ppkarwasz commented on issue #3011:
URL:
https://github.com/apache/logging-log4j2/issues/3011#issuecomment-2593440525
What you want to test is the behavior of the `Builder` class. Since
`HttpAppenderTest` is a heavy test that starts up an HTTP server, I would
rather create a new `HttpAppenderBuilderTest` to test the builder.
The builder needs to test that the required properties (`name`, `url` and
`layout`) are present, before creating the appender. So, for example, you could
test that:
```java
HttpAppender.newBuilder()
.setName("HTTP")
.setUrl(new URL("https://localhost";))
.build();
```
returns `null` and logs an `ERROR` status logger message. To capture the
status logger messages for a test case, we have an `@UsingStatusListener`
annotation that injects a `ListStatusListener` into the test parameters. The
`@UsingStatusListener` annotation is for example used here.
https://github.com/apache/logging-log4j2/blob/6e3f2e23437d2876f5db2b72bd82b8a34a61b285/log4j-core-test/src/test/java/org/apache/logging/log4j/core/pattern/HighlightConverterTest.java#L195-L211
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