diff --git a/sentry/src/test/java/io/sentry/SentryEndToEndTest.kt b/sentry/src/test/java/io/sentry/SentryEndToEndTest.kt
new file mode 100644
index 0000000000..742f4462b2
--- /dev/null
+++ b/sentry/src/test/java/io/sentry/SentryEndToEndTest.kt
@@ -0,0 +1,113 @@
+package io.sentry
+
+import com.google.common.truth.Truth.assertThat
+import io.sentry.protocol.Message
+import io.sentry.test.MockSentryServer
+import io.sentry.test.event
+import io.sentry.test.hasFlag
+import io.sentry.test.hasMetric
+import io.sentry.test.hasMetricWithAttribute
+import io.sentry.test.initForTest
+import io.sentry.test.metrics
+import io.sentry.test.transaction
+import kotlin.test.AfterTest
+import kotlin.test.Test
+
+/** Reports through the APIs an app uses without integrations, over the real HTTP transport. */
+class SentryEndToEndTest {
+  private val server = MockSentryServer()
+
+  @AfterTest
+  fun teardown() {
+    Sentry.close()
+    server.close()
+  }
+
+  @Test
+  fun `events, a transaction and metrics reach Sentry`() {
+    initForTest {
+      it.dsn = server.dsn
+      it.tracesSampleRate = 1.0
+      it.beforeBreadcrumb = SentryOptions.BeforeBreadcrumbCallback { breadcrumb, _ ->
+        if (breadcrumb.message == "bad breadcrumb") null else breadcrumb
+      }
+    }
+    Sentry.addBreadcrumb("bad breadcrumb")
+    Sentry.configureScope {
+      it.addEventProcessor(
+        object : EventProcessor {
+          override fun process(event: SentryEvent, hint: Hint): SentryEvent = event.apply {
+            if ((level?.ordinal ?: 0) > SentryLevel.INFO.ordinal) {
+              addBreadcrumb(Breadcrumb("Processed by the event processor"))
+            }
+          }
+        }
+      )
+    }
+
+    Sentry.withScope {
+      it.level = SentryLevel.FATAL
+      Sentry.captureMessage("Fatal message!")
+    }
+    Sentry.captureMessage("Some warning!", SentryLevel.WARNING)
+    Sentry.addFeatureFlag("my-feature-flag", true)
+    Sentry.setAttribute("user.type", "admin")
+    Sentry.setAttribute("feature.version", 2)
+    Sentry.metrics().count("countMetric")
+    Sentry.metrics().gauge("gaugeMetric", 5.0)
+    Sentry.metrics().distribution("distributionMetric", 7.0)
+    Sentry.captureException(RuntimeException("Some error!"))
+    Sentry.captureEvent(
+      SentryEvent().apply {
+        message = Message().apply { message = "Detailed event" }
+        fingerprints = listOf("NewClientDebug")
+        level = SentryLevel.DEBUG
+      }
+    )
+    repeat(10) { i ->
+      Sentry.captureEvent(
+        SentryEvent().apply { message = Message().apply { message = "event $i" } }
+      )
+    }
+    val transaction = Sentry.startTransaction("transaction name", "op")
+    transaction.startChild("child").finish()
+    transaction.finish()
+    Sentry.flush(5000)
+
+    val fatal =
+      server.awaitEnvelope { it.event()?.message?.formatted == "Fatal message!" }.event()!!
+    assertThat(fatal.level).isEqualTo(SentryLevel.FATAL)
+    assertThat(fatal.breadcrumbs!!.map { it.message }).contains("Processed by the event processor")
+    assertThat(fatal.breadcrumbs!!.map { it.message }).doesNotContain("bad breadcrumb")
+
+    val warning =
+      server.awaitEnvelope { it.event()?.message?.formatted == "Some warning!" }.event()!!
+    assertThat(warning.level).isEqualTo(SentryLevel.WARNING)
+
+    val error =
+      server
+        .awaitEnvelope { it.event()?.exceptions?.any { e -> e.value == "Some error!" } == true }
+        .event()!!
+    assertThat(error.exceptions!!.map { it.type to it.value })
+      .contains("RuntimeException" to "Some error!")
+    assertThat(error.hasFlag("my-feature-flag", true)).isTrue()
+
+    val detailed =
+      server.awaitEnvelope { it.event()?.message?.message == "Detailed event" }.event()!!
+    assertThat(detailed.fingerprints).containsExactly("NewClientDebug")
+    assertThat(detailed.level).isEqualTo(SentryLevel.DEBUG)
+
+    repeat(10) { i -> server.awaitEnvelope { it.event()?.message?.message == "event $i" } }
+
+    val sent =
+      server.awaitEnvelope { it.transaction()?.transaction == "transaction name" }.transaction()!!
+    assertThat(sent.spans.map { it.op }).contains("child")
+
+    val metrics = server.awaitEnvelope { it.metrics() != null }.metrics()!!
+    assertThat(metrics.hasMetric("countMetric", "counter", 1.0)).isTrue()
+    assertThat(metrics.hasMetric("gaugeMetric", "gauge", 5.0)).isTrue()
+    assertThat(metrics.hasMetric("distributionMetric", "distribution", 7.0)).isTrue()
+    assertThat(metrics.hasMetricWithAttribute("countMetric", "user.type", "admin")).isTrue()
+    assertThat(metrics.hasMetricWithAttribute("countMetric", "feature.version", 2)).isTrue()
+  }
+}