quality: add unit test for code submissions with long lines

test/models/task_test.rb

@@ -1,4 +1,5 @@
 require 'test_helper'
+require 'pdf-reader'
 
 #
 # Contains tests for Task model objects - not accessed via API
@@ -362,4 +363,54 @@ def test_ipynb_to_pdf
     unit.destroy!
   end
 
+  def test_code_submission_with_long_lines
+    unit = FactoryBot.create(:unit, student_count: 1, task_count: 0)
+    td = TaskDefinition.new({
+        unit_id: unit.id,
+        tutorial_stream: unit.tutorial_streams.first,
+        name: 'Task with super ling lines in code submission',
+        description: 'Code task',
+        weighting: 4,
+        target_grade: 0,
+        start_date: unit.start_date + 1.week,
+        target_date: unit.start_date + 2.weeks,
+        abbreviation: 'Long',
+        restrict_status_updates: false,
+        upload_requirements: [ { "key" => 'file0', "name" => 'long.py', "type" => 'code' } ],
+        plagiarism_warn_pct: 0.8,
+        is_graded: false,
+        max_quality_pts: 0
+      })
+    td.save!
+
+    data_to_post = {
+      trigger: 'ready_for_feedback'
+    }
+
+    data_to_post = with_file('test_files/submissions/long.py', 'application/json', data_to_post)
+
+    project = unit.active_projects.first
+
+    add_auth_header_for user: unit.main_convenor_user
+
+    post "/api/projects/#{project.id}/task_def_id/#{td.id}/submission", data_to_post
+
+    assert_equal 201, last_response.status, last_response_body
+
+    # test submission generation
+    task = project.task_for_task_definition(td)
+    assert task.convert_submission_to_pdf
+    path = task.zip_file_path_for_done_task
+    assert path
+    assert File.exist? path
+    assert File.exist? task.final_pdf_path
+
+    # ensure the notice is included when rendered files are truncated
+    reader = PDF::Reader.new(task.final_pdf_path)
+    assert reader.pages[1].text.include? "This file has additional line breaks applied"
+
+    td.destroy
+    assert_not File.exist? path
+    unit.destroy!
+  end
 end