diff --git a/src/shared/dictionaries/transform.test.ts b/src/shared/dictionaries/transform.test.ts
index 968ddd35..2f746493 100644
--- a/src/shared/dictionaries/transform.test.ts
+++ b/src/shared/dictionaries/transform.test.ts
@@ -94,3 +94,120 @@ describe("transformDictionaries — filtering", () => {
     expect([...d.otherCityCodes]).toEqual(["PAR"]);
   });
 });
+
+describe("transformDictionaries — enrichment", () => {
+  it("picks localized city name from title[lang]", () => {
+    const d = transformDictionaries(
+      {
+        regions: [],
+        countries: [],
+        cities: [
+          { code: "MOW", title: { ru: "Москва", en: "Moscow" }, country_code: "RU", has_afl_flights: true, location: { lat: 55, lon: 37 } },
+        ],
+        airports: [
+          { code: "SVO", city_code: "MOW", title: { ru: "Шереметьево", en: "Sheremetyevo" }, has_afl_flights: true, location: { lat: 55, lon: 37 } },
+        ],
+      },
+      "en",
+    );
+
+    expect(d.cities[0]!.name).toBe("Moscow");
+    expect(d.cities[0]!.airports[0]!.name).toBe("Sheremetyevo");
+  });
+
+  it("looks up countryName from countries dictionary", () => {
+    const d = transformDictionaries(
+      {
+        regions: [],
+        countries: [{ code: "RU", title: { ru: "Россия", en: "Russia" }, world_region_id: 500374 }],
+        cities: [
+          { code: "MOW", title: { ru: "Москва" }, country_code: "RU", has_afl_flights: true, location: { lat: 55, lon: 37 } },
+        ],
+        airports: [
+          { code: "SVO", city_code: "MOW", title: { ru: "Шереметьево" }, has_afl_flights: true, location: { lat: 55, lon: 37 } },
+        ],
+      },
+      "en",
+    );
+
+    expect(d.cities[0]!.countryName).toBe("Russia");
+  });
+
+  it("sorts a city's airports by localized name", () => {
+    const d = transformDictionaries(
+      {
+        regions: [],
+        countries: [],
+        cities: [
+          { code: "MOW", title: { ru: "Москва" }, country_code: "RU", has_afl_flights: true, location: { lat: 55, lon: 37 } },
+        ],
+        airports: [
+          { code: "SVO", city_code: "MOW", title: { ru: "Шереметьево" }, has_afl_flights: true, location: { lat: 55, lon: 37 } },
+          { code: "DME", city_code: "MOW", title: { ru: "Домодедово" }, has_afl_flights: true, location: { lat: 55, lon: 37 } },
+          { code: "VKO", city_code: "MOW", title: { ru: "Внуково" }, has_afl_flights: true, location: { lat: 55, lon: 37 } },
+        ],
+      },
+      "ru",
+    );
+
+    expect(d.cities[0]!.airports.map((a) => a.code)).toEqual(["VKO", "DME", "SVO"]);
+  });
+});
+
+describe("transformDictionaries — lookup maps", () => {
+  it("keys lookup maps by uppercase", () => {
+    const d = transformDictionaries(
+      {
+        regions: [],
+        countries: [],
+        cities: [
+          { code: "mow", title: { ru: "Москва" }, country_code: "RU", has_afl_flights: true, location: { lat: 55, lon: 37 } },
+        ],
+        airports: [
+          { code: "svo", city_code: "mow", title: { ru: "Шереметьево" }, has_afl_flights: true, location: { lat: 55, lon: 37 } },
+        ],
+      },
+      "ru",
+    );
+
+    expect(d.cityByCode.get("MOW")?.code).toBe("mow");
+    expect(d.airportByCode.get("SVO")?.code).toBe("svo");
+  });
+});
+
+describe("transformDictionaries — regions", () => {
+  it("drops Australia region (world_region_id 500373)", () => {
+    const d = transformDictionaries(
+      {
+        regions: [
+          { world_region_id: 500373, title: { ru: "Австралия" } },
+          { world_region_id: 500374, title: { ru: "Россия" } },
+        ],
+        countries: [],
+        cities: [],
+        airports: [],
+      },
+      "ru",
+    );
+
+    expect(d.regions.map((r) => r.id)).toEqual([500374]);
+  });
+
+  it("places Russia region first, others alphabetical", () => {
+    const d = transformDictionaries(
+      {
+        regions: [
+          { world_region_id: 500374, title: { ru: "Россия" } },
+          { world_region_id: 1, title: { ru: "Азия" } },
+          { world_region_id: 2, title: { ru: "Европа" } },
+        ],
+        countries: [],
+        cities: [],
+        airports: [],
+      },
+      "ru",
+    );
+
+    expect(d.regions.map((r) => r.id)).toEqual([500374, 1, 2]);
+  });
+});