Revert of Replace ValueSetOutputFormatter with HistogramSetJsonOutputFormatter.

telemetry/telemetry/internal/results/valueset_output_formatter_unittest.py

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+import json
+import os
+import tempfile
+import unittest
+
+from telemetry.internal.results import valueset_output_formatter
+from telemetry.internal.results import page_test_results
+
+
+class ValueSetOutputFormatterTest(unittest.TestCase):
+
+  def setUp(self):
+    self.output_file_path = tempfile.mkstemp()[1]
+
+  def tearDown(self):
+    try:
+      os.remove(self.output_file_path)
+    except OSError:
+      pass
+
+  def test_basic_summary(self):
+    sample = {
+        'name': 'a',
+        'guid': '42',
+        'description': 'desc',
+        'important': False,
+        'diagnostics': [],
+        'type': 'numeric',
+        'numeric': {
+            'unit': 'n%',
+            'type': 'scalar',
+            'value': 42
+        }
+    }
+
+    results = page_test_results.PageTestResults()
+    results.value_set.extend([sample])
+
+    with open(self.output_file_path, 'w') as output_file:
+      formatter = valueset_output_formatter.ValueSetOutputFormatter(output_file)
+      formatter.Format(results)
+
+    written_data = json.load(open(self.output_file_path))
+    self.assertEqual([sample], written_data)
+