test: cover PaginationHelpersTest, teardown and ParamsNestedTest

test/test_pagination_helpers.rb

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+require 'minitest/autorun'
+require 'prism'
+require 'tmpdir'
+require 'fileutils'
+
+class PaginationHelpersTest < Minitest::Test
+  def setup
+    @dir = Dir.mktmpdir('prism-pagination-helpers')
+    @store = Prism::Orm::Store.new(File.join(@dir, 'test.pstore'))
+    @store.create_table(:widgets, %w[id name position])
+    widget_class = Class.new(Prism::Orm::Model) { table_name :widgets }
+    widget_class.store = @store
+    Object.const_set(:PaginatedWidget, widget_class)
+    25.times { |i| PaginatedWidget.create!(name: "widget-#{i}", position: i) }
+
+    @context = Prism::Template::Context.new({})
+  end
+
+  def teardown
+    FileUtils.remove_entry(@dir)
+    Object.send(:remove_const, :PaginatedWidget) if Object.const_defined?(:PaginatedWidget)
+  end
+
+  def path_for
+    ->(page) { "/widgets?page=#{page}" }
+  end
+
+  def test_returns_blank_when_everything_fits_on_one_page
+    relation = PaginatedWidget.page(1)
+    assert_equal '', @context.paginate(relation, path: path_for)
+  end
+
+  def test_renders_a_link_per_page_within_the_window
+    relation = PaginatedWidget.order(:position).page(1).per(5)
+    html = @context.paginate(relation, path: path_for)
+    assert_includes html, 'href="/widgets?page=2"'
+    assert_includes html, '>2<'
+  end
+
+  def test_current_page_link_carries_the_current_class
+    relation = PaginatedWidget.order(:position).page(3).per(5)
+    html = @context.paginate(relation, path: path_for)
+    assert_includes html, 'href="/widgets?page=3" class="page-link current"'
+  end
+
+  def test_first_page_disables_the_previous_link
+    relation = PaginatedWidget.order(:position).page(1).per(5)
+    html = @context.paginate(relation, path: path_for)
+    assert_includes html, '<span class="page-link disabled">Previous</span>'
+  end
+
+  def test_last_page_disables_the_next_link
+    relation = PaginatedWidget.order(:position).page(5).per(5)
+    html = @context.paginate(relation, path: path_for)
+    assert_includes html, '<span class="page-link disabled">Next</span>'
+  end
+
+  def test_far_apart_pages_are_separated_by_a_gap_marker
+    relation = PaginatedWidget.order(:position).page(1).per(1)
+    html = @context.paginate(relation, path: path_for)
+    assert_includes html, '<span class="page-gap">...</span>'
+  end
+
+  def test_renders_through_a_real_erb_template
+    views_dir = File.join(@dir, 'views', 'widgets')
+    FileUtils.mkdir_p(views_dir)
+    File.write(File.join(views_dir, 'index.erb'), '<%== paginate(widgets, path: ->(n) { "/widgets?page=#{n}" }) %>')
+
+    view = Prism::View.new(File.join(@dir, 'views'))
+    output = view.render('widgets/index', locals: { widgets: PaginatedWidget.order(:position).page(1).per(5) })
+    assert_includes output, '<nav class="pagination">'
+    assert_includes output, 'href="/widgets?page=2"'
+  end
+end