add tests

gradle/libs.versions.toml

@@ -7,6 +7,7 @@ log4j = "2.24.1"
 javacord = "3.8.0"
 discord4j = "3.2.7"
 geantyref = "2.0.0"
+mockito = "5.15.2"
 
 [libraries]
 junit-jupiter = { module = "org.junit.jupiter:junit-jupiter", version.ref = "junit-jupiter" }
@@ -14,3 +15,4 @@ log4j = { module = "org.apache.logging.log4j:log4j-api", version.ref = "log4j"}
 javacord = { module = "org.javacord:javacord", version.ref = "javacord"}
 discord4j = { module = "com.discord4j:discord4j-core", version.ref = "discord4j"}
 geantyref = { module = "io.leangen.geantyref:geantyref", version.ref = "geantyref"}
+mockito = {module = "org.mockito:mockito-core", version.ref = "mockito"}