Ilya Gorbunov
82 lines
2.0 KiB
Kotlin
82 lines
2.0 KiB
Kotlin
package test.collections
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import kotlin.test.*
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import org.junit.Test
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class ListSpecificTest {
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val data = listOf("foo", "bar")
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val empty = listOf<String>()
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@Test
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fun _toString() {
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assertEquals("[foo, bar]", data.toString())
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}
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@Test
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fun tail() {
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val data = listOf("foo", "bar", "whatnot")
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val actual = data.drop(1)
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assertEquals(listOf("bar", "whatnot"), actual)
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}
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@Test
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fun slice() {
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val list = listOf('A', 'B', 'C', 'D')
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// ABCD
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// 0123
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assertEquals(listOf('B', 'C', 'D'), list.slice(1..3))
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assertEquals(listOf('D', 'C', 'B'), list.slice(3 downTo 1))
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val iter = listOf(2, 0, 3)
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assertEquals(listOf('C', 'A', 'D'), list.slice(iter))
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}
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@Test
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fun getOr() {
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expect("foo") { data.get(0) }
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expect("bar") { data.get(1) }
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assertFails { data.get(2) }
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assertFails { data.get(-1) }
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assertFails { empty.get(0) }
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expect("foo") { data.getOrElse(0, {""} )}
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expect("zoo") { data.getOrElse(-1, { "zoo" })}
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expect("zoo") { data.getOrElse(2, { "zoo" })}
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expect("zoo") { empty.getOrElse(0) { "zoo" }}
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expect(null) { empty.getOrNull(0) }
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}
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@Test
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fun lastIndex() {
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assertEquals(-1, empty.lastIndex)
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assertEquals(1, data.lastIndex)
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}
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@Test
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fun indexOfLast() {
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expect(-1) { data.indexOfLast { it.contains("p") } }
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expect(1) { data.indexOfLast { it.length == 3 } }
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expect(-1) { empty.indexOfLast { it.startsWith('f') } }
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}
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@Test
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fun mutableList() {
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val items = listOf("beverage", "location", "name")
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var list = listOf<String>()
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for (item in items) {
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list += item
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}
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assertEquals(3, list.size)
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assertEquals("beverage,location,name", list.joinToString(","))
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}
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@Test
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fun testNullToString() {
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assertEquals("[null]", listOf<String?>(null).toString())
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}
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}
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