Move all files to natural position.

app/src/test/java/org/thoughtcrime/securesms/testutil/DirectExecutor.java

@@ -0,0 +1,16 @@
+package org.thoughtcrime.securesms.testutil;
+
+import androidx.annotation.NonNull;
+
+import java.util.concurrent.Executor;
+
+/**
+ * Executor that runs runnables on the same thread {@link #execute(Runnable)} is invoked on.
+ * Only intended to be used for tests.
+ */
+public class DirectExecutor implements Executor {
+  @Override
+  public void execute(@NonNull Runnable runnable) {
+    runnable.run();
+  }
+}