Added code sample and unit tests for any, none and all methods (#812)

Author: yadavan88

core-kotlin-modules/core-kotlin-collections-5/src/test/kotlin/com/baeldung/anyNoneAll/AnyNoneAllUnitTest.kt

@@ -0,0 +1,85 @@
+package com.baeldung.anyNoneAll
+
+import org.junit.Test
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+
+class AnyNoneAllUnitTest {
+    @Test
+    fun `check if no element matches the condition using none`() {
+        val numbers = listOf(1, 2, 3, 4, 5)
+        val noZeroes = numbers.none { it == 0 }
+        assertTrue(noZeroes)
+    }
+
+    @Test
+    fun `none on empty list returns true`() {
+        val numbers: List<Int> = listOf()
+        val noZeroes = numbers.none { it == 0 }
+        assertTrue(noZeroes)
+    }
+
+    @Test
+    fun `check if atleast one element matches the condition using any`() {
+        val numbers = listOf(1, 2, 3, 4, 5, 6)
+        val hasEven = numbers.any { it % 2 == 0 }
+        assertTrue(hasEven)
+    }
+
+    @Test
+    fun `return false if no element matches predicate in any`() {
+        val numbers = listOf(1, 2, 3, 4, 5, 6)
+        val has100plus = numbers.any { it > 100 }
+        assertFalse(has100plus)
+    }
+
+    @Test
+    fun `any on empty list returns false`() {
+        val numbers: List<Int> = listOf()
+        val hasAnyZeroes = numbers.any { it == 0 }
+        assertFalse(hasAnyZeroes)
+    }
+
+    @Test
+    fun `check if all elements matches predicate in all`() {
+        val numbers = listOf(1, 2, 3, 4, 5, 6)
+        val allPositive = numbers.all { it > 0 }
+        assertTrue(allPositive)
+    }
+
+    @Test
+    fun `return false if atleast one doesnt match predicate in all`() {
+        val numbers = listOf(1, 2, 3, 4, 5, 6)
+        val noMultipleOf5 = numbers.all { it % 5 != 0 }
+        assertFalse(noMultipleOf5)
+    }
+
+    @Test
+    fun `all on empty list returns true (Vacuous truth)`() {
+        val numbers: List<Int> = listOf()
+        val hasAnyZeroes = numbers.all { it != 0 }
+        assertTrue(hasAnyZeroes)
+    }
+
+    @Test
+    fun `check handling of null elements in any`() {
+        val numbers = listOf(1, 2, null, 4, 5)
+        val hasNull = numbers.any { it == null }
+        assertTrue(hasNull)
+    }
+
+    @Test
+    fun `check handling of null elements in none`() {
+        val numbers = listOf(1, 2, null, 4, 5)
+        val hasNull = numbers.none { it == null }
+        assertFalse(hasNull)
+    }
+
+    @Test
+    fun `check handling of null elements in all`() {
+        val numbers: List<Int?> = listOf(null, null, null)
+        val allNull = numbers.all { it == null }
+        assertTrue(allNull)
+    }
+
+}