Added tests.

src/test/java/com/github/imdmk/automessage/NotificationFormatterTest.java

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+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);
+    }
+}

src/test/java/com/github/imdmk/automessage/util/ComponentUtilTest.java

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+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);
+    }
+}

src/test/java/com/github/imdmk/automessage/util/DurationUtilTest.java

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+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);
+    }
+}

src/test/java/com/github/imdmk/automessage/util/RandomUtilTest.java

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+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());
+    }
+}

src/test/java/com/github/imdmk/automessage/util/StringUtilTest.java

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+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));
+    }
+}