diff --git a/plugin-api/src/test/java/org/sonar/api/resources/AbstractLanguageTest.java b/plugin-api/src/test/java/org/sonar/api/resources/AbstractLanguageTest.java
index 67a09587..57775bb3 100644
--- a/plugin-api/src/test/java/org/sonar/api/resources/AbstractLanguageTest.java
+++ b/plugin-api/src/test/java/org/sonar/api/resources/AbstractLanguageTest.java
@@ -71,6 +71,13 @@ public void should_not_define_language_with_too_long_key() {
       .hasMessage("The following language key exceeds 20 characters: 'aKeyWhichIsVeryVeryVeryVeryVeryLong'");
   }
 
+  @Test
+  public void should_return_empty_filename_pattern_by_default() {
+    var lang = new Language1();
+
+    assertThat(lang.filenamePatterns()).isEmpty();
+  }
+
   static class TooLongKeyLanguage extends AbstractLanguage {
     public TooLongKeyLanguage() {
       super("aKeyWhichIsVeryVeryVeryVeryVeryLong");