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/*
* Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
* that can be found in the license/LICENSE.txt file.
*/
package test.properties.delegation.lazy
import kotlin.test.*
class LazyValTest {
var result = 0
val a by lazy {
++result
}
@Test fun doTest() {
a
assertTrue(a == 1, "fail: initializer should be invoked only once")
}
}
class UnsafeLazyValTest {
var result = 0
val a by lazy(LazyThreadSafetyMode.NONE) {
++result
}
@Test fun doTest() {
a
assertTrue(a == 1, "fail: initializer should be invoked only once")
}
}
class NullableLazyValTest {
var resultA = 0
var resultB = 0
val a: Int? by lazy { resultA++; null}
val b by lazy { foo() }
@Test fun doTest() {
a
b
assertTrue(a == null, "fail: a should be null")
assertTrue(b == null, "fail: b should be null")
assertTrue(resultA == 1, "fail: initializer for a should be invoked only once")
assertTrue(resultB == 1, "fail: initializer for b should be invoked only once")
}
fun foo(): String? {
resultB++
return null
}
}
class UnsafeNullableLazyValTest {
var resultA = 0
var resultB = 0
val a: Int? by lazy(LazyThreadSafetyMode.NONE) { resultA++; null}
val b by lazy(LazyThreadSafetyMode.NONE) { foo() }
@Test fun doTest() {
a
b
assertTrue(a == null, "fail: a should be null")
assertTrue(b == null, "fail: a should be null")
assertTrue(resultA == 1, "fail: initializer for a should be invoked only once")
assertTrue(resultB == 1, "fail: initializer for b should be invoked only once")
}
fun foo(): String? {
resultB++
return null
}
}
class IdentityEqualsIsUsedToUnescapeLazyValTest {
var equalsCalled = 0
private val a by lazy { ClassWithCustomEquality { equalsCalled++ } }
@Test fun doTest() {
a
a
assertTrue(equalsCalled == 0, "fail: equals called $equalsCalled times.")
}
}
private class ClassWithCustomEquality(private val onEqualsCalled: () -> Unit) {
override fun equals(other: Any?): Boolean {
onEqualsCalled()
return super.equals(other)
}
}
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