Add MD032 with tests, improve infrastructure.

test/lists_without_blank_lines.md

@@ -0,0 +1,75 @@
+* list (on first line)
+
+text
+
+* list
+
+text
+* list {MD032}
+text
++ list {MD032}
+text
+- list {MD032}
+text
+1. list {MD032}
+text
+
+* list
+* list {MD032}
+text
+
+text
+10. list {MD032}
+20. list
+
+text
+
+* list
+  * list
+    * list
+
+text
+
+* list
+  with hanging indent
+  * list
+    with hanging indent
+* list
+  with hanging indent
+
+Note: list without hanging indent violates MD032
+
+* list
+
+  item with blank lines
+
+* list
+
+  item with blank lines
+
+text
+
+```js
+/*
+ * code block
+ * not a list
+ */
+```
+
+text
+
+* list {MD032}
+``` {MD031}
+code
+```
+
+text
+
+```
+code
+``` {MD031}
+* list {MD032}
+
+text
+
+* list (on last line without newline)