fix: classloaderの呼び出しを変更

src/test/kotlin/dev/usbharu/hideout/routing/UserRoutingKtTest.kt

@@ -0,0 +1,12 @@
+package dev.usbharu.hideout.routing
+
+import org.junit.jupiter.api.Test
+
+class UserRoutingKtTest {
+    @Test
+    fun userIconTest() {
+        println(String.Companion::class.java.classLoader)
+        println(String::class.java.classLoader)
+        println(String.javaClass.classLoader.getResourceAsStream("icon.png")?.readAllBytes())
+    }
+}