Add tests for includes

test/fixtures/INCLUDES.md

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+# Beautiful chapter
+
+Here is a nice included snippet :
+
+```c
+{{ included.c }}
+```
+
+----
+
+An exercise using includes
+
+```c
+{{ included.c }}
+
+Remove this extra code at the end
+```
+
+```c
+{{ included.c }}
+```
+
+```c
+{{ included.c }}
+
+This validation code is wrong but who cares ?
+```
+
+----

test/fixtures/included.c

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+#include <stdio.h>
+
+int main(int argc, char *argv[]) {
+    printf("All is well\n");
+
+    return 0;
+}

test/includes.js

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+var fs = require('fs');
+var path = require('path');
+var assert = require('assert');
+
+var page = require('../').parse.page;
+
+var FIXTURES_DIR = path.join(__dirname, './fixtures/');
+
+function loadPage (name, options) {
+    var CONTENT = fs.readFileSync(FIXTURES_DIR + name + '.md', 'utf8');
+    return page(CONTENT, options);
+}
+
+
+describe('Code includes', function() {
+
+    var LEXED = loadPage('INCLUDES', {
+        'dir': FIXTURES_DIR,
+    });
+
+    var INCLUDED_C = fs.readFileSync(path.join(FIXTURES_DIR, 'included.c'), 'utf8');
+
+    it('should work for snippets', function() {
+        assert.equal(LEXED[0].type, 'normal');
+        // Has replaced include
+        assert.equal(
+            LEXED[0].content.indexOf('{{ included.c }}'),
+            -1
+        );
+    });
+
+    it('should work for exercises', function() {
+        assert.equal(LEXED[1].type, 'exercise');
+
+        // Solution is trimmed version of source
+        assert.equal(LEXED[1].code.solution, INCLUDED_C.trim());
+    });
+});