test: add weather logic test suite

tests/weather-brief.test.ts

@@ -0,0 +1,117 @@
+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");
+  });
+});