diff --git a/src/main/java/ua/net/uid/utils/helpers/CharsetHelper.java b/src/main/java/ua/net/uid/utils/helpers/CharsetHelper.java
index 2774820..5a7b62d 100644
--- a/src/main/java/ua/net/uid/utils/helpers/CharsetHelper.java
+++ b/src/main/java/ua/net/uid/utils/helpers/CharsetHelper.java
@@ -30,10 +30,6 @@
         return false;
     }
 
-    public static Charset toCharset(Charset charset) {
-        return charset == null ? Charset.defaultCharset() : charset;
-    }
-
     public static Charset toCharset(String charsetName) {
         return charsetName == null ? Charset.defaultCharset() : Charset.forName(charsetName);
     }
diff --git a/src/test/java/ua/net/uid/utils/helpers/CharsetHelperTest.java b/src/test/java/ua/net/uid/utils/helpers/CharsetHelperTest.java
new file mode 100644
index 0000000..5e98a44
--- /dev/null
+++ b/src/test/java/ua/net/uid/utils/helpers/CharsetHelperTest.java
@@ -0,0 +1,34 @@
+package ua.net.uid.utils.helpers;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.nio.charset.UnsupportedCharsetException;
+
+class CharsetHelperTest {
+    @Test
+    void testIsSupported() {
+        assertFalse(CharsetHelper.isSupported(null));
+        assertFalse(CharsetHelper.isSupported(""));
+        assertFalse(CharsetHelper.isSupported("Unknown"));
+        assertTrue(CharsetHelper.isSupported("UTF-8"));
+        assertTrue(CharsetHelper.isSupported("UTF-16"));
+    }
+
+    @Test
+    void testToCharset() {
+        assertEquals(Charset.defaultCharset(), CharsetHelper.toCharset(null));
+        assertEquals(StandardCharsets.UTF_8, CharsetHelper.toCharset("UTF-8"));
+        assertThrows(UnsupportedCharsetException.class, () -> CharsetHelper.toCharset("Unknown"));
+    }
+
+    @Test
+    void testToCharsetName() {
+        assertEquals(Charset.defaultCharset().name(), CharsetHelper.toCharsetName(null));
+        assertEquals(StandardCharsets.UTF_8.name(), CharsetHelper.toCharsetName("UTF-8"));
+        assertThrows(UnsupportedCharsetException.class, () -> CharsetHelper.toCharsetName("Unknown"));
+    }
+}