Add more tests

+ a benchmark case

benchmark/samples/inline-links-nested.md

@@ -9,3 +9,5 @@ Invalid links:
 [[[[[[[[[
 
 [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [ [
+
+![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![![

test/fixtures/remarkable/regression.txt

@@ -0,0 +1,19 @@
+
+Regression tests for link backtracking optimizations:
+
+.
+[[some unrelated text [link]
+
+[link]: foo
+.
+<p>[[some unrelated text <a href="foo">link</a></p>
+.
+
+.
+[[some unrelated text [[link]]
+
+[[link]]: foo
+.
+<p>[[some unrelated text <a href="foo">[link]</a></p>
+.
+

test/fixtures/remarkable/strikeout.txt

@@ -2,4 +2,66 @@
 ~~Strikeout~~
 .
 <p><del>Strikeout</del></p>
-.
+.
+
+
+These are not strikeouts, you have to use exactly two "~~":
+.
+x ~~~foo~~~
+
+x ~~foo~~~
+
+x ~~~foo~~
+.
+<p>x ~~~foo~~~</p>
+<p>x ~~foo~~~</p>
+<p>x ~~~foo~~</p>
+.
+
+Strikeouts have the same priority as emphases:
+
+.
+**~~test**~~
+
+~~**test~~**
+.
+<p><strong>~~test</strong>~~</p>
+<p><del>**test</del>**</p>
+.
+
+Strikeouts have the same priority as emphases with respect to links:
+.
+[~~link]()~~
+
+~~[link~~]()
+.
+<p><a href="">~~link</a>~~</p>
+<p>~~<a href="">link~~</a></p>
+.
+
+Strikeouts have the same priority as emphases with respect to backticks:
+.
+~~`code~~`
+
+`~~code`~~
+.
+<p>~~<code>code~~</code></p>
+<p><code>~~code</code>~~</p>
+.
+
+Nested strikeouts:
+.
+~~foo ~~bar~~ baz~~
+
+~~f **o ~~o b~~ a** r~~
+.
+<p><del>foo <del>bar</del> baz</del></p>
+<p><del>f <strong>o <del>o b</del> a</strong> r</del></p>
+.
+
+Should not have a whitespace between text and "~~":
+.
+foo ~~ bar ~~ baz
+.
+<p>foo ~~ bar ~~ baz</p>
+.