src/test/kotlin/net/pterodactylus/sone/utils/OptionalsTest.kt

   1 package net.pterodactylus.sone.utils
   2
   3 import com.google.common.base.Optional
   4 import org.hamcrest.MatcherAssert.assertThat
   5 import org.hamcrest.Matchers.equalTo
   6 import org.hamcrest.Matchers.nullValue
   7 import org.junit.Test
   8
   9 /**
  10  * Test for [Optional] utils.
  11  */
  12 class OptionalsTest {
  13
  14         @Test
  15         fun `present optional can be transformed with let`() {
  16                 val optional = Optional.of(1)
  17                 assertThat(optional.let { it + 1 }, equalTo(2))
  18         }
  19
  20         @Test
  21         fun `empty optional is transform to null with let`() {
  22                 val optional = Optional.absent<Int>()
  23                 assertThat(optional.let { it + 1 }, nullValue())
  24         }
  25
  26         @Test
  27         fun `1 as optional is correct optional`() {
  28                 val optional = 1.asOptional()
  29                 assertThat(optional.get(), equalTo(1))
  30         }
  31
  32         @Test
  33         fun `null as optional is asent optional`() {
  34                 val optional = null.asOptional()
  35                 assertThat(optional.isPresent, equalTo(false))
  36         }
  37
  38 }