[Uptime] Add unit tests for QueryContext time calculation (elastic#56671

)

Add Unit tests for the QueryContext class that was missing testing. This would have caught elastic#56612

x-pack/legacy/plugins/uptime/server/lib/adapters/monitor_states/search/__tests__/query_context.test.ts

@@ -0,0 +1,83 @@
+/*
+ * 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 { QueryContext } from '../query_context';
+import { CursorPagination } from '../..';
+import { CursorDirection, SortOrder } from '../../../../../../common/graphql/types';
+
+describe(QueryContext, () => {
+  // 10 minute range
+  const rangeStart = '2019-02-03T19:06:54.939Z';
+  const rangeEnd = '2019-02-03T19:16:54.939Z';
+
+  const pagination: CursorPagination = {
+    cursorDirection: CursorDirection.AFTER,
+    sortOrder: SortOrder.DESC,
+  };
+
+  let qc: QueryContext;
+  beforeEach(() => (qc = new QueryContext({}, rangeStart, rangeEnd, pagination, null, 10)));
+
+  describe('dateRangeFilter()', () => {
+    const expectedRange = {
+      range: {
+        '@timestamp': {
+          gte: rangeStart,
+          lte: rangeEnd,
+        },
+      },
+    };
+    describe('when hasTimespan() is true', () => {
+      it('should create a date range filter including the timespan', async () => {
+        const mockHasTimespan = jest.fn();
+        mockHasTimespan.mockReturnValue(true);
+        qc.hasTimespan = mockHasTimespan;
+
+        expect(await qc.dateRangeFilter()).toEqual({
+          bool: {
+            filter: [
+              expectedRange,
+              {
+                bool: {
+                  should: [
+                    qc.timespanClause(),
+                    { bool: { must_not: { exists: { field: 'monitor.timespan' } } } },
+                  ],
+                },
+              },
+            ],
+          },
+        });
+      });
+    });
+
+    describe('when hasTimespan() is false', () => {
+      it('should only use the timestamp fields in the returned filter', async () => {
+        const mockHasTimespan = jest.fn();
+        mockHasTimespan.mockReturnValue(false);
+        qc.hasTimespan = mockHasTimespan;
+
+        expect(await qc.dateRangeFilter()).toEqual(expectedRange);
+      });
+    });
+  });
+
+  describe('timespanClause()', () => {
+    it('should always cover the last 5m', () => {
+      // 5m expected range between GTE and LTE in the response
+      // since timespan is hardcoded to 5m
+      expect(qc.timespanClause()).toEqual({
+        range: {
+          'monitor.timespan': {
+            // end date minus 5m
+            gte: new Date(Date.parse(rangeEnd) - 5 * 60 * 1000).toISOString(),
+            lte: rangeEnd,
+          },
+        },
+      });
+    });
+  });
+});