Add a spec for Github::Client and revert an `if !` to `unless`

Signed-off-by: Rémy Coutable <remy@rymai.me>

lib/github/import.rb

@@ -236,7 +236,7 @@ module Github
         # for both features, like manipulating assignees, labels
         # and milestones, are provided within the Issues API.
         if representation.pull_request?
-          return if !representation.has_labels? && !representation.has_comments?
+          return unless representation.has_labels? || representation.has_comments?
 
           merge_request = MergeRequest.find_by!(target_project_id: project.id, iid: representation.iid)
 

spec/lib/github/client_spec.rb

+require 'spec_helper'
+
+describe Github::Client do
+  let(:connection) { spy }
+  let(:rate_limit) { double(get: [false, 1]) }
+  let(:client) { described_class.new({}) }
+  let(:results) { double }
+  let(:response) { double }
+
+  before do
+    allow(Faraday).to receive(:new).and_return(connection)
+    allow(Github::RateLimit).to receive(:new).with(connection).and_return(rate_limit)
+  end
+
+  describe '#get' do
+    before do
+      allow(Github::Response).to receive(:new).with(results).and_return(response)
+    end
+
+    it 'uses a default per_page param' do
+      expect(connection).to receive(:get).with('/foo', per_page: 100).and_return(results)
+
+      expect(client.get('/foo')).to eq(response)
+    end
+
+    context 'with per_page given' do
+      it 'overwrites the default per_page' do
+        expect(connection).to receive(:get).with('/foo', per_page: 30).and_return(results)
+
+        expect(client.get('/foo', per_page: 30)).to eq(response)
+      end
+    end
+  end
+end