Add initial intro test

memopol/tests/response_fixtures/NavigationPaneTest.test_intro.content

+<div id="intro">
+    <h1 class="text-center"><span class="glyphicon glyphicon-eye-open"></span><br/>Political memory</h1>
+    <p class="lead text-center hidden-xs">What is Memopol ?</p>
+    <p class="text-justify hidden-xs">Political Memory is a tool designed by La Quadrature du Net to help citizens reach their representative and track their voting records on issues related to fundamental freedoms online.</p>
+    <div class="container-fluid hidden-xs">
+        <div class="row">
+            <div class="pull-right">
+                <a class="btn btn-default">More on our blog</a>
+            </div>
+        </div>
+    </div>
+</div>
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memopol/tests/response_fixtures/NavigationPaneTest.test_intro.metadata

+{
+    "status_code": 200
+}
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memopol/tests/test_navigation_pane.py

+from django import test
+from responsediff.test import ResponseDiffTestMixin
+
+
+class NavigationPaneTest(ResponseDiffTestMixin, test.TestCase):
+    url = '/'
+
+    def selector_test(self, selector):
+        self.assertResponseDiffEmpty(test.Client().get(self.url), selector)
+
+    def test_intro(self):
+        self.selector_test('#intro')

templates/_base_intro.html

 {% load i18n %}
 
-<h1 class="text-center"><span class="glyphicon glyphicon-eye-open"></span><br/>{% trans "Political memory" %}</h1>
-<p class="lead text-center hidden-xs">{% trans "What is Memopol ?" %}</p>
-<p class="text-justify hidden-xs">{% trans "Political Memory is a tool designed by La Quadrature du Net to help citizens reach their representative and track their voting records on issues related to fundamental freedoms online." %}</p>
-<div class="container-fluid hidden-xs">
-    <div class="row">
-        <div class="pull-right">
-            <a class="btn btn-default">{% trans "More on our blog" %}</a>
+<div id="intro">
+    <h1 class="text-center"><span class="glyphicon glyphicon-eye-open"></span><br/>{% trans "Political memory" %}</h1>
+    <p class="lead text-center hidden-xs">{% trans "What is Memopol ?" %}</p>
+    <p class="text-justify hidden-xs">{% trans "Political Memory is a tool designed by La Quadrature du Net to help citizens reach their representative and track their voting records on issues related to fundamental freedoms online." %}</p>
+    <div class="container-fluid hidden-xs">
+        <div class="row">
+            <div class="pull-right">
+                <a class="btn btn-default">{% trans "More on our blog" %}</a>
+            </div>
         </div>
     </div>
-</div>
+</div>
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