[GitHub] [beam] lukemin89 commented on a change in pull request #11263: [BEAM-9325] Override proper write method in UnownedOutputStream

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lukemin89 commented on a change in pull request #11263: [BEAM-9325] Override proper write method in UnownedOutputStream
URL: https://github.com/apache/beam/pull/11263#discussion_r400543326
 
 

 ##########
 File path: sdks/java/core/src/test/java/org/apache/beam/sdk/util/UnownedOutputStreamTest.java
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 @@ -53,4 +57,21 @@ public void testClosingThrows() throws Exception {
     expectedException.expectMessage("Caller does not own the underlying");
     os.close();
   }
+
+  @Test
+  public void testWrite() throws IOException {
+    ByteArrayOutputStream expected = new ByteArrayOutputStream();
+    ByteArrayOutputStream actual = new ByteArrayOutputStream();
+    UnownedOutputStream osActual = new UnownedOutputStream(actual);
+
+    writeToBoth(expected, osActual, "Hello World!".getBytes(StandardCharsets.UTF_8));
+    writeToBoth(expected, osActual, "Welcome!".getBytes(StandardCharsets.UTF_8));
+
+    assertArrayEquals(expected.toByteArray(), actual.toByteArray());
+  }
+
+  private static void writeToBoth(OutputStream a, OutputStream b, byte[] data) throws IOException {
+    a.write(data);
+    b.write(data);
 
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