Add tests ensuring metric_query integrity

Author: Zacqary

x-pack/plugins/infra/server/lib/alerting/metric_threshold/lib/metric_query.test.ts

@@ -0,0 +1,59 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+import { MetricExpressionParams } from '../types';
+import { getElasticsearchMetricQuery } from './metric_query';
+
+describe("The Metric Threshold Alert's getElasticsearchMetricQuery", () => {
+  const expressionParams = {
+    metric: 'system.is.a.good.puppy.dog',
+    aggType: 'avg',
+    timeUnit: 'm',
+    timeSize: 1,
+  } as MetricExpressionParams;
+
+  const timefield = '@timestamp';
+  const groupBy = 'host.doggoname';
+
+  describe('when passed no filterQuery', () => {
+    const searchBody = getElasticsearchMetricQuery(expressionParams, timefield, groupBy);
+    test('includes a range filter', () => {
+      expect(
+        searchBody.query.bool.filter.find((filter) => filter.hasOwnProperty('range'))
+      ).toBeTruthy();
+    });
+
+    test('includes a metric field filter', () => {
+      expect(searchBody.query.bool.filter).toMatchObject(
+        expect.arrayContaining([{ exists: { field: 'system.is.a.good.puppy.dog' } }])
+      );
+    });
+  });
+
+  describe('when passed a filterQuery', () => {
+    const filterQuery =
+      // This is adapted from a real-world query that previously broke alerts
+      // We want to make sure it doesn't override any existing filters
+      '{"bool":{"filter":[{"bool":{"filter":[{"bool":{"must_not":[{"bool":{"should":[{"query_string":{"query":"bark*","fields":["host.name^1.0"],"type":"best_fields","default_operator":"or","max_determinized_states":10000,"enable_position_increments":true,"fuzziness":"AUTO","fuzzy_prefix_length":0,"fuzzy_max_expansions":50,"phrase_slop":0,"escape":false,"auto_generate_synonyms_phrase_query":true,"fuzzy_transpositions":true,"boost":1}}],"adjust_pure_negative":true,"minimum_should_match":"1","boost":1}}],"adjust_pure_negative":true,"boost":1}},{"bool":{"must_not":[{"bool":{"should":[{"query_string":{"query":"woof*","fields":["host.name^1.0"],"type":"best_fields","default_operator":"or","max_determinized_states":10000,"enable_position_increments":true,"fuzziness":"AUTO","fuzzy_prefix_length":0,"fuzzy_max_expansions":50,"phrase_slop":0,"escape":false,"auto_generate_synonyms_phrase_query":true,"fuzzy_transpositions":true,"boost":1}}],"adjust_pure_negative":true,"minimum_should_match":"1","boost":1}}],"adjust_pure_negative":true,"boost":1}}],"adjust_pure_negative":true,"boost":1}}],"adjust_pure_negative":true,"boost":1}}';
+
+    const searchBody = getElasticsearchMetricQuery(
+      expressionParams,
+      timefield,
+      groupBy,
+      filterQuery
+    );
+    test('includes a range filter', () => {
+      expect(
+        searchBody.query.bool.filter.find((filter) => filter.hasOwnProperty('range'))
+      ).toBeTruthy();
+    });
+
+    test('includes a metric field filter', () => {
+      expect(searchBody.query.bool.filter).toMatchObject(
+        expect.arrayContaining([{ exists: { field: 'system.is.a.good.puppy.dog' } }])
+      );
+    });
+  });
+});