take title for plot from Daru::DataFrame

Author: ievgrafov

lib/gnuplotrb/plot.rb

@@ -284,6 +284,7 @@ def parse_datasets_array(datasets)
       when Hamster::Vector
         datasets[0]
       when (defined?(Daru) ? Daru::DataFrame : nil)
+        set_name_from_daru_dataframe(datasets[0])
         Hamster::Vector.new(datasets[0].map { |ds| dataset_from_any(ds) })
       else
         Hamster::Vector.new(datasets.map { |ds| dataset_from_any(ds) })
@@ -295,5 +296,9 @@ def parse_datasets_array(datasets)
     def new_with_options(options)
       self.class.new(@datasets, options)
     end
+
+    def set_name_from_daru_dataframe(dataframe)
+      self.title = dataframe.name
+    end
   end
 end

spec/plot_spec.rb

@@ -16,11 +16,6 @@
       @title = 'Awesome spec'
       @formula =  %w(sin(x) cos(x) exp(-x))
       @options = { title: @title, term: 'dumb' }
-      @df = Daru::DataFrame.new(
-        Build: [312, 630, 315, 312],
-        Test: [525, 1050, 701, 514],
-        Deploy: [215, 441, 370, 220]
-      )
     end
 
     it 'should be created out of sequence of datasets' do
@@ -38,10 +33,30 @@
       expect(plot.title).to eql(@title)
     end
 
-    it 'should be created out of Daru::DataFrame' do
-      p = Plot.new(@df)
-      expect(p).to be_an_instance_of(Plot)
-      expect(p.datasets.size).to be_eql(3)
+    context 'creation out of Daru::DataFrame' do
+      let(:df) do
+        Daru::DataFrame.new(
+          {
+            Build: [312, 630, 315, 312],
+            Test: [525, 1050, 701, 514],
+            Deploy: [215, 441, 370, 220]
+          },
+          index: [0, 1, 2, 3],
+          name: 'Dummy DataFrame'
+        )
+      end
+
+      subject { Plot.new(df) }
+
+      it { is_expected.to be_an_instance_of Plot }
+
+      it 'creates datasets for each column except index' do
+        expect(subject.datasets.size).to be 3
+      end
+
+      it 'takes name for plot from DataFrame' do
+        expect(subject.title).to eql(df.name)
+      end
     end
   end