[c59817] Fix for extracting relative dates in Russian and add unit tests for date extraction (#193)

* Fix regex for extracting relative dates in Russian and add unit tests for date extraction

* Fix date extraction for Ukrainian and Belarusian languages and update tests

Author: wizard86pz

packages/TGUIKit/Sources/Extensions.swift

@@ -3388,7 +3388,7 @@ private func extractRelativeDates(from text: String, referenceDate: Date) -> [Ex
         { s in
             let u = s
             if u.hasPrefix("hour") || u == "h" || u.hasPrefix("hr")
-                || u.hasPrefix("час") || u.hasPrefix("год") || u.hasPrefix("гад") // ru/uk/be
+                || u.hasPrefix("час") || u.hasPrefix("годин") || u.hasPrefix("гадз") // ru/uk/be
                 || u.hasPrefix("st") || u.hasPrefix("std") // de Stunde
                 || u.hasPrefix("heure") || u.hasPrefix("heures") // fr
                 || u.hasPrefix("hora") || u.hasPrefix("horas") // es

packages/TGUIKit/Tests/TGUIKitTests/DateExtractionTests.swift

@@ -0,0 +1,38 @@
+import Foundation
+import XCTest
+import TGUIKit
+
+final class DateExtractionTests: XCTestCase {
+    private let referenceDate = Date(timeIntervalSince1970: 0)
+
+    func testRussianYearIsNotDetectedAsHour() {
+        XCTAssertTrue(extractDates(from: "через 1 год", referenceDate: referenceDate).isEmpty)
+        XCTAssertEqual(
+            extractDates(from: "через 1 год = через 60 минут", referenceDate: referenceDate).map(\.text),
+            ["через 60 минут"]
+        )
+    }
+
+    func testRussianUkrainianAndBelarusianHoursAreDetected() {
+        XCTAssertEqual(
+            extractDates(from: "через 1 час", referenceDate: referenceDate).map(\.text),
+            ["через 1 час"]
+        )
+        XCTAssertEqual(
+            extractDates(from: "через 2 години", referenceDate: referenceDate).map(\.text),
+            ["через 2 години"]
+        )
+        XCTAssertEqual(
+            extractDates(from: "за годину", referenceDate: referenceDate).map(\.text),
+            ["за годину"]
+        )
+        XCTAssertEqual(
+            extractDates(from: "через 5 годин", referenceDate: referenceDate).map(\.text),
+            ["через 5 годин"]
+        )
+        XCTAssertEqual(
+            extractDates(from: "праз 1 гадзіну", referenceDate: referenceDate).map(\.text),
+            ["праз 1 гадзіну"]
+        )
+    }
+}