test/lib/rich_text_test.rb

   1 # frozen_string_literal: true
   2
   3 require "test_helper"
   4
   5 class RichTextTest < ActiveSupport::TestCase
   6   include Rails::Dom::Testing::Assertions::SelectorAssertions
   7
   8   def test_html_to_html
   9     r = RichText.new("html", "foo http://example.com/ bar")
  10     assert_html r do
  11       assert_select "a", 1
  12       assert_select "a[href='http://example.com/']", 1
  13       assert_select "a[rel='nofollow noopener noreferrer']", 1
  14     end
  15
  16     r = RichText.new("html", "foo <a href='http://example.com/'>bar</a> baz")
  17     assert_html r do
  18       assert_select "a", 1
  19       assert_select "a[href='http://example.com/']", 1
  20       assert_select "a[rel='nofollow noopener noreferrer']", 1
  21     end
  22
  23     r = RichText.new("html", "foo <a rel='junk me trash' href='http://example.com/'>bar</a> baz")
  24     assert_html r do
  25       assert_select "a", 1
  26       assert_select "a[href='http://example.com/']", 1
  27       assert_select "a[rel='me nofollow noopener noreferrer']", 1
  28     end
  29
  30     r = RichText.new("html", "foo example@example.com bar")
  31     assert_html r do
  32       assert_select "a", 0
  33     end
  34
  35     r = RichText.new("html", "foo <a href='mailto:example@example.com'>bar</a> baz")
  36     assert_html r do
  37       assert_select "a", 1
  38       assert_select "a[href='mailto:example@example.com']", 1
  39       assert_select "a[rel='nofollow noopener noreferrer']", 1
  40     end
  41
  42     r = RichText.new("html", "foo <div>bar</div> baz")
  43     assert_html r do
  44       assert_select "div", false
  45       assert_select "p", /^foo *bar *baz$/
  46     end
  47
  48     r = RichText.new("html", "foo <script>bar = 1;</script> baz")
  49     assert_html r do
  50       assert_select "script", false
  51       assert_select "p", /^foo *baz$/
  52     end
  53
  54     r = RichText.new("html", "foo <style>div { display: none; }</style> baz")
  55     assert_html r do
  56       assert_select "style", false
  57       assert_select "p", /^foo *baz$/
  58     end
  59
  60     r = RichText.new("html", "<table><tr><td>column</td></tr></table>")
  61     assert_html r do
  62       assert_select "table[class='table table-sm w-auto']"
  63     end
  64
  65     r = RichText.new("html", "<p class='btn btn-warning'>Click Me</p>")
  66     assert_html r do
  67       assert_select "p[class='btn btn-warning']", false
  68       assert_select "p", /^Click Me$/
  69     end
  70
  71     r = RichText.new("html", "<p style='color:red'>Danger</p>")
  72     assert_html r do
  73       assert_select "p[style='color:red']", false
  74       assert_select "p", /^Danger$/
  75     end
  76   end
  77
  78   def test_html_to_text
  79     r = RichText.new("html", "foo <a href='http://example.com/'>bar</a> baz")
  80     assert_equal "foo <a href='http://example.com/'>bar</a> baz", r.to_text
  81   end
  82
  83   def test_markdown_to_html
  84     r = RichText.new("markdown", "foo http://example.com/ bar")
  85     assert_html r do
  86       assert_select "a", 1
  87       assert_select "a[href='http://example.com/']", 1
  88       assert_select "a[rel='nofollow noopener noreferrer']", 1
  89     end
  90
  91     r = RichText.new("markdown", "foo [bar](http://example.com/) baz")
  92     assert_html r do
  93       assert_select "a", 1
  94       assert_select "a[href='http://example.com/']", 1
  95       assert_select "a[rel='nofollow noopener noreferrer']", 1
  96     end
  97
  98     r = RichText.new("markdown", "foo <a rel='junk me trash' href='http://example.com/'>bar</a>) baz")
  99     assert_html r do
 100       assert_select "a", 1
 101       assert_select "a[href='http://example.com/']", 1
 102       assert_select "a[rel='me nofollow noopener noreferrer']", 1
 103     end
 104
 105     r = RichText.new("markdown", "foo example@example.com bar")
 106     assert_html r do
 107       assert_select "a", 1
 108       assert_select "a[href='mailto:example@example.com']", 1
 109       assert_select "a[rel='nofollow noopener noreferrer']", 1
 110     end
 111
 112     r = RichText.new("markdown", "foo [bar](mailto:example@example.com) bar")
 113     assert_html r do
 114       assert_select "a", 1
 115       assert_select "a[href='mailto:example@example.com']", 1
 116       assert_select "a[rel='nofollow noopener noreferrer']", 1
 117     end
 118
 119     r = RichText.new("markdown", "foo ![bar](http://example.com/example.png) bar")
 120     assert_html r do
 121       assert_select "img", 1
 122       assert_select "img[alt='bar']", 1
 123       assert_select "img[src='http://example.com/example.png']", 1
 124     end
 125
 126     r = RichText.new("markdown", "# foo bar baz")
 127     assert_html r do
 128       assert_select "h1", "foo bar baz"
 129     end
 130
 131     r = RichText.new("markdown", "## foo bar baz")
 132     assert_html r do
 133       assert_select "h2", "foo bar baz"
 134     end
 135
 136     r = RichText.new("markdown", "### foo bar baz")
 137     assert_html r do
 138       assert_select "h3", "foo bar baz"
 139     end
 140
 141     r = RichText.new("markdown", "* foo bar baz")
 142     assert_html r do
 143       assert_select "ul" do
 144         assert_select "li", "foo bar baz"
 145       end
 146     end
 147
 148     r = RichText.new("markdown", "1. foo bar baz")
 149     assert_html r do
 150       assert_select "ol" do
 151         assert_select "li", "foo bar baz"
 152       end
 153     end
 154
 155     r = RichText.new("markdown", "foo *bar* _baz_ qux")
 156     assert_html r do
 157       assert_select "em", "bar"
 158       assert_select "em", "baz"
 159     end
 160
 161     r = RichText.new("markdown", "foo **bar** __baz__ qux")
 162     assert_html r do
 163       assert_select "strong", "bar"
 164       assert_select "strong", "baz"
 165     end
 166
 167     r = RichText.new("markdown", "foo `bar` baz")
 168     assert_html r do
 169       assert_select "code", "bar"
 170     end
 171
 172     r = RichText.new("markdown", "    foo bar baz")
 173     assert_html r do
 174       assert_select "pre", /^\s*foo bar baz\s*$/
 175     end
 176
 177     r = RichText.new("markdown", "|column|column")
 178     assert_html r do
 179       assert_select "table[class='table table-sm w-auto']"
 180     end
 181
 182     r = RichText.new("markdown", "Click Me\n{:.btn.btn-warning}")
 183     assert_html r do
 184       assert_select "p[class='btn btn-warning']", false
 185       assert_select "p", /^Click Me$/
 186     end
 187
 188     r = RichText.new("markdown", "<p style='color:red'>Danger</p>")
 189     assert_html r do
 190       assert_select "p[style='color:red']", false
 191       assert_select "p", /^Danger$/
 192     end
 193   end
 194
 195   def test_markdown_table_alignment
 196     # Ensure that kramdown table alignment styles are converted to bootstrap classes
 197     markdown_table = <<~MARKDOWN
 198       | foo  | bar |
 199       |:----:|----:|
 200       |center|right|
 201     MARKDOWN
 202     r = RichText.new("markdown", markdown_table)
 203     assert_html r do
 204       assert_select "td[style='text-align:center']", false
 205       assert_select "td[class='text-center']", true
 206       assert_select "td[style='text-align:right']", false
 207       assert_select "td[class='text-end']", true
 208     end
 209   end
 210
 211   def test_markdown_to_text
 212     r = RichText.new("markdown", "foo [bar](http://example.com/) baz")
 213     assert_equal "foo [bar](http://example.com/) baz", r.to_text
 214   end
 215
 216   def test_text_to_html_linkify
 217     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me.example.com"], :host_replacement => "repl.example.com" }] }) do
 218       r = RichText.new("text", "foo http://example.com/ bar")
 219       assert_html r do
 220         assert_dom "a", :count => 1, :text => "http://example.com/" do
 221           assert_dom "> @href", "http://example.com/"
 222           assert_dom "> @rel", "nofollow noopener noreferrer"
 223         end
 224       end
 225     end
 226   end
 227
 228   def test_text_to_html_linkify_replace
 229     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me.example.com"], :host_replacement => "repl.example.com" }] }) do
 230       r = RichText.new("text", "foo https://replace-me.example.com/some/path?query=te<st&limit=20>10#result12 bar")
 231       assert_html r do
 232         assert_dom "a", :count => 1, :text => "repl.example.com/some/path?query=te<st&limit=20>10#result12" do
 233           assert_dom "> @href", "https://replace-me.example.com/some/path?query=te<st&limit=20>10#result12"
 234           assert_dom "> @rel", "nofollow noopener noreferrer"
 235         end
 236       end
 237     end
 238   end
 239
 240   def test_text_to_html_linkify_recognize
 241     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me.example.com"], :host_replacement => "repl.example.com" }] }) do
 242       r = RichText.new("text", "foo repl.example.com/some/path?query=te<st&limit=20>10#result12 bar")
 243       assert_html r do
 244         assert_dom "a", :count => 1, :text => "repl.example.com/some/path?query=te<st&limit=20>10#result12" do
 245           assert_dom "> @href", "http://replace-me.example.com/some/path?query=te<st&limit=20>10#result12"
 246           assert_dom "> @rel", "nofollow noopener noreferrer"
 247         end
 248       end
 249     end
 250   end
 251
 252   def test_text_to_html_linkify_replace_other_scheme
 253     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me.example.com"], :host_replacement => "repl.example.com" }] }) do
 254       r = RichText.new("text", "foo ftp://replace-me.example.com/some/path?query=te<st&limit=20>10#result12 bar")
 255       assert_html r do
 256         assert_dom "a", :count => 1, :text => "ftp://replace-me.example.com/some/path?query=te<st&limit=20>10#result12" do
 257           assert_dom "> @href", "ftp://replace-me.example.com/some/path?query=te<st&limit=20>10#result12"
 258           assert_dom "> @rel", "nofollow noopener noreferrer"
 259         end
 260       end
 261     end
 262   end
 263
 264   def test_text_to_html_linkify_replace_undefined
 265     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me.example.com"] }] }) do
 266       r = RichText.new("text", "foo https://replace-me.example.com/some/path?query=te<st&limit=20>10#result12 bar")
 267       assert_html r do
 268         assert_dom "a", :count => 1, :text => "https://replace-me.example.com/some/path?query=te<st&limit=20>10#result12" do
 269           assert_dom "> @href", "https://replace-me.example.com/some/path?query=te<st&limit=20>10#result12"
 270           assert_dom "> @rel", "nofollow noopener noreferrer"
 271         end
 272       end
 273     end
 274   end
 275
 276   def test_text_to_html_linkify_wiki_replace_prefix
 277     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me-wiki.example.com"], :host_replacement => "wiki.example.com", :optional_path_prefix => "^/wiki(?=/[A-Z])" }] }) do
 278       r = RichText.new("text", "foo https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal bar")
 279       assert_html r do
 280         assert_dom "a", :count => 1, :text => "wiki.example.com/Tag:surface%3Dmetal" do
 281           assert_dom "> @href", "https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal"
 282           assert_dom "> @rel", "nofollow noopener noreferrer"
 283         end
 284       end
 285     end
 286   end
 287
 288   def test_text_to_html_linkify_wiki_replace_prefix_undefined
 289     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me-wiki.example.com"], :host_replacement => "wiki.example.com" }] }) do
 290       r = RichText.new("text", "foo https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal bar")
 291       assert_html r do
 292         assert_dom "a", :count => 1, :text => "wiki.example.com/wiki/Tag:surface%3Dmetal" do
 293           assert_dom "> @href", "https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal"
 294           assert_dom "> @rel", "nofollow noopener noreferrer"
 295         end
 296       end
 297     end
 298   end
 299
 300   def test_text_to_html_linkify_wiki_replace_undefined_prefix
 301     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me-wiki.example.com"], :optional_path_prefix => "^/wiki(?=/[A-Z])" }] }) do
 302       r = RichText.new("text", "foo https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal bar")
 303       assert_html r do
 304         assert_dom "a", :count => 1, :text => "https://replace-me-wiki.example.com/Tag:surface%3Dmetal" do
 305           assert_dom "> @href", "https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal"
 306           assert_dom "> @rel", "nofollow noopener noreferrer"
 307         end
 308       end
 309     end
 310   end
 311
 312   def test_text_to_html_linkify_wiki_replace_prefix_no_match
 313     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me-wiki.example.com"], :host_replacement => "wiki.example.com", :optional_path_prefix => "^/wiki(?=/[A-Z])" }] }) do
 314       r = RichText.new("text", "foo https://replace-me-wiki.example.com/wiki/w bar")
 315       assert_html r do
 316         assert_dom "a", :count => 1, :text => "wiki.example.com/wiki/w" do
 317           assert_dom "> @href", "https://replace-me-wiki.example.com/wiki/w"
 318           assert_dom "> @rel", "nofollow noopener noreferrer"
 319         end
 320       end
 321     end
 322   end
 323
 324   def test_text_to_html_linkify_recognize_wiki
 325     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["replace-me-wiki.example.com"], :host_replacement => "wiki.example.com", :optional_path_prefix => "^/wiki(?=/[A-Z])" }] }) do
 326       r = RichText.new("text", "foo wiki.example.com/Tag:surface%3Dmetal bar")
 327       assert_html r do
 328         assert_dom "a", :count => 1, :text => "wiki.example.com/Tag:surface%3Dmetal" do
 329           assert_dom "> @href", "http://replace-me-wiki.example.com/Tag:surface%3Dmetal"
 330           assert_dom "> @rel", "nofollow noopener noreferrer"
 331         end
 332       end
 333     end
 334   end
 335
 336   def test_text_to_html_linkify_idempotent
 337     with_settings(:linkify => { :normalisation_rules => [{ :hosts => ["test.host"], :host_replacement => "test.host" }] }) do
 338       t0 = "foo https://test.host/way/123456789 bar"
 339
 340       r1 = RichText.new("text", t0)
 341       t1 = Nokogiri::HTML.fragment(r1.to_html).text
 342
 343       r2 = RichText.new("text", t1)
 344       t2 = Nokogiri::HTML.fragment(r2.to_html).text
 345
 346       assert_equal t1, t2
 347     end
 348   end
 349
 350   def test_text_to_html_linkify_recognize_path
 351     with_settings(:linkify => { :detection_rules => [{ :patterns => ["@(?<username>\\w+)"], :path_template => "user/\\k<username>" }] }) do
 352       r = RichText.new("text", "foo @example bar")
 353       assert_html r do
 354         assert_dom "a", :count => 1, :text => "http://test.host/user/example" do
 355           assert_dom "> @href", "http://test.host/user/example"
 356           assert_dom "> @rel", "nofollow noopener noreferrer"
 357         end
 358       end
 359     end
 360   end
 361
 362   def test_text_to_html_linkify_recognize_path_no_partial_match
 363     with_settings(:linkify => { :detection_rules => [{ :patterns => ["@(?<username>\\w+)"], :path_template => "user/\\k<username>" }] }) do
 364       r = RichText.new("text", "foo example@example.com bar")
 365       assert_html r do
 366         assert_select "a", 0
 367       end
 368     end
 369   end
 370
 371   def test_text_to_html_linkify_recognize_wiki_path
 372     with_settings(:linkify => { :detection_rules => [{ :patterns => ["(?<key>[^\"?#<>/\\s]+)=(?<value>[^\"?#<>\\s]+)"], :path_template => "Tag:\\k<key>=\\k<value>", :host => "http://example.wiki" }] }) do
 373       r = RichText.new("text", "foo surface=metal bar")
 374       assert_html r do
 375         assert_dom "a", :count => 1, :text => "http://example.wiki/Tag:surface=metal" do
 376           assert_dom "> @href", "http://example.wiki/Tag:surface=metal"
 377           assert_dom "> @rel", "nofollow noopener noreferrer"
 378         end
 379       end
 380     end
 381     with_settings(:linkify => { :detection_rules => [{ :patterns => ["(?<key>[^\"?#<>/\\s]+)=\\*?"], :path_template => "Key:\\k<key>", :host => "http://example.wiki" }] }) do
 382       r = RichText.new("text", "foo surface=* bar")
 383       assert_html r do
 384         assert_dom "a", :count => 1, :text => "http://example.wiki/Key:surface" do
 385           assert_dom "> @href", "http://example.wiki/Key:surface"
 386           assert_dom "> @rel", "nofollow noopener noreferrer"
 387         end
 388       end
 389     end
 390   end
 391
 392   def test_text_to_html_linkify_openstreetmap_links
 393     with_settings(:server_url => "www.openstreetmap.org", :server_protocol => "https") do
 394       cases = {
 395         "https://www.openstreetmap.org/note/4655490" =>
 396           ["note/4655490", "https://www.openstreetmap.org/note/4655490"],
 397
 398         "https://www.openstreetmap.org/changeset/163353772" =>
 399           ["changeset/163353772", "https://www.openstreetmap.org/changeset/163353772"],
 400
 401         "https://www.openstreetmap.org/way/1249366504" =>
 402           ["way/1249366504", "https://www.openstreetmap.org/way/1249366504"],
 403
 404         "https://www.openstreetmap.org/way/1249366504/history" =>
 405           ["way/1249366504/history", "https://www.openstreetmap.org/way/1249366504/history"],
 406
 407         "https://www.openstreetmap.org/way/1249366504/history/2" =>
 408           ["way/1249366504/history/2", "https://www.openstreetmap.org/way/1249366504/history/2"],
 409
 410         "https://www.openstreetmap.org/node/12639964186" =>
 411           ["node/12639964186", "https://www.openstreetmap.org/node/12639964186"],
 412
 413         "https://www.openstreetmap.org/relation/7876483" =>
 414           ["relation/7876483", "https://www.openstreetmap.org/relation/7876483"],
 415
 416         "https://www.openstreetmap.org/user/aharvey" =>
 417           ["@aharvey", "https://www.openstreetmap.org/user/aharvey"],
 418
 419         "https://wiki.openstreetmap.org/wiki/Key:boundary" =>
 420           ["boundary=*", "https://wiki.openstreetmap.org/wiki/Key:boundary"],
 421
 422         "https://wiki.openstreetmap.org/wiki/Tag:boundary=place" =>
 423           ["boundary=place", "https://wiki.openstreetmap.org/wiki/Tag:boundary=place"],
 424
 425         "boundary=*" =>
 426           ["boundary=*", "https://wiki.openstreetmap.org/wiki/Key:boundary"],
 427
 428         "boundary=place" =>
 429           ["boundary=place", "https://wiki.openstreetmap.org/wiki/Tag:boundary=place"],
 430
 431         "@aharvey" =>
 432           ["@aharvey", "https://www.openstreetmap.org/user/aharvey"],
 433
 434         "node/12639964186" =>
 435           ["node/12639964186", "https://www.openstreetmap.org/node/12639964186"],
 436
 437         "node 12639964186" =>
 438           ["node/12639964186", "https://www.openstreetmap.org/node/12639964186"],
 439
 440         "n12639964186" =>
 441           ["node/12639964186", "https://www.openstreetmap.org/node/12639964186"],
 442
 443         "way/1249366504" =>
 444           ["way/1249366504", "https://www.openstreetmap.org/way/1249366504"],
 445
 446         "way 1249366504" =>
 447           ["way/1249366504", "https://www.openstreetmap.org/way/1249366504"],
 448
 449         "w1249366504" =>
 450           ["way/1249366504", "https://www.openstreetmap.org/way/1249366504"],
 451
 452         "relation/7876483" =>
 453           ["relation/7876483", "https://www.openstreetmap.org/relation/7876483"],
 454
 455         "relation 7876483" =>
 456           ["relation/7876483", "https://www.openstreetmap.org/relation/7876483"],
 457
 458         "r7876483" =>
 459           ["relation/7876483", "https://www.openstreetmap.org/relation/7876483"],
 460
 461         "changeset/163353772" =>
 462           ["changeset/163353772", "https://www.openstreetmap.org/changeset/163353772"],
 463
 464         "changeset 163353772" =>
 465           ["changeset/163353772", "https://www.openstreetmap.org/changeset/163353772"],
 466
 467         "note/4655490" =>
 468           ["note/4655490", "https://www.openstreetmap.org/note/4655490"],
 469
 470         "note 4655490" =>
 471           ["note/4655490", "https://www.openstreetmap.org/note/4655490"]
 472       }
 473
 474       cases.each do |input, (expected_text, expected_href)|
 475         r = RichText.new("text", input)
 476         assert_html r do
 477           assert_dom "a[href='#{expected_href}']", :count => 1, :text => expected_text
 478         end
 479       end
 480     end
 481   end
 482
 483   def test_text_to_html_linkify_no_year_misinterpretation
 484     r = RichText.new("text", "We thought there was no way 2020 could be worse than 2019. We were wrong. Please note 2025 is the first square year since OSM started. In that year, some osmlab repos switched from node 22 to bun 1.3.")
 485     assert_html r do
 486       assert_select "a", 0
 487     end
 488   end
 489
 490   def test_deactivated_linkify_expansion_in_markdown
 491     t0 = "foo `surface=metal` bar"
 492
 493     r1 = RichText.new("markdown", t0)
 494     t1 = Nokogiri::HTML.fragment(r1.to_html).text
 495
 496     assert_equal t0.delete("`"), t1.strip
 497   end
 498
 499   def test_text_to_html_linkify_trims_punctuation
 500     r = RichText.new("text", "foo `surface=metal) bar inscription=🙂 baz")
 501     assert_html r do
 502       assert_dom "a", :count => 1
 503       assert_dom "a[href$='Tag:surface=metal']", :text => "surface=metal"
 504     end
 505   end
 506
 507   def test_text_to_html_linkify_recognizes_non_standard_wiki_pages
 508     r_paren = RichText.new("text", "foo source=Isle_of_Man_Government_1:25000_map_(2007) bar")
 509     assert_html r_paren do
 510       assert_dom "a[href*='Tag:source']", :text => "source=Isle_of_Man_Government_1:25000_map_(2007)"
 511     end
 512     r_latin_ext = RichText.new("text", "foo cuisine=açaí bar")
 513     assert_html r_latin_ext do
 514       assert_dom "a[href*='Tag:cuisine']", :text => "cuisine=açaí"
 515     end
 516     r_cyrillic = RichText.new("text", "foo name=Продукты bar")
 517     assert_html r_cyrillic do
 518       assert_dom "a[href*='Tag:name']", :text => "name=Продукты"
 519     end
 520     r_cjk = RichText.new("text", "foo shop=園芸店 bar")
 521     assert_html r_cjk do
 522       assert_dom "a[href*='Tag:shop']", :text => "shop=園芸店"
 523     end
 524   end
 525
 526   def test_text_to_html_email
 527     r = RichText.new("text", "foo example@example.com bar")
 528     assert_html r do
 529       assert_select "a", 0
 530     end
 531   end
 532
 533   def test_text_to_html_escape
 534     r = RichText.new("text", "foo < bar & baz > qux")
 535     assert_html r do
 536       assert_select "p", "foo < bar & baz > qux"
 537     end
 538   end
 539
 540   def test_text_to_text
 541     r = RichText.new("text", "foo http://example.com/ bar")
 542     assert_equal "foo http://example.com/ bar", r.to_text
 543   end
 544
 545   def test_text_no_opengraph_properties
 546     r = RichText.new("text", "foo https://example.com/ bar")
 547     assert_nil r.image
 548     assert_nil r.image_alt
 549     assert_nil r.description
 550   end
 551
 552   def test_html_no_opengraph_properties
 553     r = RichText.new("html", "foo <a href='https://example.com/'>bar</a> baz")
 554     assert_nil r.image
 555     assert_nil r.image_alt
 556     assert_nil r.description
 557   end
 558
 559   def test_markdown_no_image
 560     r = RichText.new("markdown", "foo [bar](https://example.com/) baz")
 561     assert_nil r.image
 562     assert_nil r.image_alt
 563   end
 564
 565   def test_markdown_image
 566     r = RichText.new("markdown", "foo ![bar](https://example.com/image.jpg) baz")
 567     assert_equal "https://example.com/image.jpg", r.image
 568     assert_equal "bar", r.image_alt
 569   end
 570
 571   def test_markdown_first_image
 572     r = RichText.new("markdown", "foo ![bar1](https://example.com/image1.jpg) baz\nfoo ![bar2](https://example.com/image2.jpg) baz")
 573     assert_equal "https://example.com/image1.jpg", r.image
 574     assert_equal "bar1", r.image_alt
 575   end
 576
 577   def test_markdown_image_with_empty_src
 578     r = RichText.new("markdown", "![invalid]()")
 579     assert_nil r.image
 580     assert_nil r.image_alt
 581   end
 582
 583   def test_markdown_skip_image_with_empty_src
 584     r = RichText.new("markdown", "![invalid]() ![valid](https://example.com/valid.gif)")
 585     assert_equal "https://example.com/valid.gif", r.image
 586     assert_equal "valid", r.image_alt
 587   end
 588
 589   def test_markdown_html_image
 590     r = RichText.new("markdown", "<img src='https://example.com/img_element.png' alt='alt text here'>")
 591     assert_equal "https://example.com/img_element.png", r.image
 592     assert_equal "alt text here", r.image_alt
 593   end
 594
 595   def test_markdown_html_image_without_alt
 596     r = RichText.new("markdown", "<img src='https://example.com/img_element.png'>")
 597     assert_equal "https://example.com/img_element.png", r.image
 598     assert_nil r.image_alt
 599   end
 600
 601   def test_markdown_html_image_with_empty_src
 602     r = RichText.new("markdown", "<img src='' alt='forgot src'>")
 603     assert_nil r.image
 604     assert_nil r.image_alt
 605   end
 606
 607   def test_markdown_skip_html_image_with_empty_src
 608     r = RichText.new("markdown", "<img src='' alt='forgot src'> <img src='https://example.com/next_img_element.png' alt='have src'>")
 609     assert_equal "https://example.com/next_img_element.png", r.image
 610     assert_equal "have src", r.image_alt
 611   end
 612
 613   def test_markdown_html_image_without_src
 614     r = RichText.new("markdown", "<img alt='totally forgot src'>")
 615     assert_nil r.image
 616     assert_nil r.image_alt
 617   end
 618
 619   def test_markdown_skip_html_image_without_src
 620     r = RichText.new("markdown", "<img alt='totally forgot src'> <img src='https://example.com/next_img_element.png' alt='have src'>")
 621     assert_equal "https://example.com/next_img_element.png", r.image
 622     assert_equal "have src", r.image_alt
 623   end
 624
 625   def test_markdown_no_description
 626     r = RichText.new("markdown", "#Nope")
 627     assert_nil r.description
 628   end
 629
 630   def test_markdown_description
 631     r = RichText.new("markdown", "This is an article about something.")
 632     assert_equal "This is an article about something.", r.description
 633   end
 634
 635   def test_markdown_description_after_heading
 636     r = RichText.new("markdown", "#Heading\n\nHere starts the text.")
 637     assert_equal "Here starts the text.", r.description
 638   end
 639
 640   def test_markdown_description_after_image
 641     r = RichText.new("markdown", "![bar](https://example.com/image.jpg)\n\nThis is below the image.")
 642     assert_equal "This is below the image.", r.description
 643   end
 644
 645   def test_markdown_description_only_first_paragraph
 646     r = RichText.new("markdown", "This thing.\n\nMaybe also that thing.")
 647     assert_equal "This thing.", r.description
 648   end
 649
 650   def test_markdown_description_elements
 651     r = RichText.new("markdown", "*Something* **important** [here](https://example.com/).")
 652     assert_equal "Something important here.", r.description
 653   end
 654
 655   def test_markdown_html_description
 656     r = RichText.new("markdown", "<p>Can use HTML tags.</p>")
 657     assert_equal "Can use HTML tags.", r.description
 658   end
 659
 660   def test_markdown_description_max_length
 661     m = RichText::DESCRIPTION_MAX_LENGTH
 662     o = 3 # "...".length
 663
 664     r = RichText.new("markdown", "x" * m)
 665     assert_equal "x" * m, r.description
 666
 667     r = RichText.new("markdown", "y" * (m + 1))
 668     assert_equal "#{'y' * (m - o)}...", r.description
 669
 670     r = RichText.new("markdown", "*zzzzzzzzz*z" * ((m + 1) / 10.0).ceil)
 671     assert_equal "#{'z' * (m - o)}...", r.description
 672   end
 673
 674   def test_markdown_description_word_break_threshold_length
 675     m = RichText::DESCRIPTION_MAX_LENGTH
 676     t = RichText::DESCRIPTION_WORD_BREAK_THRESHOLD_LENGTH
 677     o = 3 # "...".length
 678
 679     r = RichText.new("markdown", "#{'x' * (t - o - 1)} #{'y' * (m - (t - o - 1) - 1)}")
 680     assert_equal "#{'x' * (t - o - 1)} #{'y' * (m - (t - o - 1) - 1)}", r.description
 681
 682     r = RichText.new("markdown", "#{'x' * (t - o - 1)} #{'y' * (m - (t - o - 1))}")
 683     assert_equal "#{'x' * (t - o - 1)} #{'y' * (m - (t - o - 1) - 4)}...", r.description
 684
 685     r = RichText.new("markdown", "#{'x' * (t - o)} #{'y' * (m - (t - o) - 1)}")
 686     assert_equal "#{'x' * (t - o)} #{'y' * (m - (t - o) - 1)}", r.description
 687
 688     r = RichText.new("markdown", "#{'x' * (t - o)} #{'y' * (m - (t - o))}")
 689     assert_equal "#{'x' * (t - o)}...", r.description
 690   end
 691
 692   def test_markdown_description_word_break_multiple_spaces
 693     m = RichText::DESCRIPTION_MAX_LENGTH
 694     t = RichText::DESCRIPTION_WORD_BREAK_THRESHOLD_LENGTH
 695     o = 3 # "...".length
 696
 697     r = RichText.new("markdown", "#{'x' * (t - o)}  #{'y' * (m - (t - o - 1))}")
 698     assert_equal "#{'x' * (t - o)}...", r.description
 699   end
 700
 701   private
 702
 703   def assert_html(richtext, &block)
 704     html = richtext.to_html
 705     assert_predicate html, :html_safe?
 706     root = Nokogiri::HTML::DocumentFragment.parse(html)
 707     assert_select root, "*" do
 708       yield block
 709     end
 710   end
 711 end