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kotlinlang

I see that one can test for the presence of a plugin with

```    fun testCompression() =
        testApplication {
            application {
                assertThat(pluginOrNull(Compression)).isNotNull()
            }
        }```
How does one access the configuration properties of the plugin?

There is no api to get the configuration of a plugin. It’s up to the plugin author how to handle the configuration. Some plugins do not even need to store the configuration. 

So, only the public members of the plugin class are visible.