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tests/power-calculation.test.ts

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+import { describe, it } from "node:test";
+import assert from "node:assert/strict";
+import {
+  calculateCurrentA,
+  calculateDemandPowerKw,
+  calculateInstalledPowerKw,
+} from "../src/domain/calculations/power-calculation.js";
+
+describe("power calculation", () => {
+  it("calculates installed power", () => {
+    const result = calculateInstalledPowerKw({
+      quantity: 4,
+      installedPowerPerUnitKw: 1.2,
+      demandFactor: 0.8,
+    });
+    assert.ok(Math.abs(result - 4.8) < 0.00001);
+  });
+
+  it("calculates demand power", () => {
+    const result = calculateDemandPowerKw({
+      quantity: 4,
+      installedPowerPerUnitKw: 1.2,
+      demandFactor: 0.8,
+    });
+    assert.ok(Math.abs(result - 3.84) < 0.00001);
+  });
+
+  it("handles zero quantity", () => {
+    const result = calculateInstalledPowerKw({
+      quantity: 0,
+      installedPowerPerUnitKw: 3,
+      demandFactor: 0.9,
+    });
+    assert.equal(result, 0);
+  });
+
+  it("handles zero demand factor", () => {
+    const result = calculateDemandPowerKw({
+      quantity: 5,
+      installedPowerPerUnitKw: 2,
+      demandFactor: 0,
+    });
+    assert.equal(result, 0);
+  });
+
+  it("calculates single-phase current", () => {
+    const current = calculateCurrentA({
+      demandPowerKw: 2.3,
+      voltageV: 230,
+      phaseCount: 1,
+      powerFactor: 0.95,
+    });
+    assert.ok(Math.abs(current - 10.53) < 0.02);
+  });
+
+  it("calculates three-phase current", () => {
+    const current = calculateCurrentA({
+      demandPowerKw: 9.5,
+      voltageV: 400,
+      phaseCount: 3,
+      powerFactor: 0.9,
+    });
+    assert.ok(Math.abs(current - 15.23) < 0.02);
+  });
+});