From d23fb5fec37f462110abc140d3db610d8c83a717 Mon Sep 17 00:00:00 2001
From: DualFroz <me@dualfroz.com>
Date: Sun, 13 Sep 2026 18:46:37 +0200
Subject: [PATCH] test: cover PaginationHelpersTest, teardown and
 ParamsNestedTest

---
 test/test_pagination_helpers.rb | 74 +++++++++++++++++++++++++++++++
 test/test_params_nested.rb      | 77 +++++++++++++++++++++++++++++++++
 2 files changed, 151 insertions(+)
 create mode 100644 test/test_pagination_helpers.rb
 create mode 100644 test/test_params_nested.rb

diff --git a/test/test_pagination_helpers.rb b/test/test_pagination_helpers.rb
new file mode 100644
index 0000000..6ac4a68
--- /dev/null
+++ b/test/test_pagination_helpers.rb
@@ -0,0 +1,74 @@
+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
diff --git a/test/test_params_nested.rb b/test/test_params_nested.rb
new file mode 100644
index 0000000..d5a7e71
--- /dev/null
+++ b/test/test_params_nested.rb
@@ -0,0 +1,77 @@
+require 'minitest/autorun'
+require 'prism'
+require 'support'
+
+class ParamsNestedTest < Minitest::Test
+  include TestSupport
+
+  def test_nested_from_expands_bracketed_keys_into_a_hash
+    params = Prism::Params.nested_from([['post[title]', 'hi'], ['post[body]', 'yo']])
+    assert_equal 'hi', params['post']['title']
+    assert_equal 'yo', params['post']['body']
+  end
+
+  def test_nested_from_collects_trailing_brackets_into_an_array
+    params = Prism::Params.nested_from([['tags[]', 'ruby'], ['tags[]', 'web']])
+    assert_equal %w[ruby web], params['tags']
+  end
+
+  def test_nested_from_supports_an_array_nested_under_a_hash_key
+    params = Prism::Params.nested_from([['post[tags][]', 'a'], ['post[tags][]', 'b']])
+    assert_equal %w[a b], params['post']['tags']
+  end
+
+  def test_nested_from_supports_multiple_levels_of_nesting
+    params = Prism::Params.nested_from([['address[city][zip]', '00-001']])
+    assert_equal '00-001', params['address']['city']['zip']
+  end
+
+  def test_nested_from_leaves_plain_keys_untouched
+    params = Prism::Params.nested_from([['title', 'hi']])
+    assert_equal 'hi', params['title']
+  end
+
+  def test_nested_from_symbol_and_string_keys_are_interchangeable_at_every_level
+    params = Prism::Params.nested_from([['post[title]', 'hi']])
+    assert_equal 'hi', params[:post][:title]
+  end
+
+  def test_urlencoded_form_body_with_object_bracket_names_is_parsed_as_nested_params
+    request = Prism::Request.new(env_for('POST', '/posts',
+                                          headers: { 'Content-Type' => 'application/x-www-form-urlencoded' },
+                                          body: 'post%5Btitle%5D=Hello&post%5Bbody%5D=World&tags%5B%5D=a&tags%5B%5D=b'))
+    assert_equal 'Hello', request.params['post']['title']
+    assert_equal 'World', request.params['post']['body']
+    assert_equal %w[a b], request.params['tags']
+  end
+
+  def test_urlencoded_query_string_with_object_bracket_names_is_parsed_as_nested_params
+    request = Prism::Request.new(env_for('GET', '/search?filter%5Bname%5D=fox&filter%5Bactive%5D=1'))
+    assert_equal 'fox', request.params['filter']['name']
+    assert_equal '1', request.params['filter']['active']
+  end
+
+  def test_nested_form_params_survive_a_strong_parameters_require_and_permit_round_trip
+    request = Prism::Request.new(env_for('POST', '/posts',
+                                          headers: { 'Content-Type' => 'application/x-www-form-urlencoded' },
+                                          body: 'post%5Btitle%5D=Hello&post%5Badmin%5D=1'))
+    permitted = request.params.require(:post).permit(:title)
+    assert_equal({ 'title' => 'Hello' }, permitted.to_h)
+  end
+
+  def test_multipart_body_with_object_bracket_names_is_parsed_as_nested_params
+    boundary = '----ParamsNestedTestBoundary'
+    body = [
+      "--#{boundary}\r\nContent-Disposition: form-data; name=\"post[title]\"\r\n\r\nHello\r\n",
+      "--#{boundary}\r\nContent-Disposition: form-data; name=\"post[cover]\"; filename=\"a.png\"\r\n" \
+        "Content-Type: image/png\r\n\r\nbytes\r\n",
+      "--#{boundary}--\r\n"
+    ].join
+    request = Prism::Request.new(env_for('POST', '/posts',
+                                          headers: { 'Content-Type' => "multipart/form-data; boundary=#{boundary}" },
+                                          body: body))
+    assert_equal 'Hello', request.params['post']['title']
+    assert_instance_of Prism::UploadedFile, request.params['post']['cover']
+    assert_equal 'a.png', request.params['post']['cover'].original_filename
+  end
+end