✅ **Add tests for LangCountry data resolution and Latvian overrides**

- ➕ Introduced `LangCountryDataAvailabilityTest` to validate data file availability and integrity for allowed `lang-country` codes.
- 🛠️ Added Latvian (`lv-LV`) override JSON file with localized settings and validation.
- 🧪 Verified graceful switching between `lang-country` sessions in tests.

lang/lang-country-overrides/lv-LV.json

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+{
+  "country": "LV",
+  "country_name": "Latvia",
+  "country_name_local": "Latvija",
+  "lang": "lv",
+  "name": "Latviešu",
+  "date_numbers": "d.m.Y",
+  "date_numbers_full_capitals": "DD.MM.YYYY",
+  "date_words_without_day": "Y. \\g\\a\\d\\a j. F",
+  "date_words_with_day": "l, Y. \\g\\a\\d\\a j. F",
+  "date_birthday": "j. F",
+  "time_format": "H:i",
+  "emoji_flag": "🇱🇻",
+  "currency_code": "EUR",
+  "currency_symbol": "€",
+  "currency_symbol_local": "€",
+  "currency_name": "Euro",
+  "currency_name_local": "eiro"
+}

tests/Feature/LangCountryDataAvailabilityTest.php

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+<?php
+
+use Stefro\LaravelLangCountry\LangCountry;
+
+/**
+ * Resolves a lang-country data file the same way the package does:
+ * a published override in lang/lang-country-overrides/ takes precedence,
+ * otherwise the file shipped with the package is used.
+ */
+function resolveLangCountryFile(string $langCountry): ?string
+{
+    $override = lang_path('lang-country-overrides/'.$langCountry.'.json');
+    if (file_exists($override)) {
+        return $override;
+    }
+
+    $packaged = base_path('vendor/stefro/laravel-lang-country/src/LangCountryData/'.$langCountry.'.json');
+
+    return file_exists($packaged) ? $packaged : null;
+}
+
+dataset('allowed_lang_countries', function () {
+    $config = require __DIR__.'/../../config/lang-country.php';
+
+    return collect($config['allowed'])
+        ->mapWithKeys(fn (string $langCountry) => [$langCountry => [$langCountry]])
+        ->all();
+});
+
+it('has a resolvable data file for every allowed lang-country', function (string $langCountry) {
+    $file = resolveLangCountryFile($langCountry);
+
+    expect($file)->not->toBeNull(
+        "No data file found for allowed lang-country [{$langCountry}]. "
+        ."Add lang/lang-country-overrides/{$langCountry}.json."
+    );
+
+    $data = json_decode(file_get_contents($file), true);
+
+    expect($data)->toBeArray()->toHaveKeys([
+        'country',
+        'country_name',
+        'country_name_local',
+        'lang',
+        'name',
+        'date_numbers',
+        'date_numbers_full_capitals',
+        'date_words_without_day',
+        'date_words_with_day',
+        'date_birthday',
+        'time_format',
+        'emoji_flag',
+        'currency_code',
+        'currency_symbol',
+        'currency_symbol_local',
+        'currency_name',
+        'currency_name_local',
+    ]);
+})->with('allowed_lang_countries');
+
+it('can construct LangCountry for every allowed lang-country without error', function (string $langCountry) {
+    session(['lang_country' => $langCountry]);
+
+    $langCountryInstance = new LangCountry;
+
+    expect($langCountryInstance->currentLangCountry())->toBe($langCountry);
+})->with('allowed_lang_countries');
+
+it('switches away from a freshly added lang-country without throwing', function () {
+    session(['lang_country' => 'lv-LV']);
+
+    $response = $this->get(config('lang-country.lang_switcher_uri').'/de-DE');
+
+    $response->assertRedirect();
+    expect(session('lang_country'))->toBe('de-DE');
+});