Ilya Gorbunov
63 lines
1.7 KiB
Kotlin
63 lines
1.7 KiB
Kotlin
package test.properties.delegation
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import org.junit.Test
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import kotlin.test.*
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import kotlin.properties.*
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class NotNullVarTest() {
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@Test fun doTest() {
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NotNullVarTestGeneric("a", "b").doTest()
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}
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}
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private class NotNullVarTestGeneric<T : Any>(val a1: String, val b1: T) {
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var a: String by Delegates.notNull()
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var b by Delegates.notNull<T>()
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public fun doTest() {
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a = a1
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b = b1
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assertTrue(a == "a", "fail: a should be a, but was $a")
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assertTrue(b == "b", "fail: b should be b, but was $b")
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}
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}
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class ObservablePropertyTest {
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var result = false
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var b: Int by Delegates.observable(1, { property, old, new ->
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assertEquals("b", property.name)
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if (!result) assertEquals(1, old)
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result = true
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assertEquals(new, b, "New value has already been set")
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})
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@Test fun doTest() {
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b = 4
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assertTrue(b == 4, "fail: b != 4")
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assertTrue(result, "fail: result should be true")
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}
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}
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class A(val p: Boolean)
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class VetoablePropertyTest {
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var result = false
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var b: A by Delegates.vetoable(A(true), { property, old, new ->
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assertEquals("b", property.name)
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assertEquals(old, b, "New value hasn't been set yet")
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result = new.p == true;
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result
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})
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@Test fun doTest() {
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val firstValue = A(true)
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b = firstValue
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assertTrue(b == firstValue, "fail1: b should be firstValue = A(true)")
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assertTrue(result, "fail2: result should be true")
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b = A(false)
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assertTrue(b == firstValue, "fail3: b should be firstValue = A(true)")
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assertFalse(result, "fail4: result should be false")
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}
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}
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