test: add weather logic test suite

tests/warning-regions.test.ts

@@ -0,0 +1,67 @@
+import { describe, expect, it } from "vitest";
+
+import { getCountyTerytForLocation, warningMatchesCounty, warningMatchesLocalSelection } from "@/lib/warning-regions";
+import type { WeatherWarning } from "@/types/imgw";
+import type { SelectedLocation } from "@/types/location";
+
+function warning(overrides: Partial<WeatherWarning> = {}): WeatherWarning {
+  return {
+    id: "meteo-1",
+    kind: "meteo",
+    level: 1,
+    title: "Storm",
+    description: null,
+    comment: null,
+    validFrom: null,
+    validTo: null,
+    publishedAt: null,
+    probability: null,
+    areas: [],
+    terytCodes: [],
+    provinces: ["mazowieckie"],
+    office: null,
+    ...overrides,
+  };
+}
+
+function location(overrides: Partial<SelectedLocation> = {}): SelectedLocation {
+  return {
+    name: "Warszawa",
+    province: "mazowieckie",
+    district: "Warszawa",
+    country: "Poland",
+    countryCode: "PL",
+    admin1: "Mazowieckie",
+    admin2: "Warszawa",
+    timezone: "Europe/Warsaw",
+    region: "PL",
+    countyTeryt: "1465",
+    latitude: 52.23,
+    longitude: 21.01,
+    stationId: null,
+    stationName: null,
+    distanceKm: null,
+    ...overrides,
+  };
+}
+
+describe("warning region matching", () => {
+  it("resolves Mazowieckie county codes from district names", () => {
+    expect(getCountyTerytForLocation("mazowieckie", "Warszawa", null)).toBe("1465");
+    expect(getCountyTerytForLocation("mazowieckie", "radomski", null)).toBe("1425");
+  });
+
+  it("matches meteorological warnings by county TERYT prefix", () => {
+    const warsawWarning = warning({ terytCodes: ["146501"] });
+
+    expect(warningMatchesCounty(warsawWarning, "1465")).toBe(true);
+    expect(warningMatchesCounty(warsawWarning, "1425")).toBe(false);
+  });
+
+  it("uses county filtering before province fallback for selected locations", () => {
+    const radomWarning = warning({ terytCodes: ["142501"] });
+
+    expect(warningMatchesLocalSelection(radomWarning, "mazowieckie", location())).toBe(false);
+    expect(warningMatchesLocalSelection(radomWarning, "mazowieckie", location({ countyTeryt: null }))).toBe(true);
+  });
+});