Improve error displayed when the Unconsumed Event cannot be displayed.

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/PresenterTest.kt

@@ -12,6 +12,7 @@ import app.cash.molecule.moleculeFlow
 import app.cash.turbine.TurbineTestContext
 import app.cash.turbine.test
 import io.element.android.libraries.architecture.Presenter
+import org.junit.Assert.fail
 import kotlin.time.Duration
 
 suspend fun <State> Presenter<State>.test(
@@ -19,7 +20,20 @@ suspend fun <State> Presenter<State>.test(
     name: String? = null,
     validate: suspend TurbineTestContext<State>.() -> Unit,
 ) {
-    moleculeFlow(RecompositionMode.Immediate) {
-        present()
-    }.test(timeout, name, validate)
+    try {
+        moleculeFlow(RecompositionMode.Immediate) {
+            present()
+        }.test(timeout, name, validate)
+    } catch (t: Throwable) {
+        if (t::class.simpleName == "KotlinReflectionInternalError") {
+            // Give a more explicit error to the developer
+            fail("""
+                It looks like you have an unconsumed event in your test.
+                    If you get this error, it means that your test is missing to consume one of several events.
+                    You can fix by consuming and check the event with `awaitItem()`, or you can also invoke
+                    `cancelAndIgnoreRemainingEvents()`.
+                """.trimIndent())
+        }
+        throw t
+    }
 }