WIP add spec for plot args

Author: darthjee

spec/lib/ruby_gnuplot/data_set_spec.rb

@@ -52,7 +52,7 @@
       end
     end
 
-    context 'when setting attributes' do
+    context 'when setting attributes in a block' do
       subject(:data_set) do
         described_class.new do |ds|
           ds.with  = 'lines'
@@ -67,4 +67,23 @@
       end
     end
   end
+
+  describe '#plot_args' do
+    context 'when setting attributes on initialize block' do
+      subject(:data_set) do
+        described_class.new do |ds|
+          ds.with  = 'lines'
+          ds.using = '1:2'
+          ds.data = data
+        end
+      end
+
+      let(:data) { [ [0, 1, 2], [1, 2, 5] ] }
+
+      it 'returns plot attributes' do
+        expect(data_set.plot_args)
+          .to eq("'-' using 1:2 with lines")
+      end
+    end
+  end
 end