test_github_backtick_syntax_for_code: Use files

Solves PEP 8 line too long errors

tests/fixtures/markdown/code.html

@@ -0,0 +1,6 @@
+<p>Here is some Python:</p>
+<div><pre><span class="kn">import</span> <span class="nn">os</span>
+
+<span class="k">def</span> <span class="nf">read</span><span class="p">(</span><span class="n">fn</span><span class="p">):</span>
+    <span class="k">return</span> <span class="nb">open</span><span class="p">(</span><span class="n">fn</span><span class="p">)</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
+</pre></div>

tests/fixtures/markdown/code.md

@@ -0,0 +1,8 @@
+Here is some Python:
+
+```python
+import os
+
+def read(fn):
+    return open(fn).read()
+```

tests/test_markdown.py

@@ -59,28 +59,6 @@ def test_a_tag_gets_nofollow():
     assert out in expected_htmls
 
 
-def test_github_backtick_syntax_for_code():
-    markdown_markup = """\
-Here is some Python:
-
-```python
-import os
-
-def read(fn):
-    return open(fn).read()
-```"""
-    out, rendered = render(markdown_markup)
-    expected_html = """\
-<p>Here is some Python:</p>
-<div><pre><span class="kn">import</span> <span class="nn">os</span>
-
-<span class="k">def</span> <span class="nf">read</span><span class="p">(</span><span class="n">fn</span><span class="p">):</span>
-    <span class="k">return</span> <span class="nb">open</span><span class="p">(</span><span class="n">fn</span><span class="p">)</span><span class="o">.</span><span class="n">read</span><span class="p">()</span>
-</pre></div>"""
-    assert rendered
-    assert out == expected_html
-
-
 def test_smart_strong():
     markdown_markup = 'Text with double__underscore__words.'
     out, rendered = render(markdown_markup)
@@ -89,6 +67,10 @@ def test_smart_strong():
     assert out == expected_html
 
 
+def test_github_backtick_syntax_for_code():
+    _do_test_with_files('code')
+
+
 def test_headings_and_paragraphs():
     _do_test_with_files('headings_and_paragraphs')