djot-0.1.0.0: test/code_blocks.test

```
```
code
  block
```
.
<pre><code>code
  block
</code></pre>
```

````
``` python
x = y + 3
```
.
<pre><code class="language-python">x = y + 3
</code></pre>
````

````
  ``` python
  if true:
    x = 3
  ```
.
<pre><code class="language-python">if true:
  x = 3
</code></pre>
````

````
``` not a code block ```
.
<p><code> not a code block </code></p>
````

````
``` not a code block
.
<p><code> not a code block</code></p>
````

````
```
hi
```
```
two
```
.
<pre><code>hi
</code></pre>
<pre><code>two
</code></pre>
````

Empty code block:

````
```
```
.
<pre><code></code></pre>
````