msfroh commented on code in PR #16173:
URL: https://github.com/apache/lucene/pull/16173#discussion_r3724464568
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lucene/core/src/test/org/apache/lucene/store/TestFilterDirectory.java:
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@@ -45,6 +42,21 @@ public void testOverrides() throws Exception {
}
}
+ public void testCopyFromDelegates() throws IOException {
Review Comment:
You could try:
```
try (Directory srcDir = new ByteBuffersDirectory();
Directory destDir = new ByteBuffersDirectory()) {
try (IndexOutput out = srcDir.createOutput("test.txt",
IOContext.DEFAULT)) {
out.writeString("hello");
}
boolean[] delegated = {false};
FilterDirectory wrappedDestDir = new FilterDirectory(destDir) {
@Override
public void copyFrom(Directory from, String src, String dest,
IOContext context) throws IOException {
delegated[0] = true;
in.copyFrom(from, src, dest, context);
}
};
FilterDirectory filterDestDir = new FilterDirectory(wrappedDestDir) {};
filterDestDir.copyFrom(srcDir, "test.txt", "copied.txt",
IOContext.DEFAULT);
assertTrue(delegated[0]);
assertTrue(slowFileExists(destDir, "copied.txt"));
try (IndexInput in = destDir.openInput("copied.txt",
IOContext.DEFAULT)) {
assertEquals("hello", in.readString());
}
}
```
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