[Behat][API] Allow setting no accept-language in header

[Locale] Prepend default channel locale when resolving by header

features/checkout/picking_up_the_cart_with_the_locale_other_than_the_default.feature

@@ -18,7 +18,7 @@ Feature: Picking up the cart with the locale other than the default
 
     @api
     Scenario: Picking up the cart without specified locale
-        When I pick up cart
+        When I pick up cart without specifying locale
         And I check details of my cart
         Then my cart's locale should be "French (France)"
 

src/Sylius/Behat/Context/Api/Shop/CartContext.php

@@ -218,6 +218,7 @@ final class CartContext implements Context
     /**
      * @When I pick up (my )cart (again)
      * @When I pick up cart in the :localeCode locale
+     * @When I pick up cart without specifying locale
      * @When the visitor picks up the cart
      */
     public function iPickUpMyCart(?string $localeCode = null): void
@@ -776,8 +777,9 @@ final class CartContext implements Context
         $request = $this->requestFactory->custom(
             sprintf('%s/shop/orders', $this->apiUrlPrefix),
             HttpRequest::METHOD_POST,
-            $localeCode ? ['HTTP_ACCEPT_LANGUAGE' => $localeCode] : [],
+            ['HTTP_ACCEPT_LANGUAGE' => $localeCode ?? ''],
         );
+
         $this->shopClient->executeCustomRequest($request);
 
         $tokenValue = $this->responseChecker->getValue($this->shopClient->getLastResponse(), 'tokenValue');

src/Sylius/Bundle/LocaleBundle/Context/RequestHeaderBasedLocaleContext.php

@@ -27,6 +27,9 @@ final class RequestHeaderBasedLocaleContext implements LocaleContextInterface
 {
     private const NO_CODE_VALID_STUB = 'NO_CODE_VALID_STUB';
 
+    /** @var array<array-key, string> $availableLocalesCodes */
+    private array $availableLocalesCodes = [];
+
     public function __construct(private RequestStack $requestStack, private LocaleProviderInterface $localeProvider)
     {
     }
@@ -38,17 +41,22 @@ final class RequestHeaderBasedLocaleContext implements LocaleContextInterface
             throw new LocaleNotFoundException('No main request available.');
         }
 
-        $availableLocalesCodes = $this->localeProvider->getAvailableLocalesCodes();
+        if ([] === $this->availableLocalesCodes) {
+            $this->availableLocalesCodes = array_unique(array_merge(
+                [$this->localeProvider->getDefaultLocaleCode()],
+                $this->localeProvider->getAvailableLocalesCodes()
+            ));
+        }
 
         // Request::getPreferredLanguage() returns first available locale code if none matches. To allow detection of
         // this unwanted behavior, we will prepend special locale code to the list of available locale codes.
-        $prependedAvailableLocalesCodes = array_merge([self::NO_CODE_VALID_STUB], $availableLocalesCodes);
+        $prependedAvailableLocalesCodes = array_merge([self::NO_CODE_VALID_STUB], $this->availableLocalesCodes);
 
         $bestLocaleCode = $request->getPreferredLanguage($prependedAvailableLocalesCodes);
         if (self::NO_CODE_VALID_STUB === $bestLocaleCode) {
             throw new LocaleNotFoundException(sprintf(
                 'None of the available locales is acceptable: "%s".',
-                implode('", "', $availableLocalesCodes),
+                implode('", "', $this->availableLocalesCodes),
             ));
         }
 

src/Sylius/Bundle/LocaleBundle/spec/Context/RequestHeaderBasedLocaleContextSpec.php

@@ -48,6 +48,7 @@ final class RequestHeaderBasedLocaleContextSpec extends ObjectBehavior
 
         $requestStack->getMainRequest()->willReturn($request);
 
+        $localeProvider->getDefaultLocaleCode()->willReturn('pl_PL');
         $localeProvider->getAvailableLocalesCodes()->willReturn(['pl_PL', 'de_DE']);
 
         $this->shouldThrow(LocaleNotFoundException::class)->during('getLocaleCode');
@@ -62,6 +63,7 @@ final class RequestHeaderBasedLocaleContextSpec extends ObjectBehavior
 
         $requestStack->getMainRequest()->willReturn($request);
 
+        $localeProvider->getDefaultLocaleCode()->willReturn('pl_PL');
         $localeProvider->getAvailableLocalesCodes()->willReturn(['pl_PL', 'de_DE']);
 
         $this->getLocaleCode()->shouldReturn('de_DE');
@@ -76,6 +78,7 @@ final class RequestHeaderBasedLocaleContextSpec extends ObjectBehavior
 
         $requestStack->getMainRequest()->willReturn($request);
 
+        $localeProvider->getDefaultLocaleCode()->willReturn('pl_PL');
         $localeProvider->getAvailableLocalesCodes()->willReturn(['pl_PL', 'de_DE']);
 
         $this->getLocaleCode()->shouldReturn('de_DE');
@@ -90,6 +93,7 @@ final class RequestHeaderBasedLocaleContextSpec extends ObjectBehavior
 
         $requestStack->getMainRequest()->willReturn($request);
 
+        $localeProvider->getDefaultLocaleCode()->willReturn('pl_PL');
         $localeProvider->getAvailableLocalesCodes()->willReturn(['pl_PL', 'de_DE']);
 
         $this->getLocaleCode()->shouldReturn('de_DE');
@@ -104,6 +108,7 @@ final class RequestHeaderBasedLocaleContextSpec extends ObjectBehavior
 
         $requestStack->getMainRequest()->willReturn($request);
 
+        $localeProvider->getDefaultLocaleCode()->willReturn('pl_PL');
         $localeProvider->getAvailableLocalesCodes()->willReturn(['pl_PL', 'de_DE']);
 
         $this->getLocaleCode()->shouldReturn('de_DE');