Create Guava optional utility collection

[Sone.git] / src / test / kotlin / net / pterodactylus / sone / utils / OptionalsTest.kt

diff --git a/src/test/kotlin/net/pterodactylus/sone/utils/OptionalsTest.kt b/src/test/kotlin/net/pterodactylus/sone/utils/OptionalsTest.kt
new file mode 100644 (file)
index 0000000..2a49db0
--- /dev/null
+++ b/src/test/kotlin/net/pterodactylus/sone/utils/OptionalsTest.kt
@@ -0,0 +1,38 @@
+package net.pterodactylus.sone.utils
+
+import com.google.common.base.Optional
+import org.hamcrest.MatcherAssert.assertThat
+import org.hamcrest.Matchers.equalTo
+import org.hamcrest.Matchers.nullValue
+import org.junit.Test
+
+/**
+ * Test for [Optional] utils.
+ */
+class OptionalsTest {
+
+       @Test
+       fun `present optional can be transformed with let`() {
+               val optional = Optional.of(1)
+               assertThat(optional.let { it + 1 }, equalTo(2))
+       }
+
+       @Test
+       fun `empty optional is transform to null with let`() {
+               val optional = Optional.absent<Int>()
+               assertThat(optional.let { it + 1 }, nullValue())
+       }
+
+       @Test
+       fun `1 as optional is correct optional`() {
+               val optional = 1.asOptional()
+               assertThat(optional.get(), equalTo(1))
+       }
+
+       @Test
+       fun `null as optional is asent optional`() {
+               val optional = null.asOptional()
+               assertThat(optional.isPresent, equalTo(false))
+       }
+
+}