Fixed issue: Disqus comment is not created when library has no examples.

Modified test_libraries.py in order to test that all library examples compile successfully and that Disqus comments are created on library url pages and on examples.

tests/libraries/test_libraries.py

@@ -1,13 +1,47 @@
 from codebender_testing.config import LIBRARIES_TEST_LOGFILE
 from codebender_testing.utils import SeleniumTestCase
 
+GET_SKETCHES_SCRIPT = "return $('{selector}').map(function() {{ return this.href; }}).toArray();"
 
+GET_ALL_LIBRARIES_EXAMPLES_URLS_SCRIPT = """
+var librariesMap = {};
+var machineNameFilter = /.+\(\s(.+)\.h\s\)/;
+var accordionHeadings = $('#mycontainer').find('.accordion-heading');
+$.each(accordionHeadings, function (key, value) {{
+    var libraryName = $(value).text().trim();
+    if (machineNameFilter.test(libraryName)) {{
+        libraryName = libraryName.match(machineNameFilter)[1].trim();
+    }}
+    if (!librariesMap.hasOwnProperty(libraryName)) {{
+       librariesMap[libraryName] = [];
+    }}
+
+    var examples = $(value).parent().find('.accordion-body').find('li a');
+
+    $.each(examples, function (k, v) {{
+        var href = $(v).attr('href');
+        librariesMap[libraryName].push(href);
+    }});
+}});
+console.log(librariesMap);
+return librariesMap;
+"""
 class TestLibraryExamples(SeleniumTestCase):
 
     def test_compile_all_libraries(self):
-        """Tests that all library examples compile successfully."""
-        self.compile_all_sketches('/libraries', '.accordion li a',
-                                  compile_type='library',
-                                  iframe=False, project_view=True,
-                                  create_report=True, logfile=LIBRARIES_TEST_LOGFILE,
-                                  comment=True)
+        url = '/libraries'
+        self.open(url)
+
+        examples = self.execute_script(GET_SKETCHES_SCRIPT.format(selector='.accordion li a'), '$')
+        assert len(examples) > 0
+        libraries = self.execute_script(GET_SKETCHES_SCRIPT.format(selector='.library_link'), '$')
+        assert len(libraries) > 0
+        examples_libraries = examples + libraries
+
+        """Tests that all library examples compile successfully and comments on library url page and on its examples."""
+        library_examples_urls = self.execute_script(GET_ALL_LIBRARIES_EXAMPLES_URLS_SCRIPT, '$')
+
+        self.comment_compile_libraries_examples(examples_libraries, library_examples_urls,
+                                                compile_type='library', iframe=False,
+                                                project_view=True, create_report=True,
+                                                logfile=LIBRARIES_TEST_LOGFILE, comment=True)