Add MD040 with tests.

test/break-all-the-rules.md

@@ -46,6 +46,6 @@ Note: Can not break MD025 and MD002 in the same file
 1. list
 2. list {MD029}
 
-```
+```js
 ``` {MD031}
 * list {MD032}

test/code_block_dollar.md

@@ -29,5 +29,5 @@ The following code block doesn't have any dollar signs, and shouldn't fire:
 The following (fenced) code block doesn't have any content at all, and
 shouldn't fire:
 
-```
+```bash
 ```

test/fenced_code_blocks.md

@@ -19,3 +19,9 @@ echo "World"
 ~~~
 
 None of the above should trigger any heading related rules.
+
+```
+Code block without a language specifier
+```
+
+{MD040:23}

test/fenced_code_without_blank_lines.json

@@ -0,0 +1,4 @@
+{
+  "default": true,
+  "MD040": false
+}

test/lists_without_blank_lines.json

@@ -1,5 +1,6 @@
 {
   "default": true,
   "MD004": false,
-  "MD029": false
+  "MD029": false,
+  "MD040": false
 }

test/markdownlint-test.js

@@ -498,7 +498,7 @@ module.exports.badFileSync = function badFileSync(test) {
 };
 
 module.exports.readme = function readme(test) {
-  test.expect(92);
+  test.expect(95);
   var tagToRules = {};
   rules.forEach(function forRule(rule) {
     rule.tags.forEach(function forTag(tag) {
@@ -555,7 +555,7 @@ module.exports.readme = function readme(test) {
 };
 
 module.exports.doc = function doc(test) {
-  test.expect(143);
+  test.expect(147);
   fs.readFile("doc/Rules.md", shared.utf8Encoding,
     function readFile(err, contents) {
       test.ifError(err);