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_hosts => ["replace-me.example.com"], :linkify_hosts_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_hosts => ["replace-me.example.com"], :linkify_hosts_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_hosts => ["replace-me.example.com"], :linkify_hosts_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_hosts => ["replace-me.example.com"], :linkify_hosts_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_hosts => ["replace-me.example.com"], :linkify_hosts_replacement => nil) 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_wiki_hosts => ["replace-me-wiki.example.com"], :linkify_wiki_hosts_replacement => "wiki.example.com",
 278                   :linkify_wiki_optional_path_prefix => "^/wiki(?=/[A-Z])") do
 279       r = RichText.new("text", "foo https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal bar")
 280       assert_html r do
 281         assert_dom "a", :count => 1, :text => "wiki.example.com/Tag:surface%3Dmetal" do
 282           assert_dom "> @href", "https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal"
 283           assert_dom "> @rel", "nofollow noopener noreferrer"
 284         end
 285       end
 286     end
 287   end
 288
 289   def test_text_to_html_linkify_wiki_replace_prefix_undefined
 290     with_settings(:linkify_wiki_hosts => ["replace-me-wiki.example.com"], :linkify_wiki_hosts_replacement => "wiki.example.com",
 291                   :linkify_wiki_optional_path_prefix => nil) do
 292       r = RichText.new("text", "foo https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal bar")
 293       assert_html r do
 294         assert_dom "a", :count => 1, :text => "wiki.example.com/wiki/Tag:surface%3Dmetal" do
 295           assert_dom "> @href", "https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal"
 296           assert_dom "> @rel", "nofollow noopener noreferrer"
 297         end
 298       end
 299     end
 300   end
 301
 302   def test_text_to_html_linkify_wiki_replace_undefined_prefix
 303     with_settings(:linkify_wiki_hosts => ["replace-me-wiki.example.com"], :linkify_wiki_hosts_replacement => nil,
 304                   :linkify_wiki_optional_path_prefix => "^/wiki(?=/[A-Z])") do
 305       r = RichText.new("text", "foo https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal bar")
 306       assert_html r do
 307         assert_dom "a", :count => 1, :text => "https://replace-me-wiki.example.com/Tag:surface%3Dmetal" do
 308           assert_dom "> @href", "https://replace-me-wiki.example.com/wiki/Tag:surface%3Dmetal"
 309           assert_dom "> @rel", "nofollow noopener noreferrer"
 310         end
 311       end
 312     end
 313   end
 314
 315   def test_text_to_html_linkify_wiki_replace_prefix_no_match
 316     with_settings(:linkify_wiki_hosts => ["replace-me-wiki.example.com"], :linkify_wiki_hosts_replacement => "wiki.example.com",
 317                   :linkify_wiki_optional_path_prefix => "^/wiki(?=/[A-Z])") do
 318       r = RichText.new("text", "foo https://replace-me-wiki.example.com/wiki/w bar")
 319       assert_html r do
 320         assert_dom "a", :count => 1, :text => "wiki.example.com/wiki/w" do
 321           assert_dom "> @href", "https://replace-me-wiki.example.com/wiki/w"
 322           assert_dom "> @rel", "nofollow noopener noreferrer"
 323         end
 324       end
 325     end
 326   end
 327
 328   def test_text_to_html_linkify_recognize_wiki
 329     with_settings(:linkify_wiki_hosts => ["replace-me-wiki.example.com"], :linkify_wiki_hosts_replacement => "wiki.example.com",
 330                   :linkify_wiki_optional_path_prefix => "^/wiki(?=/[A-Z])") do
 331       r = RichText.new("text", "foo wiki.example.com/Tag:surface%3Dmetal bar")
 332       assert_html r do
 333         assert_dom "a", :count => 1, :text => "wiki.example.com/Tag:surface%3Dmetal" do
 334           assert_dom "> @href", "http://replace-me-wiki.example.com/Tag:surface%3Dmetal"
 335           assert_dom "> @rel", "nofollow noopener noreferrer"
 336         end
 337       end
 338     end
 339   end
 340
 341   def test_text_to_html_linkify_idempotent
 342     with_settings(:linkify_hosts => ["test.host"], :linkify_hosts_replacement => "test.host") do
 343       t0 = "foo https://test.host/way/123456789 bar"
 344
 345       r1 = RichText.new("text", t0)
 346       t1 = Nokogiri::HTML.fragment(r1.to_html).text
 347
 348       r2 = RichText.new("text", t1)
 349       t2 = Nokogiri::HTML.fragment(r2.to_html).text
 350
 351       assert_equal t1, t2
 352     end
 353   end
 354
 355   def test_text_to_html_linkify_recognize_path
 356     with_settings(:linkify => { :detection_rules => [{ :patterns => ["@(?<username>\\w+)"], :path_template => "user/\\k<username>" }] }) do
 357       r = RichText.new("text", "foo @example bar")
 358       assert_html r do
 359         assert_dom "a", :count => 1, :text => "http://test.host/user/example" do
 360           assert_dom "> @href", "http://test.host/user/example"
 361           assert_dom "> @rel", "nofollow noopener noreferrer"
 362         end
 363       end
 364     end
 365   end
 366
 367   def test_text_to_html_linkify_recognize_path_no_partial_match
 368     with_settings(:linkify => { :detection_rules => [{ :patterns => ["@(?<username>\\w+)"], :path_template => "user/\\k<username>" }] }) do
 369       r = RichText.new("text", "foo example@example.com bar")
 370       assert_html r do
 371         assert_select "a", 0
 372       end
 373     end
 374   end
 375
 376   def test_text_to_html_linkify_recognize_wiki_path
 377     with_settings(:linkify => { :detection_rules => [{ :patterns => ["(?<key>[^\"?#<>/\\s]+)=(?<value>[^\"?#<>\\s]+)"], :path_template => "Tag:\\k<key>=\\k<value>", :host => "http://example.wiki" }] }) do
 378       r = RichText.new("text", "foo surface=metal bar")
 379       assert_html r do
 380         assert_dom "a", :count => 1, :text => "http://example.wiki/Tag:surface=metal" do
 381           assert_dom "> @href", "http://example.wiki/Tag:surface=metal"
 382           assert_dom "> @rel", "nofollow noopener noreferrer"
 383         end
 384       end
 385     end
 386     with_settings(:linkify => { :detection_rules => [{ :patterns => ["(?<key>[^\"?#<>/\\s]+)=\\*?"], :path_template => "Key:\\k<key>", :host => "http://example.wiki" }] }) do
 387       r = RichText.new("text", "foo surface=* bar")
 388       assert_html r do
 389         assert_dom "a", :count => 1, :text => "http://example.wiki/Key:surface" do
 390           assert_dom "> @href", "http://example.wiki/Key:surface"
 391           assert_dom "> @rel", "nofollow noopener noreferrer"
 392         end
 393       end
 394     end
 395   end
 396
 397   def test_text_to_html_linkify_openstreetmap_links
 398     with_settings(:server_url => "www.openstreetmap.org", :server_protocol => "https") do
 399       cases = {
 400         "https://www.openstreetmap.org/note/4655490" =>
 401           ["note/4655490", "https://www.openstreetmap.org/note/4655490"],
 402
 403         "https://www.openstreetmap.org/changeset/163353772" =>
 404           ["changeset/163353772", "https://www.openstreetmap.org/changeset/163353772"],
 405
 406         "https://www.openstreetmap.org/way/1249366504" =>
 407           ["way/1249366504", "https://www.openstreetmap.org/way/1249366504"],
 408
 409         "https://www.openstreetmap.org/way/1249366504/history" =>
 410           ["way/1249366504/history", "https://www.openstreetmap.org/way/1249366504/history"],
 411
 412         "https://www.openstreetmap.org/way/1249366504/history/2" =>
 413           ["way/1249366504/history/2", "https://www.openstreetmap.org/way/1249366504/history/2"],
 414
 415         "https://www.openstreetmap.org/node/12639964186" =>
 416           ["node/12639964186", "https://www.openstreetmap.org/node/12639964186"],
 417
 418         "https://www.openstreetmap.org/relation/7876483" =>
 419           ["relation/7876483", "https://www.openstreetmap.org/relation/7876483"],
 420
 421         "https://www.openstreetmap.org/user/aharvey" =>
 422           ["@aharvey", "https://www.openstreetmap.org/user/aharvey"],
 423
 424         "https://wiki.openstreetmap.org/wiki/Key:boundary" =>
 425           ["boundary=*", "https://wiki.openstreetmap.org/wiki/Key:boundary"],
 426
 427         "https://wiki.openstreetmap.org/wiki/Tag:boundary=place" =>
 428           ["boundary=place", "https://wiki.openstreetmap.org/wiki/Tag:boundary=place"],
 429
 430         "boundary=*" =>
 431           ["boundary=*", "https://wiki.openstreetmap.org/wiki/Key:boundary"],
 432
 433         "boundary=place" =>
 434           ["boundary=place", "https://wiki.openstreetmap.org/wiki/Tag:boundary=place"],
 435
 436         "node/12639964186" =>
 437           ["node/12639964186", "https://www.openstreetmap.org/node/12639964186"],
 438
 439         "node 12639964186" =>
 440           ["node/12639964186", "https://www.openstreetmap.org/node/12639964186"],
 441
 442         "n12639964186" =>
 443           ["node/12639964186", "https://www.openstreetmap.org/node/12639964186"],
 444
 445         "way/1249366504" =>
 446           ["way/1249366504", "https://www.openstreetmap.org/way/1249366504"],
 447
 448         "way 1249366504" =>
 449           ["way/1249366504", "https://www.openstreetmap.org/way/1249366504"],
 450
 451         "w1249366504" =>
 452           ["way/1249366504", "https://www.openstreetmap.org/way/1249366504"],
 453
 454         "relation/7876483" =>
 455           ["relation/7876483", "https://www.openstreetmap.org/relation/7876483"],
 456
 457         "relation 7876483" =>
 458           ["relation/7876483", "https://www.openstreetmap.org/relation/7876483"],
 459
 460         "r7876483" =>
 461           ["relation/7876483", "https://www.openstreetmap.org/relation/7876483"],
 462
 463         "changeset/163353772" =>
 464           ["changeset/163353772", "https://www.openstreetmap.org/changeset/163353772"],
 465
 466         "changeset 163353772" =>
 467           ["changeset/163353772", "https://www.openstreetmap.org/changeset/163353772"],
 468
 469         "note/4655490" =>
 470           ["note/4655490", "https://www.openstreetmap.org/note/4655490"],
 471
 472         "note 4655490" =>
 473           ["note/4655490", "https://www.openstreetmap.org/note/4655490"]
 474       }
 475
 476       cases.each do |input, (expected_text, expected_href)|
 477         r = RichText.new("text", input)
 478         assert_html r do
 479           assert_dom "a", :count => 1, :text => expected_text do
 480             assert_dom "> @href", expected_href
 481           end
 482         end
 483       end
 484     end
 485   end
 486
 487   def test_text_to_html_linkify_no_year_misinterpretation
 488     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.")
 489     assert_html r do
 490       assert_select "a", 0
 491     end
 492   end
 493
 494   def test_text_to_html_email
 495     r = RichText.new("text", "foo example@example.com bar")
 496     assert_html r do
 497       assert_select "a", 0
 498     end
 499   end
 500
 501   def test_text_to_html_escape
 502     r = RichText.new("text", "foo < bar & baz > qux")
 503     assert_html r do
 504       assert_select "p", "foo < bar & baz > qux"
 505     end
 506   end
 507
 508   def test_text_to_text
 509     r = RichText.new("text", "foo http://example.com/ bar")
 510     assert_equal "foo http://example.com/ bar", r.to_text
 511   end
 512
 513   def test_text_no_opengraph_properties
 514     r = RichText.new("text", "foo https://example.com/ bar")
 515     assert_nil r.image
 516     assert_nil r.image_alt
 517     assert_nil r.description
 518   end
 519
 520   def test_html_no_opengraph_properties
 521     r = RichText.new("html", "foo <a href='https://example.com/'>bar</a> baz")
 522     assert_nil r.image
 523     assert_nil r.image_alt
 524     assert_nil r.description
 525   end
 526
 527   def test_markdown_no_image
 528     r = RichText.new("markdown", "foo [bar](https://example.com/) baz")
 529     assert_nil r.image
 530     assert_nil r.image_alt
 531   end
 532
 533   def test_markdown_image
 534     r = RichText.new("markdown", "foo ![bar](https://example.com/image.jpg) baz")
 535     assert_equal "https://example.com/image.jpg", r.image
 536     assert_equal "bar", r.image_alt
 537   end
 538
 539   def test_markdown_first_image
 540     r = RichText.new("markdown", "foo ![bar1](https://example.com/image1.jpg) baz\nfoo ![bar2](https://example.com/image2.jpg) baz")
 541     assert_equal "https://example.com/image1.jpg", r.image
 542     assert_equal "bar1", r.image_alt
 543   end
 544
 545   def test_markdown_image_with_empty_src
 546     r = RichText.new("markdown", "![invalid]()")
 547     assert_nil r.image
 548     assert_nil r.image_alt
 549   end
 550
 551   def test_markdown_skip_image_with_empty_src
 552     r = RichText.new("markdown", "![invalid]() ![valid](https://example.com/valid.gif)")
 553     assert_equal "https://example.com/valid.gif", r.image
 554     assert_equal "valid", r.image_alt
 555   end
 556
 557   def test_markdown_html_image
 558     r = RichText.new("markdown", "<img src='https://example.com/img_element.png' alt='alt text here'>")
 559     assert_equal "https://example.com/img_element.png", r.image
 560     assert_equal "alt text here", r.image_alt
 561   end
 562
 563   def test_markdown_html_image_without_alt
 564     r = RichText.new("markdown", "<img src='https://example.com/img_element.png'>")
 565     assert_equal "https://example.com/img_element.png", r.image
 566     assert_nil r.image_alt
 567   end
 568
 569   def test_markdown_html_image_with_empty_src
 570     r = RichText.new("markdown", "<img src='' alt='forgot src'>")
 571     assert_nil r.image
 572     assert_nil r.image_alt
 573   end
 574
 575   def test_markdown_skip_html_image_with_empty_src
 576     r = RichText.new("markdown", "<img src='' alt='forgot src'> <img src='https://example.com/next_img_element.png' alt='have src'>")
 577     assert_equal "https://example.com/next_img_element.png", r.image
 578     assert_equal "have src", r.image_alt
 579   end
 580
 581   def test_markdown_html_image_without_src
 582     r = RichText.new("markdown", "<img alt='totally forgot src'>")
 583     assert_nil r.image
 584     assert_nil r.image_alt
 585   end
 586
 587   def test_markdown_skip_html_image_without_src
 588     r = RichText.new("markdown", "<img alt='totally forgot src'> <img src='https://example.com/next_img_element.png' alt='have src'>")
 589     assert_equal "https://example.com/next_img_element.png", r.image
 590     assert_equal "have src", r.image_alt
 591   end
 592
 593   def test_markdown_no_description
 594     r = RichText.new("markdown", "#Nope")
 595     assert_nil r.description
 596   end
 597
 598   def test_markdown_description
 599     r = RichText.new("markdown", "This is an article about something.")
 600     assert_equal "This is an article about something.", r.description
 601   end
 602
 603   def test_markdown_description_after_heading
 604     r = RichText.new("markdown", "#Heading\n\nHere starts the text.")
 605     assert_equal "Here starts the text.", r.description
 606   end
 607
 608   def test_markdown_description_after_image
 609     r = RichText.new("markdown", "![bar](https://example.com/image.jpg)\n\nThis is below the image.")
 610     assert_equal "This is below the image.", r.description
 611   end
 612
 613   def test_markdown_description_only_first_paragraph
 614     r = RichText.new("markdown", "This thing.\n\nMaybe also that thing.")
 615     assert_equal "This thing.", r.description
 616   end
 617
 618   def test_markdown_description_elements
 619     r = RichText.new("markdown", "*Something* **important** [here](https://example.com/).")
 620     assert_equal "Something important here.", r.description
 621   end
 622
 623   def test_markdown_html_description
 624     r = RichText.new("markdown", "<p>Can use HTML tags.</p>")
 625     assert_equal "Can use HTML tags.", r.description
 626   end
 627
 628   def test_markdown_description_max_length
 629     m = RichText::DESCRIPTION_MAX_LENGTH
 630     o = 3 # "...".length
 631
 632     r = RichText.new("markdown", "x" * m)
 633     assert_equal "x" * m, r.description
 634
 635     r = RichText.new("markdown", "y" * (m + 1))
 636     assert_equal "#{'y' * (m - o)}...", r.description
 637
 638     r = RichText.new("markdown", "*zzzzzzzzz*z" * ((m + 1) / 10.0).ceil)
 639     assert_equal "#{'z' * (m - o)}...", r.description
 640   end
 641
 642   def test_markdown_description_word_break_threshold_length
 643     m = RichText::DESCRIPTION_MAX_LENGTH
 644     t = RichText::DESCRIPTION_WORD_BREAK_THRESHOLD_LENGTH
 645     o = 3 # "...".length
 646
 647     r = RichText.new("markdown", "#{'x' * (t - o - 1)} #{'y' * (m - (t - o - 1) - 1)}")
 648     assert_equal "#{'x' * (t - o - 1)} #{'y' * (m - (t - o - 1) - 1)}", r.description
 649
 650     r = RichText.new("markdown", "#{'x' * (t - o - 1)} #{'y' * (m - (t - o - 1))}")
 651     assert_equal "#{'x' * (t - o - 1)} #{'y' * (m - (t - o - 1) - 4)}...", r.description
 652
 653     r = RichText.new("markdown", "#{'x' * (t - o)} #{'y' * (m - (t - o) - 1)}")
 654     assert_equal "#{'x' * (t - o)} #{'y' * (m - (t - o) - 1)}", r.description
 655
 656     r = RichText.new("markdown", "#{'x' * (t - o)} #{'y' * (m - (t - o))}")
 657     assert_equal "#{'x' * (t - o)}...", r.description
 658   end
 659
 660   def test_markdown_description_word_break_multiple_spaces
 661     m = RichText::DESCRIPTION_MAX_LENGTH
 662     t = RichText::DESCRIPTION_WORD_BREAK_THRESHOLD_LENGTH
 663     o = 3 # "...".length
 664
 665     r = RichText.new("markdown", "#{'x' * (t - o)}  #{'y' * (m - (t - o - 1))}")
 666     assert_equal "#{'x' * (t - o)}...", r.description
 667   end
 668
 669   private
 670
 671   def assert_html(richtext, &block)
 672     html = richtext.to_html
 673     assert_predicate html, :html_safe?
 674     root = Nokogiri::HTML::DocumentFragment.parse(html)
 675     assert_select root, "*" do
 676       yield block
 677     end
 678   end
 679 end