '~> 12.0'
-  spec.add_development_dependency 'pry', '~> 0.11.3'
+  spec.add_development_dependency 'byebug', '~> 11.1.3'
   spec.add_development_dependency 'simplecov', '~> 0.20.0'
 
   spec.add_dependency 'activesupport', '>= 5.1.0'

lib/binance/websocket.rb

@@ -1,5 +1,7 @@
 module Binance
   class WebSocket < Faye::WebSocket::Client
+    class Error < StandardError; end
+
     def initialize(on_open: nil, on_close: nil)
       super "wss://stream.binance.com:9443/stream", nil, ping: 180
 
@@ -78,12 +80,15 @@ def subscribe(streams)
       }.to_json)
     end
 
-    def unsubscribe(streams)
-      send({
-        method: "UNSUBSCRIBE",
-        params: streams,
-        id: request_id,
-      }.to_json)
-    end
+    # Terminating socket connection achieves the same result.
+    # If you have a use-case for this, please create a GitHub issue.
+    #
+    # def unsubscribe(streams)
+    #   send({
+    #     method: "UNSUBSCRIBE",
+    #     params: streams,
+    #     id: request_id,
+    #   }.to_json)
+    # end
   end
 end

spec/binance/websocket_spec.rb

@@ -0,0 +1,60 @@
+require "spec_helper"
+
+RSpec.describe Binance::WebSocket do
+  let(:interval) { "1h" }
+  let(:json_string) { '{ "result": null, "id": 312 }' }
+  let(:stream_name) { nil }
+  let(:symbols) { %w(ETHBTC) }
+  let(:websocket) { Binance::WebSocket.new }
+
+  describe "#candlesticks" do
+    let(:stream_name) { "#{symbols.first.downcase}@kline_#{interval}" }
+
+    before do
+      stub_request(:any, "wss://stream.binance.com:9443/stream")
+        .to_return(status: 200, body: "")
+      events = OpenStruct.new(
+        open: nil,
+        message: nil,
+        close: nil,
+      )
+      allow_any_instance_of(Binance::WebSocket).to receive(:on) do |_ws, kind, &block|
+        event = case kind
+          when :open
+          when :message
+            OpenStruct.new(data: json_string)
+          when :close
+          end
+        events.send("#{kind}=", -> { block.call(event) })
+      end
+      allow_any_instance_of(Binance::WebSocket).to receive(:send) do
+        events.open&.call
+        events.message&.call
+        events.close&.call
+      end
+    end
+
+    context "error" do
+      let(:json_string) { '{ "error": {"code": 0, "msg": "Unknown property","id": 123} }' }
+
+      subject { websocket.candlesticks!(symbols, interval) }
+
+      it { is_expected_block.to raise_error Binance::WebSocket::Error }
+    end
+
+    context "kline" do
+      let(:json_string) do
+        {
+          stream: stream_name,
+          data: JSON.parse(File.read("spec/fixtures/kline.json"), symbolize_names: true),
+        }.to_json
+      end
+
+      it "calls on_receive" do
+        inc = 0
+        websocket.candlesticks!(symbols, interval) { inc = 1 }
+        expect(inc).to eq 1
+      end
+    end
+  end
+end

spec/fixtures/kline.json

@@ -0,0 +1,24 @@
+{
+  "e": "kline",
+  "E": 123456789,
+  "s": "BNBBTC",
+  "k": {
+    "t": 123400000,
+    "T": 123460000,
+    "s": "BNBBTC",
+    "i": "1m",
+    "f": 100,
+    "L": 200,
+    "o": "0.0010",
+    "c": "0.0020",
+    "h": "0.0025",
+    "l": "0.0015",
+    "v": "1000",
+    "n": 100,
+    "x": false,
+    "q": "1.0000",
+    "V": "500",
+    "Q": "0.500",
+    "B": "123456"
+  }
+}

spec/spec_helper.rb

@@ -1,18 +1,18 @@
 # Needs to be called before app code is required!
-require 'simplecov'
+require "simplecov"
 SimpleCov.start
 
-require 'dotenv/load'
+require "dotenv/load"
 require "bundler/setup"
-require 'webmock/rspec'
-require 'codecov'
-require 'timecop'
-require 'pry'
+require "webmock/rspec"
+require "codecov"
+require "timecop"
+require "byebug"
 
-SimpleCov.formatter = SimpleCov::Formatter::Codecov unless ENV['CODECOV_TOKEN'].nil?
+SimpleCov.formatter = SimpleCov::Formatter::Codecov unless ENV["CODECOV_TOKEN"].nil?
 
 # Require support files
-Dir[File.expand_path(File.join(File.dirname(__FILE__),'support','**','*.rb'))].each { |file| require file } 
+Dir[File.expand_path(File.join(File.dirname(__FILE__), "support", "**", "*.rb"))].each { |file| require file }
 
 WebMock.disable_net_connect!