Convert StateUpdatesTest to Kotlin

Summary: As per title

Reviewed By: fabiocarballo

Differential Revision: D44952337

fbshipit-source-id: 4a1948c181e77c13b6e66fbd1577ca6dbfbb4cac

litho-it/src/test/java/com/facebook/litho/BUCK

@@ -123,10 +123,9 @@ litho_robolectric4_test(
 litho_android_library(
     name = "testutil",
     srcs = [
-        "StateUpdateTestComponent.java",
+        "StateUpdateTestComponent.kt",
     ],
     autoglob = False,
-    language = "JAVA",
     source = "8",
     target = "8",
     visibility = [

litho-it/src/test/java/com/facebook/litho/StateUpdateTestComponent.kt

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.facebook.litho
+
+import java.util.concurrent.atomic.AtomicInteger
+
+class StateUpdateTestComponent : SpecGeneratedComponent("StateUpdateTest") {
+
+  private val createInitialStateCount = AtomicInteger(0)
+
+  override fun isEquivalentProps(other: Component?, shouldCompareCommonProps: Boolean): Boolean =
+      this === other
+
+  override fun hasState(): Boolean = true
+
+  override fun createInitialState(c: ComponentContext, stateContainer: StateContainer) {
+    val testStateContainer = stateContainer as TestStateContainer
+    testStateContainer.mCount = INITIAL_COUNT_STATE_VALUE
+    createInitialStateCount.incrementAndGet()
+    finalCounterValue.set(INITIAL_COUNT_STATE_VALUE)
+  }
+
+  fun getCount(c: ComponentContext?): Int = finalCounterValue.get()
+
+  val componentForStateUpdate: StateUpdateTestComponent
+    get() = this
+
+  override fun createStateContainer(): StateContainer = TestStateContainer()
+
+  protected fun getStateContainerImpl(c: ComponentContext): TestStateContainer? =
+      c.scopedComponentInfo.stateContainer as TestStateContainer?
+
+  class TestStateContainer : StateContainer() {
+    @JvmField var mCount = 0
+    override fun applyStateUpdate(stateUpdate: StateUpdate) {
+      when (stateUpdate.type) {
+        STATE_UPDATE_TYPE_NOOP -> {}
+        STATE_UPDATE_TYPE_INCREMENT -> mCount += 1
+        STATE_UPDATE_TYPE_MULTIPLY -> mCount *= 2
+      }
+      finalCounterValue.set(mCount)
+    }
+  }
+
+  companion object {
+    private const val STATE_UPDATE_TYPE_NOOP = 0
+    private const val STATE_UPDATE_TYPE_INCREMENT = 1
+    private const val STATE_UPDATE_TYPE_MULTIPLY = 2
+    const val INITIAL_COUNT_STATE_VALUE = 4
+    @JvmStatic
+    fun createNoopStateUpdate(): StateContainer.StateUpdate =
+        StateContainer.StateUpdate(STATE_UPDATE_TYPE_NOOP)
+
+    @JvmStatic
+    fun createIncrementStateUpdate(): StateContainer.StateUpdate =
+        StateContainer.StateUpdate(STATE_UPDATE_TYPE_INCREMENT)
+
+    @JvmStatic
+    fun createMultiplyStateUpdate(): StateContainer.StateUpdate =
+        StateContainer.StateUpdate(STATE_UPDATE_TYPE_MULTIPLY)
+
+    private val idGenerator = AtomicInteger(0)
+    private val finalCounterValue = AtomicInteger(0)
+  }
+}