Improve coverage for image upload and schedule helper logic with focused unit tests (#551)

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frontend/src/test/features/schedule/interactions.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, it } from "vitest";
+import {
+	areAllDoseIdsTaken,
+	countTakenDoseIds,
+	resolveCollapsedState,
+	toggleDateInSet,
+} from "../../../features/schedule/interactions";
+
+describe("schedule interactions", () => {
+	it("toggles dates without mutating the original set", () => {
+		const previous = new Set(["2026-01-01"]);
+		const added = toggleDateInSet(previous, "2026-01-02");
+		const removed = toggleDateInSet(added, "2026-01-01");
+
+		expect(previous).toEqual(new Set(["2026-01-01"]));
+		expect(added).toEqual(new Set(["2026-01-01", "2026-01-02"]));
+		expect(removed).toEqual(new Set(["2026-01-02"]));
+	});
+
+	it("resolves auto and manual collapsed states", () => {
+		expect(resolveCollapsedState(true, "2026-01-01", new Set(), new Set())).toBe(true);
+		expect(resolveCollapsedState(true, "2026-01-01", new Set(["2026-01-01"]), new Set())).toBe(false);
+		expect(resolveCollapsedState(false, "2026-01-01", new Set(), new Set(["2026-01-01"]))).toBe(true);
+	});
+
+	it("counts and checks taken dose ids", () => {
+		const taken = new Set(["a", "c"]);
+		const isDoseTaken = (doseId: string) => taken.has(doseId);
+
+		expect(countTakenDoseIds(["a", "b", "c"], isDoseTaken)).toBe(2);
+		expect(areAllDoseIdsTaken(["a", "c"], isDoseTaken)).toBe(true);
+		expect(areAllDoseIdsTaken(["a", "b"], isDoseTaken)).toBe(false);
+		expect(areAllDoseIdsTaken([], isDoseTaken)).toBe(false);
+	});
+});