diff --git a/tests/data/inline_link_title.html b/tests/data/inline_link_title.html
new file mode 100644
index 0000000..70e589a
--- /dev/null
+++ b/tests/data/inline_link_title.html
@@ -0,0 +1 @@
+<p><a href="http://example.com" title="Title">single quotes</a> and <a href="http://example.com" title="Title">double quotes</a></p>
\ No newline at end of file
diff --git a/tests/data/inline_link_title.md b/tests/data/inline_link_title.md
new file mode 100644
index 0000000..162b832
--- /dev/null
+++ b/tests/data/inline_link_title.md
@@ -0,0 +1 @@
+[single quotes](http://example.com 'Title') and [double quotes](http://example.com "Title")
\ No newline at end of file
diff --git a/tests/data/reference_title.html b/tests/data/reference_title.html
index 70e589a..8f2be94 100644
--- a/tests/data/reference_title.html
+++ b/tests/data/reference_title.html
@@ -1 +1,2 @@
-<p><a href="http://example.com" title="Title">single quotes</a> and <a href="http://example.com" title="Title">double quotes</a></p>
\ No newline at end of file
+<p><a href="http://example.com" title="example title">double quotes</a> and <a href="http://example.com" title="example title">single quotes</a> and <a href="http://example.com" title="example title">parentheses</a></p>
+<p>[invalid title]: <a href="http://example.com">http://example.com</a> example title</p>
\ No newline at end of file
diff --git a/tests/data/reference_title.md b/tests/data/reference_title.md
index 162b832..43cb217 100644
--- a/tests/data/reference_title.md
+++ b/tests/data/reference_title.md
@@ -1 +1,6 @@
-[single quotes](http://example.com 'Title') and [double quotes](http://example.com "Title")
\ No newline at end of file
+[double quotes] and [single quotes] and [parentheses]
+
+[double quotes]: http://example.com "example title"
+[single quotes]: http://example.com 'example title'
+[parentheses]: http://example.com (example title)
+[invalid title]: http://example.com example title
\ No newline at end of file