KTLN-576 Create a List from Kotlin Flow (#1166)

* added unit test

* code changes

* code fixes

* code fixes

---------

Co-authored-by: nappy29 <[email protected]>

Author: naoussi

core-kotlin-modules/core-kotlin-flows/src/test/kotlin/com/baeldung/flowToList/FlowToListUnitTest.kt

@@ -0,0 +1,46 @@
+package com.baeldung.flowToList
+
+import kotlinx.coroutines.flow.*
+import kotlinx.coroutines.test.runTest
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import java.util.concurrent.CopyOnWriteArrayList
+
+class FlowToListUnitTest {
+
+    @Test
+    fun `create list from flow using toList method`() = runTest {
+        val flow = flowOf(1, 2, 3)
+        val result = flow.toList()
+
+        assertEquals(listOf(1, 2, 3), result)
+    }
+
+    @Test
+    fun `create list using toList with custom mutable list`() = runTest {
+        val flow = flowOf(1, 2, 3)
+        val result = CopyOnWriteArrayList<Int>()
+        flow.toList(result)
+
+        assertEquals(listOf(1, 2, 3), result)
+    }
+
+    @Test
+    fun `create list from flow using collect method`() = runTest {
+        val flow = flowOf(1, 2, 3)
+        val result = mutableListOf<Int>()
+        flow.collect { result.add(it) }
+
+        assertEquals(listOf(1, 2, 3), result)
+    }
+
+    @Test
+    fun `create list from flow using fold method`() = runTest {
+        val flow = flowOf(1, 2, 3)
+        val result = flow.fold(mutableListOf<Int>()) { acc, value ->
+            acc.apply { add(value) }
+        }
+        assertEquals(listOf(1, 2, 3), result)
+    }
+
+}