Add trend using tests. Use sinon for checking functions calls.

src/datasource-zabbix/specs/datasource_specs.js

@@ -1,15 +1,19 @@
 import {Datasource} from "../module";
 import Q from "q";
+import sinon from 'sinon';
+import _ from 'lodash';
 
 describe('ZabbixDatasource', function() {
   var ctx = {};
+  var defined = sinon.match.defined;
 
   beforeEach(function() {
     ctx.instanceSettings = {
       jsonData: {
         username: 'zabbix',
         password: 'zabbix',
-        trends: false
+        trends: true,
+        trendsFrom: '7d'
       }
     };
     ctx.$q = Q;
@@ -18,16 +22,32 @@ describe('ZabbixDatasource', function() {
     ctx.zabbixAPIService = function() {};
     ctx.ZabbixCachingProxy = function() {};
     ctx.QueryProcessor = function() {};
+
     ctx.ds = new Datasource(ctx.instanceSettings, ctx.$q, ctx.templateSrv, ctx.alertSrv,
                             ctx.zabbixAPIService, ctx.ZabbixCachingProxy, ctx.QueryProcessor);
+
+    ctx.ds.replaceTemplateVars = function(str) {
+      return str;
+    };
   });
 
   describe('When querying data', function() {
+    ctx.options = {
+      targets: [
+        {
+          group: {filter: ""},
+          host: {filter: ""},
+          application: {filter: ""},
+          item: {filter: ""}
+        }
+      ],
+      range: {from: 'now-7d', to: 'now'}
+    };
 
     it('should return an empty array when no targets are set', function(done) {
       var options = {
         targets: [],
-        range: {from: null, to: null}
+        range: {from: 'now-6h', to: 'now'}
       };
       ctx.ds.query(options).then(function(result) {
         expect(result.data).to.have.length(0);
@@ -35,6 +55,38 @@ describe('ZabbixDatasource', function() {
       });
     });
 
+    it('should use trends if it enabled and time more than trendsFrom', function(done) {
+      var ranges = ['now-7d', 'now-168h', 'now-1M', 'now-1y'];
+
+      _.forEach(ranges, range => {
+        ctx.options.range.from = range;
+        ctx.ds.queryNumericData = sinon.spy();
+        ctx.ds.query(ctx.options);
+
+        // Check that useTrends options is true
+        expect(ctx.ds.queryNumericData)
+          .to.have.been.calledWith(defined, defined, defined, true);
+      });
+
+      done();
+    });
+
+    it('shouldnt use trends if it enabled and time less than trendsFrom', function(done) {
+      var ranges = ['now-6d', 'now-167h', 'now-1h', 'now-30m', 'now-30s'];
+
+      _.forEach(ranges, range => {
+        ctx.options.range.from = range;
+        ctx.ds.queryNumericData = sinon.spy();
+        ctx.ds.query(ctx.options);
+
+        // Check that useTrends options is false
+        expect(ctx.ds.queryNumericData)
+          .to.have.been.calledWith(defined, defined, defined, false);
+      });
+
+      done();
+    });
+
   });
 
 });