fix sumSeries() function, closes #286

dist/datasource-zabbix/specs/timeseries_specs.js

@@ -0,0 +1,34 @@
+// import _ from 'lodash';
+import ts from '../timeseries';
+
+describe('timeseries processing functions', () => {
+
+  describe('sumSeries()', () => {
+    it('should properly sum series', (done) => {
+      let series = [
+        [[0, 1], [1, 2], [1, 3]],
+        [[2, 1], [3, 2], [4, 3]]
+      ];
+
+      let expected = [[2, 1], [4, 2], [5, 3]];
+
+      let result = ts.sumSeries(series);
+      expect(result).to.eql(expected);
+      done();
+    });
+
+    it('should properly sum series with nulls', (done) => {
+      // issue #286
+      let series = [
+        [[1, 1], [1, 2], [1, 3]],
+        [[3, 2], [4, 3]]
+      ];
+
+      let expected = [[1, 1], [4, 2], [5, 3]];
+
+      let result = ts.sumSeries(series);
+      expect(result).to.eql(expected);
+      done();
+    });
+  });
+});