scala.StringContextTest.scala Maven / Gradle / Ivy

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package scala

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

import scala.tools.testing.AssertUtil._

@RunWith(classOf[JUnit4])
class StringContextTest {

  import StringContext._

  @Test def noEscape() = {
    val s = "string"
    val res = processEscapes(s)
    assertEquals(s, res)
  }
  @Test def tabbed() = {
    val s = """a\tb"""
    val res = processEscapes(s)
    assertEquals("a\tb", res)
  }
  @Test def quoted() = {
    val s = """hello, \"world\""""
    val res = processEscapes(s)
    assertEquals("""hello, "world"""", res)
  }
  @Test def octal() = {
    val s = """\123cala"""
    val res = treatEscapes(s)
    assertEquals("Scala", res)
  }
  @Test def doubled() = {
    val s = """\123cala\123yntax"""
    val res = treatEscapes(s)
    assertEquals("ScalaSyntax", res)
  }
  @Test def badly() = assertThrows[InvalidEscapeException] {
    val s = """Scala\"""
    val res = treatEscapes(s)
    assertEquals("Scala", res)
  }
  @Test def noOctal() = assertThrows[InvalidEscapeException] {
    val s = """\123cala"""
    val res = processEscapes(s)
    assertEquals("Scala", res)
  }

  @Test def t6631_baseline() = assertEquals("\f\r\n\t", s"""\f\r\n\t""")

  @Test def t6631_badEscape() = assertThrows[InvalidEscapeException] {
    s"""\x"""
  }

  // verifying that the standard interpolators can be supplanted
  @Test def antiHijack_?() = {
    object AllYourStringsAreBelongToMe { case class StringContext(args: Any*) { def s(args: Any) = "!!!!" } }
    import AllYourStringsAreBelongToMe._
    //assertEquals("????", s"????")
    assertEquals("!!!!", s"????") // OK to hijack core interpolator ids
  }

  @Test def fIf() = {
    val res = f"${if (true) 2.5 else 2.5}%.2f"
    val expected = formatUsingCurrentLocale(2.50)
    assertEquals(expected, res)
  }

  @Test def fIfNot() = {
    val res = f"${if (false) 2.5 else 3.5}%.2f"
    val expected = formatUsingCurrentLocale(3.50)
    assertEquals(expected, res)
  }

  @Test def fHeteroArgs() = {
    val res = f"${3.14}%.2f rounds to ${3}%d"
    val expected = formatUsingCurrentLocale(3.14) + " rounds to 3"
    assertEquals(expected, res)
  }

  // Use this method to avoid problems with a locale-dependent decimal mark.
  // The string interpolation is not used here intentionally as this method is used to test string interpolation.
  private def formatUsingCurrentLocale(number: Double, decimalPlaces: Int = 2) = ("%." + decimalPlaces + "f").format(number)
}