Extend with a language code in http accept languages

android_webview/javatests/src/org/chromium/android_webview/test/AcceptLanguageTest.java

Index: android_webview/javatests/src/org/chromium/android_webview/test/AcceptLanguageTest.java
diff --git a/android_webview/javatests/src/org/chromium/android_webview/test/AcceptLanguageTest.java b/android_webview/javatests/src/org/chromium/android_webview/test/AcceptLanguageTest.java
index 75160e04f25a96a825d0cb0c4ac787af375421f8..58ed86fbea5c22c9b834b6abf83f24149d4ddef9 100644
--- a/android_webview/javatests/src/org/chromium/android_webview/test/AcceptLanguageTest.java
+++ b/android_webview/javatests/src/org/chromium/android_webview/test/AcceptLanguageTest.java
@@ -17,7 +17,6 @@ import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.MinAndroidSdkLevel;
 import org.chromium.net.test.EmbeddedTestServer;
 
-import java.util.Arrays;
 import java.util.Locale;
 import java.util.regex.Pattern;
 
@@ -54,12 +53,12 @@ public class AcceptLanguageTest extends AwTestBase {
      * The Accept-Language header can have more than one language along with optional quality
      * factors for each, e.g.
      *
-     *  "de-DE,en-US;q=0.8,en-UK;q=0.5"
+     *  "de-DE,de;q=0.8,en-US;q=0.6,en-GB;q=0.4,en;q=0.2"
      *
      * This function extracts only the language strings from the Accept-Language header, so
      * the example above would yield the following:
      *
-     *  ["de-DE", "en-US", "en-UK"]
+     *  ["de-DE", "de", "en-US", "en-GB", "en"]
      *
      * @param raw String containing the raw Accept-Language header
      * @return A list of languages as Strings.
@@ -91,12 +90,9 @@ public class AcceptLanguageTest extends AwTestBase {
                 JSUtils.executeJavaScriptAndWaitForResult(
                         this, mAwContents, mContentsClient.getOnEvaluateJavaScriptResultHelper(),
                         "navigator.languages.join(',')"));
-        assertEquals(acceptLanguagesJs.length, acceptLanguages.length);
-        for (int i = 0; i < acceptLanguagesJs.length; ++i) {
-            assertEquals(acceptLanguagesJs[i], acceptLanguages[i]);
-        }
+        assertEquals(LocaleUtils.getDefaultLocaleString(), acceptLanguagesJs[0]);
 
-        // Test locale change at run time
+        // Test locale change at run time.
         Locale.setDefault(new Locale("de", "DE"));
         mAwContents.updateDefaultLocale();
         mAwContents.getSettings().updateAcceptLanguages();
@@ -107,7 +103,7 @@ public class AcceptLanguageTest extends AwTestBase {
                 JSUtils.executeJavaScriptAndWaitForResult(
                         this, mAwContents, mContentsClient.getOnEvaluateJavaScriptResultHelper(),
                         "document.body.textContent"));
-        assertEquals(LocaleUtils.getDefaultLocaleString(), acceptLanguages[0]);
+        assertEquals("de-DE,de", acceptLanguages[0] + "," + acceptLanguages[1]);
     }
 
     /**
@@ -119,43 +115,45 @@ public class AcceptLanguageTest extends AwTestBase {
     @MinAndroidSdkLevel(Build.VERSION_CODES.N)
     @SuppressLint("NewApi")
     @Feature({"AndroidWebView"})
-    public void testAcceptLanguagesWithenUS() throws Throwable {
+    public void testAcceptLanguages() throws Throwable {
         getAwSettingsOnUiThread(mAwContents).setJavaScriptEnabled(true);
-
-        // This should yield a lightly formatted page with the contents of the Accept-Language
-        // header, e.g. "en-US" or "de-DE,en-US;q=0.8", as the only text content.
         String url = mTestServer.getURL("/echoheader?Accept-Language");
         loadUrlSync(mAwContents, mContentsClient.getOnPageFinishedHelper(), url);
 
-        String[] acceptLanguages = getAcceptLanguages(JSUtils.executeJavaScriptAndWaitForResult(
-                this, mAwContents, mContentsClient.getOnEvaluateJavaScriptResultHelper(),
-                "document.body.textContent"));
-        assertEquals(
-                LocaleUtils.getDefaultLocaleListString(), TextUtils.join(",", acceptLanguages));
-
         String[] acceptLanguagesJs = getAcceptLanguages(JSUtils.executeJavaScriptAndWaitForResult(
                 this, mAwContents, mContentsClient.getOnEvaluateJavaScriptResultHelper(),
                 "navigator.languages.join(',')"));
-        assertEquals(acceptLanguagesJs.length, acceptLanguages.length);
-        for (int i = 0; i < acceptLanguagesJs.length; ++i) {
-            assertEquals(acceptLanguagesJs[i], acceptLanguages[i]);
-        }
+        assertEquals(
+                LocaleUtils.getDefaultLocaleListString(), TextUtils.join(",", acceptLanguagesJs));
 
-        // Test locales that contain "en-US" change at run time
+        // Test locales that contain "en-US" change at run time.
         LocaleList.setDefault(new LocaleList(new Locale("de", "DE"), new Locale("en", "US")));
         mAwContents.updateDefaultLocale();
         mAwContents.getSettings().updateAcceptLanguages();
 
         loadUrlSync(mAwContents, mContentsClient.getOnPageFinishedHelper(), url);
 
+        String[] acceptLanguages = getAcceptLanguages(JSUtils.executeJavaScriptAndWaitForResult(
+                this, mAwContents, mContentsClient.getOnEvaluateJavaScriptResultHelper(),
+                "document.body.textContent"));
+        assertEquals("de-DE,de,en-US,en", TextUtils.join(",", acceptLanguages));
+
+        // Test locales that do not contain "en-US" change at run time, "en-US" should be added with
+        // lower priority.
+        LocaleList.setDefault(new LocaleList(new Locale("de", "DE"), new Locale("ja", "JP")));
+        mAwContents.updateDefaultLocale();
+        mAwContents.getSettings().updateAcceptLanguages();
+
+        loadUrlSync(mAwContents, mContentsClient.getOnPageFinishedHelper(), url);
+
         acceptLanguages = getAcceptLanguages(JSUtils.executeJavaScriptAndWaitForResult(this,
                 mAwContents, mContentsClient.getOnEvaluateJavaScriptResultHelper(),
                 "document.body.textContent"));
-        assertEquals(
-                LocaleUtils.getDefaultLocaleListString(), TextUtils.join(",", acceptLanguages));
+        assertEquals("de-DE,de,ja-JP,ja,en-US,en", TextUtils.join(",", acceptLanguages));
 
-        // Test locales that contain "en-us" change at run time
-        LocaleList.setDefault(new LocaleList(new Locale("de", "DE"), new Locale("en", "us")));
+        // Test language code is inserted only after the last language tag that contains that
+        // language.
+        LocaleList.setDefault(new LocaleList(new Locale("en", "GB"), new Locale("en", "US")));
         mAwContents.updateDefaultLocale();
         mAwContents.getSettings().updateAcceptLanguages();
 
@@ -164,11 +162,9 @@ public class AcceptLanguageTest extends AwTestBase {
         acceptLanguages = getAcceptLanguages(JSUtils.executeJavaScriptAndWaitForResult(this,
                 mAwContents, mContentsClient.getOnEvaluateJavaScriptResultHelper(),
                 "document.body.textContent"));
-        assertEquals(
-                LocaleUtils.getDefaultLocaleListString(), TextUtils.join(",", acceptLanguages));
+        assertEquals("en-GB,en-US,en", TextUtils.join(",", acceptLanguages));
 
-        // Test locales that do not contain "en-us" or "en-US" change at run time
-        LocaleList.setDefault(new LocaleList(new Locale("de", "DE"), new Locale("ja", "JP")));
+        LocaleList.setDefault(new LocaleList(new Locale("en", "GB"), new Locale("ja", "JP")));
         mAwContents.updateDefaultLocale();
         mAwContents.getSettings().updateAcceptLanguages();
 
@@ -177,7 +173,6 @@ public class AcceptLanguageTest extends AwTestBase {
         acceptLanguages = getAcceptLanguages(JSUtils.executeJavaScriptAndWaitForResult(this,
                 mAwContents, mContentsClient.getOnEvaluateJavaScriptResultHelper(),
                 "document.body.textContent"));
-        String[] acceptLangs = Arrays.copyOfRange(acceptLanguages, 0, acceptLanguages.length - 1);
-        assertEquals(LocaleUtils.getDefaultLocaleListString(), TextUtils.join(",", acceptLangs));
+        assertEquals("en-GB,ja-JP,ja,en-US,en", TextUtils.join(",", acceptLanguages));
     }
 }