package scala.runtime

import org.junit.Assert._
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4

/** Tests for the runtime object ScalaRunTime */
@RunWith(classOf[JUnit4])
class ScalaRunTimeTest {
  @Test
  def testStringOf() {
    import ScalaRunTime.stringOf
    import scala.collection._

    assertEquals("null", stringOf(null))
    assertEquals( "\"\"", stringOf(""))

    assertEquals("abc", stringOf("abc"))
    assertEquals("\" abc\"", stringOf(" abc"))
    assertEquals("\"abc \"", stringOf("abc "))

    assertEquals("""Array()""", stringOf(Array.empty[AnyRef]))
    assertEquals("""Array()""", stringOf(Array.empty[Int]))
    assertEquals("""Array(1, 2, 3)""", stringOf(Array(1, 2, 3)))
    assertEquals("""Array(a, "", " c", null)""", stringOf(Array("a", "", " c", null)))
    assertEquals("""Array(Array("", 1, Array(5)), Array(1))""",
        stringOf(Array(Array("", 1, Array(5)), Array(1))))

    val map = Map(1->"", 2->"a", 3->" a", 4->null)
    assertEquals(s"""${map.stringPrefix}(1 -> "", 2 -> a, 3 -> " a", 4 -> null)""", stringOf(map))
    assertEquals(s"""${map.stringPrefix}(1 -> "", 2 -> a)""", stringOf(map, 2))

    val iterable = Iterable("a", "", " c", null)
    assertEquals(s"""${iterable.stringPrefix}(a, "", " c", null)""", stringOf(iterable))
    assertEquals(s"""${iterable.stringPrefix}(a, "")""", stringOf(iterable, 2))

    val traversable = new Traversable[Int] {
       def foreach[U](f: Int => U): Unit = (0 to 3).foreach(f)
    }
    assertEquals(s"${traversable.stringPrefix}(0, 1, 2, 3)", stringOf(traversable))
    assertEquals(s"${traversable.stringPrefix}(0, 1)", stringOf(traversable, 2))

    val tuple1 = Tuple1(0)
    assertEquals("(0,)", stringOf(tuple1))
    assertEquals("(0,)", stringOf(tuple1, 0))
    assertEquals("(Array(0),)", stringOf(Tuple1(Array(0))))

    val tuple2 = Tuple2(0, 1)
    assertEquals("(0,1)", stringOf(tuple2))
    assertEquals("(0,1)", stringOf(tuple2, 0))
    assertEquals("(Array(0),1)", stringOf((Array(0), 1)))

    val tuple3 = Tuple3(0, 1, 2)
    assertEquals("(0,1,2)", stringOf(tuple3))
    assertEquals("(0,1,2)", stringOf(tuple3, 0))
    assertEquals("(Array(0),1,2)", stringOf((Array(0), 1, 2)))

    val x = new Object {
        override def toString(): String = "this is the stringOf string"
    }
    assertEquals(stringOf(x), "this is the stringOf string")
    assertEquals(stringOf(x, 2), "this is the stringOf string")
  }
}
