src/test/groovy/bugs/Groovy9217.groovy

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package groovy.bugs

import groovy.transform.CompileStatic
import org.junit.Test

// TODO: add JVM option `--illegal-access=deny` when all warnings fixed
@CompileStatic
final class Groovy9217 {

    @Test
    void testSetProperty() {
        def conn = new URL('http://www.bing.com').openConnection() as HttpURLConnection
        try {
            conn.requestMethod = 'HEAD'
            assert 'HEAD' == conn.requestMethod
        } finally {
            conn.disconnect()
        }
    }
}