add specs for files_upload_v2

Author: gregsaab

spec/fixtures/slack/web/files_upload_v2.yml

@@ -0,0 +1,44 @@
+require 'spec_helper'
+
+RSpec.describe Slack::Web::Api::Endpoints::Files do
+  let(:client) { Slack::Web::Client.new }
+  let(:valid_params) do
+    { filename: 'test.txt', content: 'Test File Contents', channels: 'C08AZ76CA4V' }
+  end
+
+  context 'when filename is missing from options' do
+    before do
+      valid_params.delete(:filename)
+    end
+
+    it 'throws argument error' do
+      expect { client.files_upload_v2(valid_params) }.to raise_error ArgumentError
+    end
+  end
+
+  context 'when channels is missing from options' do
+    before do
+      valid_params.delete(:channels)
+    end
+
+    it 'throws argument error' do
+      expect { client.files_upload_v2(valid_params) }.to raise_error ArgumentError
+    end
+  end
+
+  context 'when content is missing from options' do
+    before do
+      valid_params.delete(:content)
+    end
+
+    it 'throws argument error' do
+      expect { client.files_upload_v2(valid_params) }.to raise_error ArgumentError
+    end
+  end
+
+  context 'when all required options are sent', vcr: { cassette_name: 'web/files_upload_v2' } do
+    it 'completes the upload' do
+      client.files_upload_v2(valid_params)
+    end
+  end
+end