diff --git a/core/src/test/kotlin/org/jetbrains/jewel/BasicJewelUiTest.kt b/core/src/test/kotlin/org/jetbrains/jewel/BasicJewelUiTest.kt
index 64c23eb40..e8bde5213 100644
--- a/core/src/test/kotlin/org/jetbrains/jewel/BasicJewelUiTest.kt
+++ b/core/src/test/kotlin/org/jetbrains/jewel/BasicJewelUiTest.kt
@@ -7,16 +7,19 @@ import kotlinx.coroutines.runBlocking
 import org.junit.Before
 import org.junit.Rule
 
-abstract class BasicJewelUiTest {
+open class BasicJewelUiTest {
 
     @get:Rule
     val composeRule = createComposeRule()
 
-    protected fun runComposeTest(composable: @Composable () -> Unit, block: suspend ComposeContentTestRule.() -> Unit) =
-        runBlocking {
-            composeRule.setContent(composable)
-            composeRule.block()
-        }
+    @Suppress("ImplicitUnitReturnType")
+    protected fun runComposeTest(
+        composable: @Composable () -> Unit,
+        block: suspend ComposeContentTestRule.() -> Unit,
+    ) = runBlocking {
+        composeRule.setContent(composable)
+        composeRule.block()
+    }
 
     @Before
     fun setUpProperties() {
diff --git a/core/src/test/kotlin/org/jetbrains/jewel/PainterHintTest.kt b/core/src/test/kotlin/org/jetbrains/jewel/PainterHintTest.kt
index 10045234f..ec4ab43ca 100644
--- a/core/src/test/kotlin/org/jetbrains/jewel/PainterHintTest.kt
+++ b/core/src/test/kotlin/org/jetbrains/jewel/PainterHintTest.kt
@@ -9,6 +9,7 @@ import org.jetbrains.jewel.painter.rememberResourcePainterProvider
 import org.junit.Assert
 import org.junit.Test
 
+@Suppress("ImplicitUnitReturnType")
 class PainterHintTest : BasicJewelUiTest() {
 
     @Test