Add basic infrastructure, MD031, and test.

test/markdownlint-test.js

@@ -0,0 +1,36 @@
+"use strict";
+
+var fs = require("fs");
+var path = require("path");
+var markdownlint = require("../lib/markdownlint");
+
+function createTestForFile(file) {
+  return function(test) {
+    test.expect(1);
+    var contents = fs.readFileSync(file, { encoding: "utf8" });
+    var lines = contents.split(/\r\n|\n/g);
+    var results = {};
+    lines.forEach(function(line, lineNum) {
+      var match = line.match(/\{(MD\d+)(?::(\d+))?\}/);
+      if (match) {
+        var rule = match[1];
+        var lines = results[rule] || [];
+        lines.push(lineNum + 1);
+        results[rule] = lines;
+      }
+    });
+    var actual = markdownlint({
+      files: [ file ]
+    });
+    var expected = {};
+    expected[file] = results;
+    test.deepEqual(actual, expected, "Line numbers are not correct.");
+    test.done();
+  };
+}
+
+fs.readdirSync(__dirname).forEach(function(file) {
+  if (file.match(/\.md$/)) {
+    module.exports[file] = createTestForFile(path.join(__dirname, file));
+  }
+});