diff --git a/src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/AccessModifierOptionTest.java b/src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/AccessModifierOptionTest.java
index 0aefea7089c9..3a0df072ddc4 100644
--- a/src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/AccessModifierOptionTest.java
+++ b/src/test/java/com/puppycrawl/tools/checkstyle/checks/naming/AccessModifierOptionTest.java
@@ -57,4 +57,20 @@ public void testCase() {
                 .isEqualTo("private");
     }
 
+    @Test
+    public void testGetInstance() throws Exception{
+        assertWithMessage("Case mismatch.")
+                .that(AccessModifierOption.getInstance(" "+"public"))
+                .isEqualTo(AccessModifierOption.PUBLIC);
+        assertWithMessage("Case mismatch.")
+                .that(AccessModifierOption.getInstance(" "+"protected"))
+                .isEqualTo(AccessModifierOption.PROTECTED);
+        assertWithMessage("Case mismatch.")
+                .that(AccessModifierOption.getInstance(" "+"package"))
+                .isEqualTo(AccessModifierOption.PACKAGE);
+        assertWithMessage("Case mismatch.")
+                .that(AccessModifierOption.getInstance(" "+"private"))
+                .isEqualTo(AccessModifierOption.PRIVATE);
+    }
+
 }