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package scala.util
import org.junit.runner.RunWith
import org.junit.runners.JUnit4
import org.junit.Test
import org.junit.Assert._
@RunWith(classOf[JUnit4])
class SystemPropertiesTest {
@Test
def filterAll(): Unit = {
val isEmpty = sys.props.filter(_ => false).size == 0
assertTrue("A filter matching nothing should produce an empty result", isEmpty)
}
@Test
def filterNone(): Unit = {
val isUnchanged = sys.props.filter(_ => true) == sys.props
assertTrue("A filter matching everything should not change the result", isUnchanged)
}
@Test
def empty(): Unit = {
val hasSize0 = sys.props.empty.size == 0
assertTrue("SystemProperties.empty should have size of 0", hasSize0)
}
}
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