Initial unit tests (using Mocha and Chai asserts).

src/datasource-zabbix/specs/datasource_specs.js

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+import {Datasource} from "../module";
+import Q from "q";
+
+describe('ZabbixDatasource', function() {
+  var ctx = {};
+
+  beforeEach(function() {
+    ctx.instanceSettings = {
+      jsonData: {
+        username: 'zabbix',
+        password: 'zabbix',
+        trends: false
+      }
+    };
+    ctx.$q = Q;
+    ctx.templateSrv = {};
+    ctx.alertSrv = {};
+    ctx.zabbixAPIService = function() {};
+    ctx.ZabbixCachingProxy = function() {};
+    ctx.QueryProcessor = function() {};
+    ctx.ds = new Datasource(ctx.instanceSettings, ctx.$q, ctx.templateSrv, ctx.alertSrv,
+                            ctx.zabbixAPIService, ctx.ZabbixCachingProxy, ctx.QueryProcessor);
+  });
+
+  describe('When querying data', function() {
+
+    it('should return an empty array when no targets are set', function(done) {
+      var options = {
+        targets: [],
+        range: {from: null, to: null}
+      };
+      ctx.ds.query(options).then(function(result) {
+        expect(result.data).to.have.length(0);
+        done();
+      });
+    });
+
+  });
+
+});