Add hook for modifying summary section (#152)

Closes #109

README.rst

@@ -85,6 +85,20 @@ via the :code:`pytest_configure` hook:
   def pytest_configure(config):
       config._metadata['foo'] = 'bar'
 
+Additional summary information
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+You can edit the *Summary* section by using the :code:`pytest_html_results_summary` hook:
+
+.. code-block:: python
+
+   import pytest
+   from py.xml import html
+
+   @pytest.mark.optionalhook
+   def pytest_html_results_summary(prefix, summary, postfix):
+       prefix.extend([html.p("foo: bar")])
+
 Extra content
 ~~~~~~~~~~~~~
 

pytest_html/hooks.py

@@ -3,6 +3,10 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 
+def pytest_html_results_summary(prefix, summary, postfix):
+    """ Called before adding the summary section to the report """
+
+
 def pytest_html_results_table_header(cells):
     """ Called after building results table header. """
 

pytest_html/plugin.py

@@ -376,7 +376,7 @@ class HTMLReport(object):
         if self.rerun is not None:
             outcomes.append(Outcome('rerun', self.rerun))
 
-        summary = [html.h2('Summary'), html.p(
+        summary = [html.p(
             '{0} tests ran in {1:.2f} seconds. '.format(
                 numtests, suite_time_delta)),
             html.p('(Un)check the boxes to filter the results.',
@@ -423,7 +423,13 @@ class HTMLReport(object):
             onLoad='init()')
 
         body.extend(self._generate_environment(session.config))
-        body.extend(summary)
+
+        summary_prefix, summary_postfix = [], []
+        session.config.hook.pytest_html_results_summary(
+            prefix=summary_prefix, summary=summary, postfix=summary_postfix)
+        body.extend([html.h2('Summary')] + summary_prefix
+                    + summary + summary_postfix)
+
         body.extend(results)
 
         doc = html.html(head, body)

testing/test_pytest_html.py

@@ -229,6 +229,27 @@ class TestHTML:
         assert content not in html
         assert escaped in html
 
+    def test_custom_content_in_summary(self, testdir):
+        content_prefix = str(random.random())
+        content_summary = str(random.random())
+        content_suffix = str(random.random())
+        testdir.makeconftest("""
+            import pytest
+            from py.xml import html
+
+            @pytest.mark.optionalhook
+            def pytest_html_results_summary(prefix, summary, postfix):
+                prefix.append(html.p("prefix is {0}"))
+                summary.extend([html.p("extra summary is {1}")])
+                postfix.extend([html.p("postfix is {2}")])
+        """.format(content_prefix, content_summary, content_suffix))
+        testdir.makepyfile('def test_pass(): pass')
+        result, html = run(testdir)
+        assert result.ret == 0
+        assert len(re.findall(content_prefix, html)) == 1
+        assert len(re.findall(content_summary, html)) == 1
+        assert len(re.findall(content_suffix, html)) == 1
+
     def test_extra_html(self, testdir):
         content = str(random.random())
         testdir.makeconftest("""