Add unit test

Author: dshanske

tests/templates/person-tag.html

@@ -0,0 +1,4 @@
+<span class="h-entry">
+  <a class="u-category" href="http://example.com/webmention/target/placeholder">Homepage</a><a class="u-url" href="/"></a>
+  <span class="h-card p-name">Test Person</span>
+</span>

tests/templates/person-tag.json

@@ -0,0 +1,7 @@
+{
+  "comment_author": "person-tag",
+  "comment_author_url": "http://example.com/webmention/target/placeholder",
+  "comment_meta": {
+    "semantic_linkbacks_type": "tag"
+  }
+}