wrote some tests. really not all that much to test:/

lib/open_project/pdf_export/taskboard_card/document_generator.rb

@@ -51,10 +51,12 @@ module OpenProject::PdfExport::TaskboardCard
         }
 
         card_element = CardElement.new(pdf, orientation, config.rows_hash, wp)
+        if i > 0 && i % @config.per_page == 0
+          pdf.start_new_page
+        end
         card_element.draw
 
         if (i + 1) % @config.per_page == 0
-          pdf.start_new_page
           card_y_offset = pdf.bounds.height - padding
         else
           card_y_offset -= (card_height + padding)

spec/taskboard_card/document_generator_spec.rb

@@ -1,27 +1,63 @@
 require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
 
 describe OpenProject::PdfExport::TaskboardCard::DocumentGenerator do
-  # let(:pdf) { Prawn::Document.new(:margin => 0) }
   let(:config) { TaskboardCardConfiguration.new({
     name: "Default",
     identifier: "default",
     per_page: 1,
     page_size: "A4",
     orientation: "landscape",
-    rows: "rows:\n    row1:\n      has_border: false\n      columns:\n        id:\n          has_label: false\n          font_size: 15\n    row1:\n      has_border: false\n      columns:\n        subject:\n          has_label: false\n          font_size: 15"
+    rows: "rows:\n    row1:\n      has_border: false\n      columns:\n        subject:\n          has_label: false\n          font_size: 15\n    row2:\n      has_border: false\n      columns:\n        non_existent:\n          has_label: false\n          font_size: 15\n          has_label: true\n          render_if_empty: true"
   })}
-  let(:work_package) { WorkPackage.new({
-    id: 1234,
-    subject: "Test work package",
-    description: "This is a test work package"
+
+  let(:work_package1) { WorkPackage.new({
+    subject: "Work package 1",
+    description: "This is work package 1"
+  })}
+
+  let(:work_package2) { WorkPackage.new({
+    subject: "Work package 2",
+    description: "This is work package 2"
   })}
 
-  it 'shows work package subject' do
-    work_packages = [work_package]
-    generator = OpenProject::PdfExport::TaskboardCard::DocumentGenerator.new(config, work_packages)
+  describe "Single work package rendering" do
+    before(:each) do
+      work_packages = [work_package1]
+      @generator = OpenProject::PdfExport::TaskboardCard::DocumentGenerator.new(config, work_packages)
+    end
+
+    it 'shows work package subject' do
+      text_analysis = PDF::Inspector::Text.analyze(@generator.render)
+      text_analysis.strings.include?('Work package 1').should be_true
+    end
+
+    it 'shows empty field label' do
+      text_analysis = PDF::Inspector::Text.analyze(@generator.render)
+      text_analysis.strings.include?('Non existent:-').should be_true
+    end
+
+    it 'should be 1 page' do
+      page_analysis = PDF::Inspector::Page.analyze(@generator.render)
+      page_analysis.pages.size.should == 1
+    end
+  end
+
+  describe "Multiple work package rendering" do
+    before(:each) do
+      work_packages = [work_package1, work_package2]
+      @generator = OpenProject::PdfExport::TaskboardCard::DocumentGenerator.new(config, work_packages)
+    end
+
+    it 'shows work package subject' do
+      text = PDF::Inspector::Text.analyze(@generator.render)
+      text.strings.include?('Work package 1').should be_true
+      text.strings.include?('Work package 2').should be_true
+    end
 
-    text = PDF::Inspector::Text.analyze(generator.render)
-    text.strings.join.should == 'Test work package'
+    it 'should be 2 pages' do
+      page_analysis = PDF::Inspector::Page.analyze(@generator.render)
+      page_analysis.pages.size.should == 2
+    end
   end
 
 end