test: add weather logic test suite

tests/forecast-utils.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from "vitest";
+
+import { getEffectiveHourlyWeatherCode, getForecastConditionKey, isForecastNight } from "@/lib/forecast-utils";
+
+describe("forecast utilities", () => {
+  it("promotes dry weather code to rain when precipitation probability is high", () => {
+    expect(
+      getEffectiveHourlyWeatherCode({
+        weatherCode: 0,
+        precipitation: 0,
+        precipitationProbability: 100,
+      }),
+    ).toBe(61);
+  });
+
+  it("keeps clear weather code when there is no precipitation signal", () => {
+    expect(
+      getEffectiveHourlyWeatherCode({
+        weatherCode: 0,
+        precipitation: 0,
+        precipitationProbability: 10,
+      }),
+    ).toBe(0);
+  });
+
+  it("recognizes night hours from sunrise and sunset", () => {
+    const day = {
+      sunrise: "2026-06-15T05:00",
+      sunset: "2026-06-15T21:00",
+    };
+
+    expect(isForecastNight("2026-06-15T03:00", day)).toBe(true);
+    expect(isForecastNight("2026-06-15T12:00", day)).toBe(false);
+    expect(isForecastNight("2026-06-15T22:00", day)).toBe(true);
+  });
+
+  it("maps storm and rain weather codes to condition keys", () => {
+    expect(getForecastConditionKey(61)).toBe("forecast.condition.rain");
+    expect(getForecastConditionKey(95)).toBe("forecast.condition.thunderstorm");
+  });
+});

tests/warning-regions.test.ts

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+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);
+  });
+});

tests/weather-brief.test.ts

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+import { describe, expect, it } from "vitest";
+
+import { buildTomorrowWeatherBrief, buildWeatherBrief } from "@/lib/weather-brief";
+import type { WeatherForecast, HourlyForecast } from "@/types/forecast";
+import type { WeatherWarning } from "@/types/imgw";
+import { getWeatherCapabilities } from "@/types/weather-region";
+
+function hour(overrides: Partial<HourlyForecast> = {}): HourlyForecast {
+  return {
+    time: "2026-06-14T08:00",
+    temperature: 10,
+    feelsLike: 9,
+    precipitationProbability: 20,
+    precipitation: 0,
+    weatherCode: 3,
+    windSpeed: 4,
+    source: "open-meteo",
+    ...overrides,
+  };
+}
+
+function forecast(hours: HourlyForecast[]): WeatherForecast {
+  return {
+    latitude: 52.23,
+    longitude: 21.01,
+    region: "PL",
+    timezone: "Europe/Warsaw",
+    hourly: hours,
+    daily: [],
+    sources: ["open-meteo"],
+    capabilities: getWeatherCapabilities("PL"),
+    unavailableReasons: [],
+  };
+}
+
+function warning(overrides: Partial<WeatherWarning> = {}): WeatherWarning {
+  return {
+    id: "meteo-1",
+    kind: "meteo",
+    level: 2,
+    title: "Thunderstorms",
+    description: null,
+    comment: null,
+    validFrom: "2026-06-15T06:00:00.000Z",
+    validTo: "2026-06-15T18:00:00.000Z",
+    publishedAt: null,
+    probability: 80,
+    areas: [],
+    terytCodes: ["146501"],
+    provinces: ["mazowieckie"],
+    office: null,
+    ...overrides,
+  };
+}
+
+describe("weather briefs", () => {
+  it("uses selected temperature and wind units in the morning brief", () => {
+    const brief = buildWeatherBrief({
+      forecast: forecast([
+        hour({ time: "2026-06-14T08:00", temperature: 10, windSpeed: 4, precipitationProbability: 80 }),
+        hour({ time: "2026-06-14T09:00", temperature: 12, windSpeed: 5, precipitationProbability: 30 }),
+      ]),
+      warnings: [],
+      province: "mazowieckie",
+      countyTeryt: "1465",
+      locationName: "Warsaw",
+      language: "en",
+      temperatureUnit: "f",
+      windSpeedUnit: "mph",
+      now: new Date("2026-06-14T06:00:00.000Z"),
+    });
+
+    expect(brief).not.toBeNull();
+    expect(brief?.pushBody).toContain("50°F-54°F");
+    expect(brief?.pushBody).toContain("wind 11 mph");
+    expect(brief?.pushBody).not.toContain("km/h");
+  });
+
+  it("warns about tomorrow storms from model weather codes without IMGW warning", () => {
+    const brief = buildTomorrowWeatherBrief({
+      forecast: forecast([
+        hour({ time: "2026-06-15T08:00", temperature: 14, weatherCode: 3, precipitationProbability: 20 }),
+        hour({ time: "2026-06-15T15:00", temperature: 21, weatherCode: 95, precipitationProbability: 30 }),
+      ]),
+      warnings: [],
+      province: "mazowieckie",
+      countyTeryt: "1465",
+      locationName: "Warsaw",
+      language: "en",
+      now: new Date("2026-06-14T16:00:00.000Z"),
+    });
+
+    expect(brief?.severity).toBe("warning");
+    expect(brief?.headline).toBe("Thunderstorms are possible tomorrow");
+    expect(brief?.pushBody).toContain("thunderstorms");
+    expect(brief?.pushBody).not.toContain("IMGW");
+  });
+
+  it("prefers relevant IMGW county warning over province-wide context", () => {
+    const brief = buildTomorrowWeatherBrief({
+      forecast: forecast([hour({ time: "2026-06-15T12:00", weatherCode: 3 })]),
+      warnings: [
+        warning({ title: "Radom storm", terytCodes: ["142501"] }),
+        warning({ title: "Warsaw storm", terytCodes: ["146501"] }),
+      ],
+      province: "mazowieckie",
+      countyTeryt: "1465",
+      locationName: "Warsaw",
+      language: "en",
+      now: new Date("2026-06-14T16:00:00.000Z"),
+    });
+
+    expect(brief?.headline).toBe("Tomorrow: IMGW Warsaw storm");
+    expect(brief?.pushBody).toContain("IMGW: Warsaw storm");
+    expect(brief?.pushBody).not.toContain("Radom storm");
+  });
+});

tests/weather-utils.test.ts

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+import { describe, expect, it } from "vitest";
+
+import {
+  DEFAULT_WIND_SPEED_UNIT,
+  formatTemperature,
+  formatWindSpeed,
+  isTemperatureUnit,
+  isWindSpeedUnit,
+} from "@/lib/weather-utils";
+
+describe("weather utilities", () => {
+  it("formats wind speed in km/h by default", () => {
+    expect(DEFAULT_WIND_SPEED_UNIT).toBe("kmh");
+    expect(formatWindSpeed(5, "en")).toBe("18 km/h");
+  });
+
+  it("formats selected temperature and wind units", () => {
+    expect(formatTemperature(10, "en", "f")).toBe("50°F");
+    expect(formatWindSpeed(4, "en", "mph")).toBe("9 mph");
+    expect(formatWindSpeed(4, "en", "ms")).toBe("4.0 m/s");
+  });
+
+  it("validates supported presentation units", () => {
+    expect(isTemperatureUnit("c")).toBe(true);
+    expect(isTemperatureUnit("kelvin")).toBe(false);
+    expect(isWindSpeedUnit("kmh")).toBe(true);
+    expect(isWindSpeedUnit("knots")).toBe(false);
+  });
+});