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diff --git a/tests/node.d/fronius.chart.spec.js b/tests/node.d/fronius.chart.spec.js
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+++ b/tests/node.d/fronius.chart.spec.js
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+"use strict";
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+var netdata = require("../../node.d/node_modules/netdata");
+// remember: subject will be a singleton!
+var subject = require("../../node.d/fronius.node");
+
+var service = netdata.service({
+    name: "chart",
+    module: this
+});
+
+describe("fronius chart creation", function () {
+
+    var chartPrefix = "fronius_chart.";
+
+    beforeAll(function () {
+        // change this to enable debug log
+        netdata.options.DEBUG = false;
+    });
+
+    afterAll(function () {
+        deleteProperties(subject.charts)
+    });
+
+    it("should return a basic chart dimension", function () {
+        var result = subject.createBasicDimension("id", "name", 2);
+
+        expect(result.divisor).toBe(2);
+        expect(result.id).toBe("id");
+        expect(result.algorithm).toEqual(netdata.chartAlgorithms.absolute);
+        expect(result.multiplier).toBe(1);
+    });
+
+    it("should return the power chart definition", function () {
+        var suffix = "power";
+        var result = subject.getSitePowerChart(service, suffix);
+
+        expect(result.id).toBe(chartPrefix + suffix);
+        expect(result.units).toBe("W");
+        expect(result.type).toBe(netdata.chartTypes.area);
+        expect(result.family).toBe("power");
+        expect(result.context).toBe("fronius.power");
+        expect(result.dimensions[subject.powerGridId].name).toBe("grid");
+        expect(result.dimensions[subject.powerPvId].name).toBe("photovoltaics");
+        expect(result.dimensions[subject.powerAccuId].name).toBe("accumulator");
+        expect(Object.keys(result.dimensions).length).toBe(3);
+    });
+
+    it("should return the consumption chart definition", function () {
+        var suffix = "Load";
+        var result = subject.getSiteConsumptionChart(service, suffix);
+
+        expect(result.id).toBe(chartPrefix + suffix);
+        expect(result.units).toBe("W");
+        expect(result.type).toBe(netdata.chartTypes.area);
+        expect(result.family).toBe("consumption");
+        expect(result.context).toBe("fronius.consumption");
+        expect(Object.keys(result.dimensions).length).toBe(1);
+        expect(result.dimensions[subject.consumptionLoadId].name).toBe("load");
+    });
+
+    it("should return the autonomy chart definition", function () {
+        var suffix = "Autonomy";
+        var result = subject.getSiteAutonomyChart(service, suffix);
+
+        expect(result.id).toBe(chartPrefix + suffix);
+        expect(result.units).toBe("%");
+        expect(result.type).toBe(netdata.chartTypes.area);
+        expect(result.family).toBe("autonomy");
+        expect(result.context).toBe("fronius.autonomy");
+        expect(Object.keys(result.dimensions).length).toBe(3);
+        expect(result.dimensions[subject.autonomyId].name).toBe("autonomy");
+        expect(result.dimensions[subject.consumptionSelfId].name).toBe("self_consumption");
+    });
+
+    it("should return the energy today chart definition", function () {
+        var suffix = "Energy today";
+        var result = subject.getSiteEnergyTodayChart(service, suffix);
+
+        expect(result.id).toBe(chartPrefix + suffix);
+        expect(result.units).toBe("kWh");
+        expect(result.type).toBe(netdata.chartTypes.area);
+        expect(result.family).toBe("energy");
+        expect(result.context).toBe("fronius.energy.today");
+        expect(Object.keys(result.dimensions).length).toBe(1);
+        expect(result.dimensions[subject.energyTodayId].name).toBe("today");
+    });
+
+    it("should return the energy year chart definition", function () {
+        var suffix = "Energy year";
+        var result = subject.getSiteEnergyYearChart(service, suffix);
+
+        expect(result.id).toBe(chartPrefix + suffix);
+        expect(result.units).toBe("kWh");
+        expect(result.type).toBe(netdata.chartTypes.area);
+        expect(result.family).toBe("energy");
+        expect(result.context).toBe("fronius.energy.year");
+        expect(Object.keys(result.dimensions).length).toBe(1);
+        expect(result.dimensions[subject.energyYearId].name).toBe("year");
+    });
+
+    it("should return the inverter chart definition with a single numerical inverter", function () {
+        var inverters = {
+            "1": {}
+        };
+        var suffix = "numerical";
+        var result = subject.getInverterPowerChart(service, suffix, inverters);
+
+        expect(result.id).toBe(chartPrefix + suffix);
+        expect(result.units).toBe("W");
+        expect(result.type).toBe(netdata.chartTypes.stacked);
+        expect(result.family).toBe("inverters");
+        expect(result.context).toBe("fronius.inverter.output");
+        expect(Object.keys(result.dimensions).length).toBe(1);
+        expect(result.dimensions["1"].name).toBe("inverter_1");
+    });
+
+    it("should return the inverter chart definition with a single alphabetical inverter", function () {
+        var key = "Cellar";
+        var inverters = {
+            "Cellar": {}
+        };
+        var suffix = "alphabetical";
+        var result = subject.getInverterPowerChart(service, suffix, inverters);
+
+        expect(result.id).toBe(chartPrefix + suffix);
+        expect(result.units).toBe("W");
+        expect(result.type).toBe(netdata.chartTypes.stacked);
+        expect(result.family).toBe("inverters");
+        expect(result.context).toBe("fronius.inverter.output");
+        expect(Object.keys(result.dimensions).length).toBe(1);
+        expect(result.dimensions[key].name).toBe(key);
+    });
+
+    it("should return the inverter chart definition with multiple alphanumerical inverter", function () {
+        var alpha = "Cellar";
+        var numerical = 1;
+        var inverters = {
+            "Cellar": {},
+            "1": {}
+        };
+        var suffix = "alphanumerical";
+        var result = subject.getInverterPowerChart(service, suffix, inverters);
+
+        expect(result.id).toBe(chartPrefix + suffix);
+        expect(result.units).toBe("W");
+        expect(result.type).toBe(netdata.chartTypes.stacked);
+        expect(result.family).toBe("inverters");
+        expect(result.context).toBe("fronius.inverter.output");
+        expect(Object.keys(result.dimensions).length).toBe(2);
+        expect(result.dimensions[alpha].name).toBe(alpha);
+        expect(result.dimensions[numerical].name).toBe("inverter_" + numerical);
+    });
+
+    it("should return the same chart definition on second call for lazy loading", function () {
+        var first = subject.getSitePowerChart(service, "id");
+        var second = subject.getSitePowerChart(service, "id");
+
+        expect(first).toBe(second);
+    });
+});