Improve AudioRecorderComponent sample test synchronization

Author: shai-almog

maven/core-unittests/src/test/java/com/codename1/samples/AudioRecorderComponentSampleTest.java

@@ -62,7 +62,7 @@ public void onReady(String value, Throwable error) {
         Button acceptButton = findButtonWithText(Display.getInstance().getCurrent(), "Accept");
         assertNotNull(acceptButton);
         implementation.tapComponent(acceptButton);
-        flushSerialCalls();
+        waitForResult(result);
 
         assertTrue(result.completed.get());
         assertNull(result.error.get());
@@ -95,7 +95,7 @@ public void onReady(String value, Throwable error) {
         Sheet sheet = Sheet.getCurrentSheet();
         assertNotNull(sheet);
         sheet.back();
-        flushSerialCalls();
+        waitForResult(result);
 
         assertTrue(result.completed.get());
         assertNull(result.error.get());
@@ -179,6 +179,16 @@ private void createPlaceholderFile(String path) throws IOException {
         }
     }
 
+    private void waitForResult(ResultHolder<?> result) {
+        for (int i = 0; i < 5; i++) {
+            if (result.completed.get()) {
+                return;
+            }
+            flushSerialCalls();
+            com.codename1.ui.DisplayTest.flushEdt();
+        }
+    }
+
     private static class ResultHolder<T> {
         private final AtomicReference<T> value = new AtomicReference<T>();
         private final AtomicReference<Throwable> error = new AtomicReference<Throwable>();