diff --git a/src/test/java/com/github/imdmk/automessage/DurationUtilTest.java b/src/test/java/com/github/imdmk/automessage/DurationUtilTest.java
deleted file mode 100644
index 1b3f87a..0000000
--- a/src/test/java/com/github/imdmk/automessage/DurationUtilTest.java
+++ /dev/null
@@ -1,30 +0,0 @@
-package com.github.imdmk.automessage;
-
-import com.github.imdmk.automessage.util.DurationUtil;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.MethodSource;
-
-import java.time.Duration;
-import java.util.List;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-public class DurationUtilTest {
-
-    static List<Object[]> durations() {
-        return List.of(new Object[][] {
-                { 0, Duration.ZERO },
-                { 1, Duration.ofMillis(50) },
-                { 20, Duration.ofSeconds(1) },
-                { 1200, Duration.ofMinutes(1) },
-                { 72000, Duration.ofHours(1) }
-        });
-    }
-
-    @ParameterizedTest
-    @MethodSource("durations")
-    void toTickTest(long expected, Duration duration) {
-        long result = DurationUtil.toTicks(duration);
-        assertEquals(expected, result);
-    }
-}
diff --git a/src/test/java/com/github/imdmk/automessage/NotificationFormatterTest.java b/src/test/java/com/github/imdmk/automessage/NotificationFormatterTest.java
new file mode 100644
index 0000000..4b9314a
--- /dev/null
+++ b/src/test/java/com/github/imdmk/automessage/NotificationFormatterTest.java
@@ -0,0 +1,24 @@
+package com.github.imdmk.automessage;
+
+import com.github.imdmk.automessage.notification.Notification;
+import com.github.imdmk.automessage.notification.NotificationFormatter;
+import com.github.imdmk.automessage.notification.implementation.ChatNotification;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class NotificationFormatterTest {
+
+    @Test
+    void testFormat() {
+        ChatNotification notificationToFormat = new ChatNotification("This plugin is called {PLUGIN} and its author is {AUTHOR}.");
+
+        Notification excepted = new ChatNotification("This plugin is called AutoMessage and its author is imDMK.");
+        Notification result = new NotificationFormatter(notificationToFormat)
+                .placeholder("{PLUGIN}", "AutoMessage")
+                .placeholder("{AUTHOR}", "imDMK")
+                .build();
+
+        assertEquals(excepted, result);
+    }
+}
diff --git a/src/test/java/com/github/imdmk/automessage/StringUtilTest.java b/src/test/java/com/github/imdmk/automessage/StringUtilTest.java
deleted file mode 100644
index f2359f4..0000000
--- a/src/test/java/com/github/imdmk/automessage/StringUtilTest.java
+++ /dev/null
@@ -1,26 +0,0 @@
-package com.github.imdmk.automessage;
-
-import com.github.imdmk.automessage.util.StringUtil;
-import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.MethodSource;
-
-import java.util.List;
-
-import static org.junit.jupiter.api.Assertions.assertEquals;
-
-public class StringUtilTest {
-
-    static List<Object[]> integers() {
-        return List.of(new Object[][] {
-                { false, "AutoMessage" },
-                { true, "50" }
-        });
-    }
-
-    @ParameterizedTest
-    @MethodSource("integers")
-    void integerTest(boolean excepted, String string) {
-        boolean result = StringUtil.isInteger(string);
-        assertEquals(excepted, result);
-    }
-}
diff --git a/src/test/java/com/github/imdmk/automessage/util/ComponentUtilTest.java b/src/test/java/com/github/imdmk/automessage/util/ComponentUtilTest.java
new file mode 100644
index 0000000..50618d9
--- /dev/null
+++ b/src/test/java/com/github/imdmk/automessage/util/ComponentUtilTest.java
@@ -0,0 +1,30 @@
+package com.github.imdmk.automessage.util;
+
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.format.NamedTextColor;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ComponentUtilTest {
+
+    @Test
+    void testDeserialize() {
+        String resultContent = "<red>DMK";
+
+        Component result = ComponentUtil.deserialize(resultContent);
+        Component excepted = Component.text("DMK").color(NamedTextColor.RED);
+
+        assertEquals(excepted, result);
+    }
+
+    @Test
+    void testLegacyDeserialize() {
+        String resultContent = "§4DMK";
+
+        Component result = ComponentUtil.deserialize(resultContent);
+        Component excepted = Component.text("DMK").color(NamedTextColor.DARK_RED);
+
+        assertEquals(excepted, result);
+    }
+}
diff --git a/src/test/java/com/github/imdmk/automessage/util/DurationUtilTest.java b/src/test/java/com/github/imdmk/automessage/util/DurationUtilTest.java
new file mode 100644
index 0000000..4c474eb
--- /dev/null
+++ b/src/test/java/com/github/imdmk/automessage/util/DurationUtilTest.java
@@ -0,0 +1,43 @@
+package com.github.imdmk.automessage.util;
+
+import org.junit.jupiter.api.Test;
+
+import java.time.Duration;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class DurationUtilTest {
+
+    @Test
+    void testHumanReadable() {
+        Duration ofSeconds = Duration.ofSeconds(5);
+        String secondsExcepted = "5s";
+        String secondsResult = DurationUtil.toHumanReadable(ofSeconds);
+
+        Duration ofMinutes = Duration.ofMinutes(5);
+        String minutesExcepted = "5m";
+        String minutesResult = DurationUtil.toHumanReadable(ofMinutes);
+
+        Duration ofHours = Duration.ofHours(10);
+        String hoursExcepted = "10h";
+        String hoursResult = DurationUtil.toHumanReadable(ofHours);
+
+        assertEquals(secondsExcepted, secondsResult);
+        assertEquals(minutesExcepted, minutesResult);
+        assertEquals(hoursExcepted, hoursResult);
+    }
+
+    @Test
+    void testToTicks() {
+        Duration ofSeconds = Duration.ofSeconds(6);
+        long ofSecondsExcepted = 120;
+        long ofSecondsResult = DurationUtil.toTicks(ofSeconds);
+
+        Duration ofMinutes = Duration.ofMinutes(3);
+        long ofMinutesExcepted = 3600;
+        long ofMinutesResult = DurationUtil.toTicks(ofMinutes);
+
+        assertEquals(ofSecondsExcepted, ofSecondsResult);
+        assertEquals(ofMinutesExcepted, ofMinutesResult);
+    }
+}
diff --git a/src/test/java/com/github/imdmk/automessage/util/RandomUtilTest.java b/src/test/java/com/github/imdmk/automessage/util/RandomUtilTest.java
new file mode 100644
index 0000000..0ab45dc
--- /dev/null
+++ b/src/test/java/com/github/imdmk/automessage/util/RandomUtilTest.java
@@ -0,0 +1,20 @@
+package com.github.imdmk.automessage.util;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class RandomUtilTest {
+
+    @Test
+    void testRandom() {
+        List<String> strings = List.of("DMK", "AutoMessage");
+
+        Optional<String> randomString = RandomUtil.getRandom(strings);
+
+        assertTrue(randomString.isPresent());
+    }
+}
diff --git a/src/test/java/com/github/imdmk/automessage/util/StringUtilTest.java b/src/test/java/com/github/imdmk/automessage/util/StringUtilTest.java
new file mode 100644
index 0000000..1eb0bea
--- /dev/null
+++ b/src/test/java/com/github/imdmk/automessage/util/StringUtilTest.java
@@ -0,0 +1,16 @@
+package com.github.imdmk.automessage.util;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class StringUtilTest {
+
+    @Test
+    void isIntegerTest() {
+        String integer = "10";
+        boolean excepted = true;
+
+        assertEquals(excepted, StringUtil.isInteger(integer));
+    }
+}