Make test-history generator create pages for individual suites

This makes it easier to determine which tests cause particular suites to
fail.

All static HTML pages are now generated by one invocation of gen_html.py.

- make index include good/flake/fail numbers for each link
- consistently use % for string interpolation

hack/jenkins/test-history/gen_html_test.py

@@ -0,0 +1,73 @@
+#!/usr/bin/env python
+
+# Copyright 2016 The Kubernetes Authors All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Tests for gen_html."""
+
+import json
+import os
+import shutil
+import tempfile
+import unittest
+
+import gen_html
+
+TEST_DATA = {
+  "test1":
+      {"kubernetes-release": [{"build": 3, "failed": False, "time": 3.52},
+                              {"build": 4, "failed": True, "time": 63.21}],
+       "kubernetes-debug": [{"build": 5, "failed": False, "time": 7.56},
+                            {"build": 6, "failed": False, "time": 8.43}],
+      },
+  "test2":
+      {"kubernetes-debug": [{"build": 6, "failed": True, "time": 3.53}]},
+}
+
+class GenHtmlTest(unittest.TestCase):
+    def gen_html(self, *args):
+        return gen_html.gen_html(TEST_DATA, *args)[0]
+
+    def testGenHtml(self):
+        html = self.gen_html('')
+        self.assertIn("test1", html)
+        self.assertIn("test2", html)
+        self.assertIn("release", html)
+        self.assertIn("debug", html)
+
+    def testGenHtmlFilter(self):
+        html = self.gen_html('release')
+        self.assertIn("release", html)
+        self.assertIn('skipped">\ntest2', html)
+        self.assertNotIn("debug", html)
+
+    def testGenHtmlFilterExact(self):
+        html = self.gen_html('release', True)
+        self.assertNotIn('debug', html)
+
+    def testMain(self):
+        temp_dir = tempfile.mkdtemp(prefix='kube-test-hist-')
+        try:
+            tests_json = os.path.join(temp_dir, 'tests.json')
+            with open(tests_json, 'w') as f:
+                json.dump(TEST_DATA, f)
+            gen_html.main(['--suites', '--prefixes', ',rel,deb',
+                           '--output-dir', temp_dir, '--input', tests_json])
+            for page in ('index', 'suite-kubernetes-debug', 'tests', 'tests-rel', 'tests-deb'):
+                self.assertTrue(os.path.exists('%s/%s.html' % (temp_dir, page)))
+        finally:
+            shutil.rmtree(temp_dir)
+
+if __name__ == '__main__':
+    unittest.main()