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

package.json

@@ -32,14 +32,16 @@
     "jsdom": "~3.1.2",
     "q": "~1.4.1",
     "chai": "~3.5.0",
+    "sinon-chai": "~2.8.0",
     "moment": "~2.14.1"
   },
   "dependencies": {
     "babel-plugin-transform-es2015-modules-systemjs": "^6.5.0",
     "babel-plugin-transform-es2015-for-of": "^6.6.0",
     "babel-preset-es2015": "^6.5.0",
-    "lodash": "~4.0.0",
-    "mocha": "^2.4.5"
+    "lodash": "^2.4.1",
+    "mocha": "^2.4.5",
+    "sinon": "~1.16.1"
   },
   "homepage": "http://grafana-zabbix.org"
 }

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();
+    });
+
   });
 
 });

src/datasource-zabbix/specs/modules/datemath.js

@@ -0,0 +1,111 @@
+import _ from 'lodash';
+import moment from 'moment';
+
+var units = ['y', 'M', 'w', 'd', 'h', 'm', 's'];
+
+export function parse(text, roundUp) {
+  if (!text) { return undefined; }
+  if (moment.isMoment(text)) { return text; }
+  if (_.isDate(text)) { return moment(text); }
+
+  var time;
+  var mathString = '';
+  var index;
+  var parseString;
+
+  if (text.substring(0, 3) === 'now') {
+    time = moment();
+    mathString = text.substring('now'.length);
+  } else {
+    index = text.indexOf('||');
+    if (index === -1) {
+      parseString = text;
+      mathString = ''; // nothing else
+    } else {
+      parseString = text.substring(0, index);
+      mathString = text.substring(index + 2);
+    }
+    // We're going to just require ISO8601 timestamps, k?
+    time = moment(parseString, moment.ISO_8601);
+  }
+
+  if (!mathString.length) {
+    return time;
+  }
+
+  return parseDateMath(mathString, time, roundUp);
+}
+
+export function isValid(text) {
+  var date = parse(text);
+  if (!date) {
+    return false;
+  }
+
+  if (moment.isMoment(date)) {
+    return date.isValid();
+  }
+
+  return false;
+}
+
+export function parseDateMath(mathString, time, roundUp) {
+  var dateTime = time;
+  var i = 0;
+  var len = mathString.length;
+
+  while (i < len) {
+    var c = mathString.charAt(i++);
+    var type;
+    var num;
+    var unit;
+
+    if (c === '/') {
+      type = 0;
+    } else if (c === '+') {
+      type = 1;
+    } else if (c === '-') {
+      type = 2;
+    } else {
+      return undefined;
+    }
+
+    if (isNaN(mathString.charAt(i))) {
+      num = 1;
+    } else if (mathString.length === 2) {
+      num = mathString.charAt(i);
+    } else {
+      var numFrom = i;
+      while (!isNaN(mathString.charAt(i))) {
+        i++;
+        if (i > 10) { return undefined; }
+      }
+      num = parseInt(mathString.substring(numFrom, i), 10);
+    }
+
+    if (type === 0) {
+      // rounding is only allowed on whole, single, units (eg M or 1M, not 0.5M or 2M)
+      if (num !== 1) {
+        return undefined;
+      }
+    }
+    unit = mathString.charAt(i++);
+
+    if (!_.contains(units, unit)) {
+      return undefined;
+    } else {
+      if (type === 0) {
+        if (roundUp) {
+          dateTime.endOf(unit);
+        } else {
+          dateTime.startOf(unit);
+        }
+      } else if (type === 1) {
+        dateTime.add(num, unit);
+      } else if (type === 2) {
+        dateTime.subtract(num, unit);
+      }
+    }
+  }
+  return dateTime;
+}

src/datasource-zabbix/specs/test-main.js

@@ -4,6 +4,9 @@
 import prunk from 'prunk';
 import {jsdom} from 'jsdom';
 import chai from 'chai';
+import sinon from 'sinon';
+import sinonChai from 'sinon-chai';
+import * as dateMath from './modules/datemath';
 
 // Mock angular module
 var angularMocks = {
@@ -17,7 +20,9 @@ var angularMocks = {
 };
 
 var datemathMock = {
-  parse: function() {}
+  parse: dateMath.parse,
+  parseDateMath: dateMath.parseDateMath,
+  isValid: dateMath.isValid
 };
 
 // Mock Grafana modules that are not available outside of the core project
@@ -39,5 +44,6 @@ global.Node = window.Node;
 
 // Setup Chai
 chai.should();
+chai.use(sinonChai);
 global.assert = chai.assert;
 global.expect = chai.expect;