Add basic page tests

test/fixtures/PAGE.MD

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+# Python basics
+
+Python is a nice language, you can add stuff. Bla bla bla.
+
+Lets jump into an exercise :
+
+---
+
+It's dead simple, `c` must be the sum of `a` and `b`
+
+```py
+a = 1
+b = 2
+```
+
+```py
+a = 1
+b = 2
+c = a + b
+```
+
+```py
+assert(c, 3)
+```
+
+---
+
+Some more nice content ....
+
+[Cool stuff](http://gitbook.io)

test/page.js

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+var fs = require('fs');
+var path = require('path');
+var assert = require('assert');
+
+var page = require('../lib/page');
+
+
+var CONTENT = fs.readFileSync(path.join(__dirname, './fixtures/PAGE.md'), 'utf8');
+var LEXED = page(CONTENT);
+
+describe('Page parsing', function() {
+    it('should detection sections', function() {
+        assert.equal(LEXED.length, 3);
+    });
+});