diff --git a/build.gradle.kts b/build.gradle.kts
index 1c96989a..b72caa33 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -32,6 +32,11 @@ tasks.withType<Test> {
     val cpus = Runtime.getRuntime().availableProcessors()
     maxParallelForks = max(1, cpus - 1)
     setForkEvery(4)
+    doFirst {
+        jvmArgs = arrayOf(
+            "--add-opens", "java.base/java.lang=ALL-UNNAMED"
+        ).toMutableList()
+    }
 }
 
 tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompilationTask<*>>().configureEach {
@@ -160,7 +165,8 @@ dependencies {
     testImplementation("org.junit.jupiter:junit-jupiter:5.8.1")
     testImplementation("org.mockito.kotlin:mockito-kotlin:4.1.0")
     testImplementation("org.mockito:mockito-inline:5.2.0")
-
+    testImplementation("nl.jqno.equalsverifier:equalsverifier:3.15.3")
+    testImplementation("com.jparams:to-string-verifier:1.4.8")
 
     implementation("org.drewcarlson:kjob-core:0.6.0")
     implementation("org.drewcarlson:kjob-mongo:0.6.0")
diff --git a/src/test/kotlin/dev/usbharu/hideout/EqualsAndToStringTest.kt b/src/test/kotlin/dev/usbharu/hideout/EqualsAndToStringTest.kt
new file mode 100644
index 00000000..62f68093
--- /dev/null
+++ b/src/test/kotlin/dev/usbharu/hideout/EqualsAndToStringTest.kt
@@ -0,0 +1,42 @@
+package dev.usbharu.hideout
+
+import com.jparams.verifier.tostring.ToStringVerifier
+import nl.jqno.equalsverifier.EqualsVerifier
+import nl.jqno.equalsverifier.Warning
+import nl.jqno.equalsverifier.internal.reflection.PackageScanner
+import org.junit.jupiter.api.Test
+import java.lang.reflect.Modifier
+import kotlin.test.assertFails
+
+class EqualsAndToStringTest {
+    @Test
+    fun equalsTest() {
+        assertFails {
+            EqualsVerifier
+                .simple()
+                .suppress(Warning.INHERITED_DIRECTLY_FROM_OBJECT)
+                .forPackage("dev.usbharu.hideout", true)
+                .verify()
+        }
+    }
+
+    @Test
+    fun toStringTest() {
+
+        PackageScanner.getClassesIn("dev.usbharu.hideout", null, true)
+            .filter {
+                it != null && !it.isEnum && !it.isInterface && !Modifier.isAbstract(it.modifiers)
+            }
+            .forEach {
+                try {
+                    ToStringVerifier.forClass(it).verify()
+                } catch (e: AssertionError) {
+                    println(it.name)
+                    e.printStackTrace()
+                } catch (e: Exception) {
+                    println(it.name)
+                    e.printStackTrace()
+                }
+            }
+    }
+}