Derive device voltages from project settings

tests/circuit-power-calculation.test.ts

@@ -4,6 +4,10 @@ import {
   calculateCircuitTotalPower,
   calculateRowTotalPower,
 } from "../src/domain/calculations/circuit-power-calculation.js";
+import {
+  resolveCircuitPhaseType,
+  resolveProjectVoltage,
+} from "../src/domain/services/project-voltage.service.js";
 
 describe("circuit power calculation", () => {
   it("calculates row and circuit totals from device rows", () => {
@@ -16,3 +20,28 @@ describe("circuit power calculation", () => {
   });
 });
 
+describe("project voltage derivation", () => {
+  const settings = {
+    singlePhaseVoltageV: 240,
+    threePhaseVoltageV: 415,
+  };
+
+  it("derives device voltage exclusively from phase and project settings", () => {
+    assert.equal(resolveProjectVoltage("single_phase", settings), 240);
+    assert.equal(resolveProjectVoltage("three_phase", settings), 415);
+  });
+
+  it("uses section phase and handles unassigned circuits conservatively", () => {
+    assert.equal(resolveCircuitPhaseType("lighting", ["three_phase"]), "single_phase");
+    assert.equal(resolveCircuitPhaseType("single_phase", ["three_phase"]), "single_phase");
+    assert.equal(resolveCircuitPhaseType("three_phase", ["single_phase"]), "three_phase");
+    assert.equal(resolveCircuitPhaseType("unassigned", ["three_phase"]), "three_phase");
+    assert.equal(
+      resolveCircuitPhaseType("unassigned", ["three_phase", "single_phase"]),
+      "single_phase"
+    );
+    assert.equal(resolveCircuitPhaseType("unassigned", []), "single_phase");
+    assert.equal(resolveCircuitPhaseType("unassigned", [null]), "single_phase");
+  });
+});
+