Prism code rendering

test/renderer.test.js

@@ -7,6 +7,9 @@ const dataDir = 'test_data';
 const file = path.join(dataDir, 'test.md');
 
 const config = {
+  'modules': {
+    'prism': true,
+  },
   'showdown': {
     'simplifiedAutoLink': true,
     'smartIndentationFix': true
@@ -50,4 +53,44 @@ test('custom rules', (done) => {
     expect(html).toBe('<p><a href="http://www.google.com">www.google.com</a></p>');
     done();
   });
+});
+
+test('no prism', (done) => {
+  config['modules']['prism'] = false;
+  fs.writeFileSync(file, '```python\nprint("hello")\n```\n\n```python\nprint("hello")\n```');
+  renderer.render(file, (err, html) => {
+    expect(err).toBeNull();
+    expect(html).toBe('<pre><code class="python language-python">print("hello")\n</code></pre>\n<pre><code class="python language-python">print("hello")\n</code></pre>');
+    config['modules']['prism'] = true;
+    done();
+  });
+});
+
+test('prism correct', (done) => {
+  fs.writeFileSync(file, '```python\nprint("hello")\n```');
+  renderer.render(file, (err, html) => {
+    expect(err).toBeNull();
+    expect(html).not.toBe('<pre><code class="python language-python">print("hello")\n</code></pre>');
+    expect(html.indexOf('<pre><code class="python language-python">')).toBe(0);
+    done();
+  });
+});
+
+test('prism invalid lang', (done) => {
+  fs.writeFileSync(file, '```pythdon\nprint("hello")\n```');
+  renderer.render(file, (err, html) => {
+    expect(err).toBeNull();
+    expect(html).not.toBe('<pre><code class="pythdon language-pythdon">print("hello")\n</code></pre>');
+    expect(html.indexOf('<pre><code class="pythdon language-pythdon">')).toBe(0);
+    done();
+  });
+});
+
+test('prism mutliple code blocks', (done) => {
+  fs.writeFileSync(file, '```python\n\n```\n\n```python\n\n```');
+  renderer.render(file, (err, html) => {
+    expect(err).toBeNull();
+    expect(html).toBe('<pre><code class="python language-python"></code></pre>\n<pre><code class="python language-python"></code></pre>');
+    done();
+  });
 });