diff --git a/akka-stream-tests/src/test/java/akka/stream/javadsl/SourceRunWithTest.java b/akka-stream-tests/src/test/java/akka/stream/javadsl/SourceRunWithTest.java
new file mode 100644
index 0000000000..235298ab2e
--- /dev/null
+++ b/akka-stream-tests/src/test/java/akka/stream/javadsl/SourceRunWithTest.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2009-2019 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+package akka.stream.javadsl;
+
+import akka.actor.ActorSystem;
+import akka.stream.Materializer;
+
+import java.util.concurrent.CompletableFuture;
+
+public class SourceRunWithTest {
+
+  public void sourceRunWithCompileOnlyTest() {
+    Materializer mat = null;
+    ActorSystem system = null;
+
+    // Coverage for #27944
+    Source.<String>empty().runWith(Sink.seq(), mat);
+    Source.<String>empty().runWith(Sink.seq(), system);
+
+    Source.<Long>empty().runFold(0L, (n, acc) -> n + acc, mat);
+    Source.<Long>empty().runFold(0L, (n, acc) -> n + acc, system);
+
+    Source.<Long>empty()
+        .runFoldAsync(0L, (n, acc) -> CompletableFuture.completedFuture(n + acc), mat);
+    Source.<Long>empty()
+        .runFoldAsync(0L, (n, acc) -> CompletableFuture.completedFuture(n + acc), system);
+
+    Source.<String>empty().runReduce((a, b) -> a + b, mat);
+    Source.<String>empty().runReduce((a, b) -> a + b, system);
+
+    Source.<String>empty().runForeach(str -> System.out.println(str), mat);
+    Source.<String>empty().runForeach(str -> System.out.println(str), system);
+  }
+}