Add system test for global filtering in Metricbeat

metricbeat/tests/system/test_filtering.py

@@ -0,0 +1,42 @@
+import re
+import sys
+import metricbeat
+import unittest
+
+@unittest.skipUnless(re.match("(?i)win|linux|darwin|openbsd", sys.platform), "os")
+class GlobalFiltering(metricbeat.BaseTest):
+
+    def test_drop_fields(self):
+
+        self.render_config_template(
+            modules=[{
+                "name": "system",
+                "metricsets": ["cpu"],
+                "period": "5s"
+            }],
+            drop_fields={
+                "condition": "range.system.cpu.system_p.lt: 0.1",
+                "fields": ["system.cpu.load"],
+            },
+        )
+        proc = self.start_beat()
+        self.wait_until(lambda: self.output_lines() > 0)
+        proc.check_kill_and_wait()
+
+        output = self.read_output_json()
+        self.assertEqual(len(output), 1)
+        evt = output[0]
+        self.assert_fields_are_documented(evt)
+
+        print(evt)
+        print(evt.keys())
+        self.assertItemsEqual([
+            'beat', '@timestamp', 'system', 'module',
+            'rtt', 'type', 'metricset'
+        ], evt.keys())
+        cpu = evt["system"]["cpu"]
+        print(cpu.keys())
+        self.assertItemsEqual([
+            "system_p", "user_p", "softirq", "iowait", "system",
+            "idle", "user", "irq", "steal", "nice"
+        ], cpu.keys())