allow pages to specify different templates

tests/functional_tests.py

@@ -193,3 +193,13 @@ def test_setting_selected_style_includes_cookie(client):
     assert b'dark.css' in response.data
     assert b'light.css' not in response.data
     assert style_cookie.value == 'dark'
+
+
+def test_pages_can_supply_alternate_templates(client):
+    """Test that pages can supply templates other than the default."""
+    response = client.get('/')
+    assert b'class="site-wrap"' in response.data
+    assert b'class="wide-site-wrap"' not in response.data
+    response = client.get('/custom-template')
+    assert b'class="site-wrap"' not in response.data
+    assert b'class="wide-site-wrap"' in response.data

tests/instance/pages/custom-template.md

@@ -0,0 +1,3 @@
+Template:           base-wide.html
+
+testttttttttt